<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html xmlns:fn="http://www.w3.org/2005/02/xpath-functions"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link rel="stylesheet" href="../../../../doc/otp_doc.css" type="text/css"> <title>Erlang -- dets</title> </head> <body bgcolor="white" text="#000000" link="#0000ff" vlink="#ff00ff" alink="#ff0000"><div id="container"> <script id="js" type="text/javascript" language="JavaScript" src="../../../../doc/js/flipmenu/flipmenu.js"></script><script id="js2" type="text/javascript" src="../../../../doc/js/erlresolvelinks.js"></script><script language="JavaScript" type="text/javascript"> <!-- function getWinHeight() { var myHeight = 0; if( typeof( window.innerHeight ) == 'number' ) { //Non-IE myHeight = window.innerHeight; } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) { //IE 6+ in 'standards compliant mode' myHeight = 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href="../../../../doc/index.html">Top</a></small><p><strong>STDLIB</strong><br><strong>Reference Manual</strong><br><small>Version 1.16.5</small></p> <br><a href="javascript:openAllFlips()">Expand All</a><br><a href="javascript:closeAllFlips()">Contract All</a><p><small><strong>Table of Contents</strong></small></p> <ul class="flipMenu"> <li title="STDLIB (App)"><a href="STDLIB_app.html">STDLIB (App) </a></li> <li id="no" title="array " expanded="false">array<ul> <li><a href="array.html"> Top of manual page </a></li> <li title="default-1"><a href="array.html#default-1">default/1</a></li> <li title="fix-1"><a href="array.html#fix-1">fix/1</a></li> <li title="foldl-3"><a href="array.html#foldl-3">foldl/3</a></li> <li title="foldr-3"><a href="array.html#foldr-3">foldr/3</a></li> <li title="from_list-1"><a href="array.html#from_list-1">from_list/1</a></li> <li title="from_list-2"><a href="array.html#from_list-2">from_list/2</a></li> <li title="from_orddict-1"><a href="array.html#from_orddict-1">from_orddict/1</a></li> <li title="from_orddict-2"><a href="array.html#from_orddict-2">from_orddict/2</a></li> <li title="get-2"><a href="array.html#get-2">get/2</a></li> <li title="is_array-1"><a href="array.html#is_array-1">is_array/1</a></li> <li title="is_fix-1"><a href="array.html#is_fix-1">is_fix/1</a></li> <li title="map-2"><a href="array.html#map-2">map/2</a></li> <li title="new-0"><a href="array.html#new-0">new/0</a></li> <li title="new-1"><a href="array.html#new-1">new/1</a></li> <li title="new-2"><a href="array.html#new-2">new/2</a></li> <li title="relax-1"><a href="array.html#relax-1">relax/1</a></li> <li title="reset-2"><a href="array.html#reset-2">reset/2</a></li> <li title="resize-1"><a href="array.html#resize-1">resize/1</a></li> <li title="resize-2"><a href="array.html#resize-2">resize/2</a></li> <li title="set-3"><a href="array.html#set-3">set/3</a></li> <li title="size-1"><a href="array.html#size-1">size/1</a></li> <li title="sparse_foldl-3"><a href="array.html#sparse_foldl-3">sparse_foldl/3</a></li> <li title="sparse_foldr-3"><a href="array.html#sparse_foldr-3">sparse_foldr/3</a></li> <li title="sparse_map-2"><a href="array.html#sparse_map-2">sparse_map/2</a></li> <li title="sparse_size-1"><a href="array.html#sparse_size-1">sparse_size/1</a></li> <li title="sparse_to_list-1"><a href="array.html#sparse_to_list-1">sparse_to_list/1</a></li> <li title="sparse_to_orddict-1"><a href="array.html#sparse_to_orddict-1">sparse_to_orddict/1</a></li> <li title="to_list-1"><a href="array.html#to_list-1">to_list/1</a></li> <li title="to_orddict-1"><a href="array.html#to_orddict-1">to_orddict/1</a></li> </ul> </li> <li id="no" title="base64 " expanded="false">base64<ul> <li><a href="base64.html"> Top of manual page </a></li> <li title="encode-1"><a href="base64.html#encode-1">encode/1</a></li> <li title="encode_to_string-1"><a href="base64.html#encode_to_string-1">encode_to_string/1</a></li> <li title="decode-1"><a href="base64.html#decode-1">decode/1</a></li> <li title="decode_to_string-1"><a href="base64.html#decode_to_string-1">decode_to_string/1</a></li> <li title="mime_decode-1"><a href="base64.html#mime_decode-1">mime_decode/1</a></li> <li title="mime_decode_to_string-1"><a href="base64.html#mime_decode_to_string-1">mime_decode_to_string/1</a></li> </ul> </li> <li id="no" title="beam_lib " expanded="false">beam_lib<ul> <li><a href="beam_lib.html"> Top of manual page </a></li> <li title="chunks-2"><a href="beam_lib.html#chunks-2">chunks/2</a></li> <li title="chunks-3"><a href="beam_lib.html#chunks-3">chunks/3</a></li> <li title="version-1"><a href="beam_lib.html#version-1">version/1</a></li> <li title="md5-1"><a href="beam_lib.html#md5-1">md5/1</a></li> <li title="info-1"><a href="beam_lib.html#info-1">info/1</a></li> <li title="cmp-2"><a href="beam_lib.html#cmp-2">cmp/2</a></li> <li title="cmp_dirs-2"><a href="beam_lib.html#cmp_dirs-2">cmp_dirs/2</a></li> <li title="diff_dirs-2"><a href="beam_lib.html#diff_dirs-2">diff_dirs/2</a></li> <li title="strip-1"><a href="beam_lib.html#strip-1">strip/1</a></li> <li title="strip_files-1"><a href="beam_lib.html#strip_files-1">strip_files/1</a></li> <li title="strip_release-1"><a href="beam_lib.html#strip_release-1">strip_release/1</a></li> <li title="format_error-1"><a href="beam_lib.html#format_error-1">format_error/1</a></li> <li title="crypto_key_fun-1"><a href="beam_lib.html#crypto_key_fun-1">crypto_key_fun/1</a></li> <li title="clear_crypto_key_fun-0"><a href="beam_lib.html#clear_crypto_key_fun-0">clear_crypto_key_fun/0</a></li> </ul> </li> <li id="no" title="c " expanded="false">c<ul> <li><a href="c.html"> Top of manual page </a></li> <li title="bt-1"><a href="c.html#bt-1">bt/1</a></li> <li title="c-1"><a href="c.html#c-1">c/1</a></li> <li title="c-2"><a href="c.html#c-2">c/2</a></li> <li title="cd-1"><a href="c.html#cd-1">cd/1</a></li> <li title="flush-0"><a href="c.html#flush-0">flush/0</a></li> <li title="help-0"><a href="c.html#help-0">help/0</a></li> <li title="i-0"><a href="c.html#i-0">i/0</a></li> <li title="ni-0"><a href="c.html#ni-0">ni/0</a></li> <li title="i-3"><a href="c.html#i-3">i/3</a></li> <li title="l-1"><a href="c.html#l-1">l/1</a></li> <li title="lc-1"><a href="c.html#lc-1">lc/1</a></li> <li title="ls-0"><a href="c.html#ls-0">ls/0</a></li> <li title="ls-1"><a href="c.html#ls-1">ls/1</a></li> <li title="m-0"><a href="c.html#m-0">m/0</a></li> <li title="m-1"><a href="c.html#m-1">m/1</a></li> <li title="memory-0"><a href="c.html#memory-0">memory/0</a></li> <li title="memory-1"><a href="c.html#memory-1">memory/1</a></li> <li title="memory-1"><a href="c.html#memory-1">memory/1</a></li> <li title="nc-1"><a href="c.html#nc-1">nc/1</a></li> <li title="nc-2"><a href="c.html#nc-2">nc/2</a></li> <li title="nl-1"><a href="c.html#nl-1">nl/1</a></li> <li title="pid-3"><a href="c.html#pid-3">pid/3</a></li> <li title="pwd-0"><a href="c.html#pwd-0">pwd/0</a></li> <li title="q-0"><a href="c.html#q-0">q/0</a></li> <li title="regs-0"><a href="c.html#regs-0">regs/0</a></li> <li title="nregs-0"><a href="c.html#nregs-0">nregs/0</a></li> <li title="xm-1"><a href="c.html#xm-1">xm/1</a></li> <li title="y-1"><a href="c.html#y-1">y/1</a></li> <li title="y-2"><a href="c.html#y-2">y/2</a></li> </ul> </li> <li id="no" title="calendar " expanded="false">calendar<ul> <li><a href="calendar.html"> Top of manual page </a></li> <li title="date_to_gregorian_days-1"><a href="calendar.html#date_to_gregorian_days-1">date_to_gregorian_days/1</a></li> <li title="date_to_gregorian_days-3"><a href="calendar.html#date_to_gregorian_days-3">date_to_gregorian_days/3</a></li> <li title="datetime_to_gregorian_seconds-1"><a href="calendar.html#datetime_to_gregorian_seconds-1">datetime_to_gregorian_seconds/1</a></li> <li title="day_of_the_week-1"><a href="calendar.html#day_of_the_week-1">day_of_the_week/1</a></li> <li title="day_of_the_week-3"><a href="calendar.html#day_of_the_week-3">day_of_the_week/3</a></li> <li title="gregorian_days_to_date-1"><a href="calendar.html#gregorian_days_to_date-1">gregorian_days_to_date/1</a></li> <li title="gregorian_seconds_to_datetime-1"><a href="calendar.html#gregorian_seconds_to_datetime-1">gregorian_seconds_to_datetime/1</a></li> <li title="is_leap_year-1"><a href="calendar.html#is_leap_year-1">is_leap_year/1</a></li> <li title="last_day_of_the_month-2"><a href="calendar.html#last_day_of_the_month-2">last_day_of_the_month/2</a></li> <li title="local_time-0"><a href="calendar.html#local_time-0">local_time/0</a></li> <li title="local_time_to_universal_time-1"><a href="calendar.html#local_time_to_universal_time-1">local_time_to_universal_time/1</a></li> <li title="local_time_to_universal_time_dst-1"><a href="calendar.html#local_time_to_universal_time_dst-1">local_time_to_universal_time_dst/1</a></li> <li title="now_to_local_time-1"><a href="calendar.html#now_to_local_time-1">now_to_local_time/1</a></li> <li title="now_to_universal_time-1"><a href="calendar.html#now_to_universal_time-1">now_to_universal_time/1</a></li> <li title="now_to_datetime-1"><a href="calendar.html#now_to_datetime-1">now_to_datetime/1</a></li> <li title="seconds_to_daystime-1"><a href="calendar.html#seconds_to_daystime-1">seconds_to_daystime/1</a></li> <li title="seconds_to_time-1"><a href="calendar.html#seconds_to_time-1">seconds_to_time/1</a></li> <li title="time_difference-2"><a href="calendar.html#time_difference-2">time_difference/2</a></li> <li title="time_to_seconds-1"><a href="calendar.html#time_to_seconds-1">time_to_seconds/1</a></li> <li title="universal_time-0"><a href="calendar.html#universal_time-0">universal_time/0</a></li> <li title="universal_time_to_local_time-1"><a href="calendar.html#universal_time_to_local_time-1">universal_time_to_local_time/1</a></li> <li title="valid_date-1"><a href="calendar.html#valid_date-1">valid_date/1</a></li> <li title="valid_date-3"><a href="calendar.html#valid_date-3">valid_date/3</a></li> </ul> </li> <li id="loadscrollpos" title="dets " expanded="true">dets<ul> <li><a href="dets.html"> Top of manual page </a></li> <li title="all-0"><a href="dets.html#all-0">all/0</a></li> <li title="bchunk-2"><a href="dets.html#bchunk-2">bchunk/2</a></li> <li title="close-1"><a href="dets.html#close-1">close/1</a></li> <li title="delete-2"><a href="dets.html#delete-2">delete/2</a></li> <li title="delete_all_objects-1"><a href="dets.html#delete_all_objects-1">delete_all_objects/1</a></li> <li title="delete_object-2"><a href="dets.html#delete_object-2">delete_object/2</a></li> <li title="first-1"><a href="dets.html#first-1">first/1</a></li> <li title="foldl-3"><a href="dets.html#foldl-3">foldl/3</a></li> <li title="foldr-3"><a href="dets.html#foldr-3">foldr/3</a></li> <li title="from_ets-2"><a href="dets.html#from_ets-2">from_ets/2</a></li> <li title="info-1"><a href="dets.html#info-1">info/1</a></li> <li title="info-2"><a href="dets.html#info-2">info/2</a></li> <li title="init_table-2"><a href="dets.html#init_table-2">init_table/2</a></li> <li title="insert-2"><a href="dets.html#insert-2">insert/2</a></li> <li title="insert_new-2"><a href="dets.html#insert_new-2">insert_new/2</a></li> <li title="is_compatible_bchunk_format-2"><a href="dets.html#is_compatible_bchunk_format-2">is_compatible_bchunk_format/2</a></li> <li title="is_dets_file-1"><a href="dets.html#is_dets_file-1">is_dets_file/1</a></li> <li title="lookup-2"><a href="dets.html#lookup-2">lookup/2</a></li> <li title="match-1"><a href="dets.html#match-1">match/1</a></li> <li title="match-2"><a href="dets.html#match-2">match/2</a></li> <li title="match-3"><a href="dets.html#match-3">match/3</a></li> <li title="match_delete-2"><a href="dets.html#match_delete-2">match_delete/2</a></li> <li title="match_object-1"><a href="dets.html#match_object-1">match_object/1</a></li> <li title="match_object-2"><a href="dets.html#match_object-2">match_object/2</a></li> <li title="match_object-3"><a href="dets.html#match_object-3">match_object/3</a></li> <li title="member-2"><a href="dets.html#member-2">member/2</a></li> <li title="next-2"><a href="dets.html#next-2">next/2</a></li> <li title="open_file-1"><a href="dets.html#open_file-1">open_file/1</a></li> <li title="open_file-2"><a href="dets.html#open_file-2">open_file/2</a></li> <li title="pid2name-1"><a href="dets.html#pid2name-1">pid2name/1</a></li> <li title="repair_continuation-2"><a href="dets.html#repair_continuation-2">repair_continuation/2</a></li> <li title="safe_fixtable-2"><a href="dets.html#safe_fixtable-2">safe_fixtable/2</a></li> <li title="select-1"><a href="dets.html#select-1">select/1</a></li> <li title="select-2"><a href="dets.html#select-2">select/2</a></li> <li title="select-3"><a href="dets.html#select-3">select/3</a></li> <li title="select_delete-2"><a href="dets.html#select_delete-2">select_delete/2</a></li> <li title="slot-2"><a href="dets.html#slot-2">slot/2</a></li> <li title="sync-1"><a href="dets.html#sync-1">sync/1</a></li> <li title="table-1"><a href="dets.html#table-1">table/1</a></li> <li title="to_ets-2"><a href="dets.html#to_ets-2">to_ets/2</a></li> <li title="traverse-2"><a href="dets.html#traverse-2">traverse/2</a></li> <li title="update_counter-3"><a href="dets.html#update_counter-3">update_counter/3</a></li> </ul> </li> <li id="no" title="dict " expanded="false">dict<ul> <li><a href="dict.html"> Top of manual page </a></li> <li title="append-3"><a href="dict.html#append-3">append/3</a></li> <li title="append_list-3"><a href="dict.html#append_list-3">append_list/3</a></li> <li title="erase-2"><a href="dict.html#erase-2">erase/2</a></li> <li title="fetch-2"><a href="dict.html#fetch-2">fetch/2</a></li> <li title="fetch_keys-1"><a href="dict.html#fetch_keys-1">fetch_keys/1</a></li> <li title="filter-2"><a href="dict.html#filter-2">filter/2</a></li> <li title="find-2"><a href="dict.html#find-2">find/2</a></li> <li title="fold-3"><a href="dict.html#fold-3">fold/3</a></li> <li title="from_list-1"><a href="dict.html#from_list-1">from_list/1</a></li> <li title="is_key-2"><a href="dict.html#is_key-2">is_key/2</a></li> <li title="map-2"><a href="dict.html#map-2">map/2</a></li> <li title="merge-3"><a href="dict.html#merge-3">merge/3</a></li> <li title="new-0"><a href="dict.html#new-0">new/0</a></li> <li title="size-1"><a href="dict.html#size-1">size/1</a></li> <li title="store-3"><a href="dict.html#store-3">store/3</a></li> <li title="to_list-1"><a href="dict.html#to_list-1">to_list/1</a></li> <li title="update-3"><a href="dict.html#update-3">update/3</a></li> <li title="update-4"><a href="dict.html#update-4">update/4</a></li> <li title="update_counter-3"><a href="dict.html#update_counter-3">update_counter/3</a></li> </ul> </li> <li id="no" title="digraph " expanded="false">digraph<ul> <li><a href="digraph.html"> Top of manual page </a></li> <li title="add_edge-5"><a href="digraph.html#add_edge-5">add_edge/5</a></li> <li title="add_edge-4"><a href="digraph.html#add_edge-4">add_edge/4</a></li> <li title="add_edge-3"><a href="digraph.html#add_edge-3">add_edge/3</a></li> <li title="add_vertex-3"><a href="digraph.html#add_vertex-3">add_vertex/3</a></li> <li title="add_vertex-2"><a href="digraph.html#add_vertex-2">add_vertex/2</a></li> <li title="add_vertex-1"><a href="digraph.html#add_vertex-1">add_vertex/1</a></li> <li title="del_edge-2"><a href="digraph.html#del_edge-2">del_edge/2</a></li> <li title="del_edges-2"><a href="digraph.html#del_edges-2">del_edges/2</a></li> <li title="del_path-3"><a href="digraph.html#del_path-3">del_path/3</a></li> <li title="del_vertex-2"><a href="digraph.html#del_vertex-2">del_vertex/2</a></li> <li title="del_vertices-2"><a href="digraph.html#del_vertices-2">del_vertices/2</a></li> <li title="delete-1"><a href="digraph.html#delete-1">delete/1</a></li> <li title="edge-2"><a href="digraph.html#edge-2">edge/2</a></li> <li title="edges-1"><a href="digraph.html#edges-1">edges/1</a></li> <li title="edges-2"><a href="digraph.html#edges-2">edges/2</a></li> <li title="get_cycle-2"><a href="digraph.html#get_cycle-2">get_cycle/2</a></li> <li title="get_path-3"><a href="digraph.html#get_path-3">get_path/3</a></li> <li title="get_short_cycle-2"><a href="digraph.html#get_short_cycle-2">get_short_cycle/2</a></li> <li title="get_short_path-3"><a href="digraph.html#get_short_path-3">get_short_path/3</a></li> <li title="in_degree-2"><a href="digraph.html#in_degree-2">in_degree/2</a></li> <li title="in_edges-2"><a href="digraph.html#in_edges-2">in_edges/2</a></li> <li title="in_neighbours-2"><a href="digraph.html#in_neighbours-2">in_neighbours/2</a></li> <li title="info-1"><a href="digraph.html#info-1">info/1</a></li> <li title="new-0"><a href="digraph.html#new-0">new/0</a></li> <li title="new-1"><a href="digraph.html#new-1">new/1</a></li> <li title="no_edges-1"><a href="digraph.html#no_edges-1">no_edges/1</a></li> <li title="no_vertices-1"><a href="digraph.html#no_vertices-1">no_vertices/1</a></li> <li title="out_degree-2"><a href="digraph.html#out_degree-2">out_degree/2</a></li> <li title="out_edges-2"><a href="digraph.html#out_edges-2">out_edges/2</a></li> <li title="out_neighbours-2"><a href="digraph.html#out_neighbours-2">out_neighbours/2</a></li> <li title="vertex-2"><a href="digraph.html#vertex-2">vertex/2</a></li> <li title="vertices-1"><a href="digraph.html#vertices-1">vertices/1</a></li> </ul> </li> <li id="no" title="digraph_utils " expanded="false">digraph_utils<ul> <li><a href="digraph_utils.html"> Top of manual page </a></li> <li title="arborescence_root-1"><a href="digraph_utils.html#arborescence_root-1">arborescence_root/1</a></li> <li title="components-1"><a href="digraph_utils.html#components-1">components/1</a></li> <li title="condensation-1"><a 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title="start_link-3"><a href="gen_server.html#start_link-3">start_link/3</a></li> <li title="start_link-4"><a href="gen_server.html#start_link-4">start_link/4</a></li> <li title="start-3"><a href="gen_server.html#start-3">start/3</a></li> <li title="start-4"><a href="gen_server.html#start-4">start/4</a></li> <li title="call-2"><a href="gen_server.html#call-2">call/2</a></li> <li title="call-3"><a href="gen_server.html#call-3">call/3</a></li> <li title="multi_call-2"><a href="gen_server.html#multi_call-2">multi_call/2</a></li> <li title="multi_call-3"><a href="gen_server.html#multi_call-3">multi_call/3</a></li> <li title="multi_call-4"><a href="gen_server.html#multi_call-4">multi_call/4</a></li> <li title="cast-2"><a href="gen_server.html#cast-2">cast/2</a></li> <li title="abcast-2"><a href="gen_server.html#abcast-2">abcast/2</a></li> <li title="abcast-3"><a href="gen_server.html#abcast-3">abcast/3</a></li> <li title="reply-2"><a href="gen_server.html#reply-2">reply/2</a></li> <li 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<li title="foldl-3"><a href="lists.html#foldl-3">foldl/3</a></li> <li title="foldr-3"><a href="lists.html#foldr-3">foldr/3</a></li> <li title="foreach-2"><a href="lists.html#foreach-2">foreach/2</a></li> <li title="keydelete-3"><a href="lists.html#keydelete-3">keydelete/3</a></li> <li title="keyfind-3"><a href="lists.html#keyfind-3">keyfind/3</a></li> <li title="keymap-3"><a href="lists.html#keymap-3">keymap/3</a></li> <li title="keymember-3"><a href="lists.html#keymember-3">keymember/3</a></li> <li title="keymerge-3"><a href="lists.html#keymerge-3">keymerge/3</a></li> <li title="keyreplace-4"><a href="lists.html#keyreplace-4">keyreplace/4</a></li> <li title="keysearch-3"><a href="lists.html#keysearch-3">keysearch/3</a></li> <li title="keysort-2"><a href="lists.html#keysort-2">keysort/2</a></li> <li title="keystore-4"><a href="lists.html#keystore-4">keystore/4</a></li> <li title="keytake-3"><a href="lists.html#keytake-3">keytake/3</a></li> <li title="last-1"><a href="lists.html#last-1">last/1</a></li> <li title="map-2"><a href="lists.html#map-2">map/2</a></li> <li title="mapfoldl-3"><a href="lists.html#mapfoldl-3">mapfoldl/3</a></li> <li title="mapfoldr-3"><a href="lists.html#mapfoldr-3">mapfoldr/3</a></li> <li title="max-1"><a href="lists.html#max-1">max/1</a></li> <li title="member-2"><a href="lists.html#member-2">member/2</a></li> <li title="merge-1"><a href="lists.html#merge-1">merge/1</a></li> <li title="merge-2"><a href="lists.html#merge-2">merge/2</a></li> <li title="merge-3"><a href="lists.html#merge-3">merge/3</a></li> <li title="merge3-3"><a href="lists.html#merge3-3">merge3/3</a></li> <li title="min-1"><a href="lists.html#min-1">min/1</a></li> <li title="nth-2"><a href="lists.html#nth-2">nth/2</a></li> <li title="nthtail-2"><a href="lists.html#nthtail-2">nthtail/2</a></li> <li title="partition-2"><a href="lists.html#partition-2">partition/2</a></li> <li title="prefix-2"><a href="lists.html#prefix-2">prefix/2</a></li> <li title="reverse-1"><a href="lists.html#reverse-1">reverse/1</a></li> <li title="reverse-2"><a href="lists.html#reverse-2">reverse/2</a></li> <li title="seq-2"><a href="lists.html#seq-2">seq/2</a></li> <li title="seq-3"><a href="lists.html#seq-3">seq/3</a></li> <li title="sort-1"><a href="lists.html#sort-1">sort/1</a></li> <li title="sort-2"><a href="lists.html#sort-2">sort/2</a></li> <li title="split-2"><a href="lists.html#split-2">split/2</a></li> <li title="splitwith-2"><a href="lists.html#splitwith-2">splitwith/2</a></li> <li title="sublist-2"><a href="lists.html#sublist-2">sublist/2</a></li> <li title="sublist-3"><a href="lists.html#sublist-3">sublist/3</a></li> <li title="subtract-2"><a href="lists.html#subtract-2">subtract/2</a></li> <li title="suffix-2"><a href="lists.html#suffix-2">suffix/2</a></li> <li title="sum-1"><a href="lists.html#sum-1">sum/1</a></li> <li title="takewhile-2"><a href="lists.html#takewhile-2">takewhile/2</a></li> <li title="ukeymerge-3"><a href="lists.html#ukeymerge-3">ukeymerge/3</a></li> <li title="ukeysort-2"><a href="lists.html#ukeysort-2">ukeysort/2</a></li> <li title="umerge-1"><a href="lists.html#umerge-1">umerge/1</a></li> <li title="umerge-2"><a href="lists.html#umerge-2">umerge/2</a></li> <li title="umerge-3"><a href="lists.html#umerge-3">umerge/3</a></li> <li title="umerge3-3"><a href="lists.html#umerge3-3">umerge3/3</a></li> <li title="unzip-1"><a href="lists.html#unzip-1">unzip/1</a></li> <li title="unzip3-1"><a href="lists.html#unzip3-1">unzip3/1</a></li> <li title="usort-1"><a href="lists.html#usort-1">usort/1</a></li> <li title="usort-2"><a href="lists.html#usort-2">usort/2</a></li> <li title="zip-2"><a href="lists.html#zip-2">zip/2</a></li> <li title="zip3-3"><a href="lists.html#zip3-3">zip3/3</a></li> <li title="zipwith-3"><a href="lists.html#zipwith-3">zipwith/3</a></li> <li title="zipwith3-4"><a href="lists.html#zipwith3-4">zipwith3/4</a></li> </ul> </li> <li id="no" title="log_mf_h " expanded="false">log_mf_h<ul> <li><a href="log_mf_h.html"> Top of manual page </a></li> <li title="init-3"><a href="log_mf_h.html#init-3">init/3</a></li> <li title="init-4"><a href="log_mf_h.html#init-4">init/4</a></li> </ul> </li> <li id="no" title="math " expanded="false">math<ul> <li><a href="math.html"> Top of manual page </a></li> <li title="pi-0"><a href="math.html#pi-0">pi/0</a></li> <li title="sin-1"><a href="math.html#sin-1">sin/1</a></li> <li title="cos-1"><a href="math.html#cos-1">cos/1</a></li> <li title="tan-1"><a href="math.html#tan-1">tan/1</a></li> <li title="asin-1"><a href="math.html#asin-1">asin/1</a></li> <li title="acos-1"><a href="math.html#acos-1">acos/1</a></li> <li title="atan-1"><a href="math.html#atan-1">atan/1</a></li> <li title="atan2-2"><a href="math.html#atan2-2">atan2/2</a></li> <li title="sinh-1"><a href="math.html#sinh-1">sinh/1</a></li> <li title="cosh-1"><a href="math.html#cosh-1">cosh/1</a></li> <li title="tanh-1"><a href="math.html#tanh-1">tanh/1</a></li> <li title="asinh-1"><a href="math.html#asinh-1">asinh/1</a></li> <li title="acosh-1"><a href="math.html#acosh-1">acosh/1</a></li> <li title="atanh-1"><a href="math.html#atanh-1">atanh/1</a></li> <li title="exp-1"><a href="math.html#exp-1">exp/1</a></li> <li title="log-1"><a href="math.html#log-1">log/1</a></li> <li title="log10-1"><a href="math.html#log10-1">log10/1</a></li> <li title="pow-2"><a href="math.html#pow-2">pow/2</a></li> <li title="sqrt-1"><a href="math.html#sqrt-1">sqrt/1</a></li> <li title="erf-1"><a href="math.html#erf-1">erf/1</a></li> <li title="erfc-1"><a href="math.html#erfc-1">erfc/1</a></li> </ul> </li> <li id="no" title="ms_transform " expanded="false">ms_transform<ul> <li><a href="ms_transform.html"> Top of manual page </a></li> <li title="parse_transform-2"><a href="ms_transform.html#parse_transform-2">parse_transform/2</a></li> <li title="transform_from_shell-3"><a href="ms_transform.html#transform_from_shell-3">transform_from_shell/3</a></li> <li title="format_error-1"><a href="ms_transform.html#format_error-1">format_error/1</a></li> </ul> </li> <li id="no" title="orddict " expanded="false">orddict<ul> <li><a href="orddict.html"> Top of manual page </a></li> <li title="append-3"><a href="orddict.html#append-3">append/3</a></li> <li title="append_list-3"><a href="orddict.html#append_list-3">append_list/3</a></li> <li title="erase-2"><a href="orddict.html#erase-2">erase/2</a></li> <li title="fetch-2"><a href="orddict.html#fetch-2">fetch/2</a></li> <li title="fetch_keys-1"><a href="orddict.html#fetch_keys-1">fetch_keys/1</a></li> <li title="filter-2"><a href="orddict.html#filter-2">filter/2</a></li> <li title="find-2"><a href="orddict.html#find-2">find/2</a></li> <li title="fold-3"><a href="orddict.html#fold-3">fold/3</a></li> <li title="from_list-1"><a href="orddict.html#from_list-1">from_list/1</a></li> <li title="is_key-2"><a href="orddict.html#is_key-2">is_key/2</a></li> <li title="map-2"><a href="orddict.html#map-2">map/2</a></li> <li title="merge-3"><a href="orddict.html#merge-3">merge/3</a></li> <li title="new-0"><a href="orddict.html#new-0">new/0</a></li> <li title="size-1"><a href="orddict.html#size-1">size/1</a></li> <li title="store-3"><a href="orddict.html#store-3">store/3</a></li> <li title="to_list-1"><a href="orddict.html#to_list-1">to_list/1</a></li> <li title="update-3"><a href="orddict.html#update-3">update/3</a></li> <li title="update-4"><a href="orddict.html#update-4">update/4</a></li> <li title="update_counter-3"><a href="orddict.html#update_counter-3">update_counter/3</a></li> </ul> </li> <li id="no" title="ordsets " expanded="false">ordsets<ul> <li><a href="ordsets.html"> Top of manual page </a></li> <li title="new-0"><a href="ordsets.html#new-0">new/0</a></li> <li title="is_set-1"><a href="ordsets.html#is_set-1">is_set/1</a></li> <li title="size-1"><a href="ordsets.html#size-1">size/1</a></li> <li title="to_list-1"><a href="ordsets.html#to_list-1">to_list/1</a></li> <li title="from_list-1"><a href="ordsets.html#from_list-1">from_list/1</a></li> <li title="is_element-2"><a href="ordsets.html#is_element-2">is_element/2</a></li> <li title="add_element-2"><a href="ordsets.html#add_element-2">add_element/2</a></li> <li title="del_element-2"><a href="ordsets.html#del_element-2">del_element/2</a></li> <li title="union-2"><a href="ordsets.html#union-2">union/2</a></li> <li title="union-1"><a href="ordsets.html#union-1">union/1</a></li> <li title="intersection-2"><a href="ordsets.html#intersection-2">intersection/2</a></li> <li title="intersection-1"><a href="ordsets.html#intersection-1">intersection/1</a></li> <li title="is_disjoint-2"><a href="ordsets.html#is_disjoint-2">is_disjoint/2</a></li> <li title="subtract-2"><a href="ordsets.html#subtract-2">subtract/2</a></li> <li title="is_subset-2"><a href="ordsets.html#is_subset-2">is_subset/2</a></li> <li title="fold-3"><a href="ordsets.html#fold-3">fold/3</a></li> <li title="filter-2"><a href="ordsets.html#filter-2">filter/2</a></li> </ul> </li> <li id="no" title="pg " expanded="false">pg<ul> <li><a href="pg.html"> Top of manual page </a></li> <li title="create-1"><a href="pg.html#create-1">create/1</a></li> <li title="create-2"><a href="pg.html#create-2">create/2</a></li> <li title="join-2"><a href="pg.html#join-2">join/2</a></li> <li title="send-2"><a href="pg.html#send-2">send/2</a></li> <li title="esend-2"><a href="pg.html#esend-2">esend/2</a></li> <li title="members-1"><a href="pg.html#members-1">members/1</a></li> </ul> </li> <li id="no" title="pool " expanded="false">pool<ul> <li><a href="pool.html"> Top of manual page </a></li> <li title="start-1"><a href="pool.html#start-1">start/1</a></li> <li title="start-2"><a href="pool.html#start-2">start/2</a></li> <li title="attach-1"><a href="pool.html#attach-1">attach/1</a></li> <li title="stop-0"><a href="pool.html#stop-0">stop/0</a></li> <li title="get_nodes-0"><a href="pool.html#get_nodes-0">get_nodes/0</a></li> <li title="pspawn-3"><a href="pool.html#pspawn-3">pspawn/3</a></li> <li title="pspawn_link-3"><a href="pool.html#pspawn_link-3">pspawn_link/3</a></li> <li title="get_node-0"><a href="pool.html#get_node-0">get_node/0</a></li> </ul> </li> <li id="no" title="proc_lib " expanded="false">proc_lib<ul> <li><a href="proc_lib.html"> Top of manual page </a></li> <li title="spawn-1"><a href="proc_lib.html#spawn-1">spawn/1</a></li> <li title="spawn-2"><a href="proc_lib.html#spawn-2">spawn/2</a></li> <li title="spawn-3"><a href="proc_lib.html#spawn-3">spawn/3</a></li> <li title="spawn-4"><a href="proc_lib.html#spawn-4">spawn/4</a></li> <li title="spawn_link-1"><a href="proc_lib.html#spawn_link-1">spawn_link/1</a></li> <li title="spawn_link-2"><a href="proc_lib.html#spawn_link-2">spawn_link/2</a></li> <li title="spawn_link-3"><a href="proc_lib.html#spawn_link-3">spawn_link/3</a></li> <li title="spawn_link-4"><a href="proc_lib.html#spawn_link-4">spawn_link/4</a></li> <li title="spawn_opt-2"><a href="proc_lib.html#spawn_opt-2">spawn_opt/2</a></li> <li title="spawn_opt-3"><a href="proc_lib.html#spawn_opt-3">spawn_opt/3</a></li> <li title="spawn_opt-4"><a href="proc_lib.html#spawn_opt-4">spawn_opt/4</a></li> <li title="spawn_opt-5"><a href="proc_lib.html#spawn_opt-5">spawn_opt/5</a></li> <li title="start-3"><a href="proc_lib.html#start-3">start/3</a></li> <li title="start-4"><a href="proc_lib.html#start-4">start/4</a></li> <li title="start-5"><a href="proc_lib.html#start-5">start/5</a></li> <li title="start_link-3"><a href="proc_lib.html#start_link-3">start_link/3</a></li> <li title="start_link-4"><a href="proc_lib.html#start_link-4">start_link/4</a></li> <li title="start_link-5"><a href="proc_lib.html#start_link-5">start_link/5</a></li> <li title="init_ack-2"><a href="proc_lib.html#init_ack-2">init_ack/2</a></li> <li title="init_ack-1"><a href="proc_lib.html#init_ack-1">init_ack/1</a></li> <li title="format-1"><a href="proc_lib.html#format-1">format/1</a></li> <li title="initial_call-1"><a href="proc_lib.html#initial_call-1">initial_call/1</a></li> <li title="translate_initial_call-1"><a href="proc_lib.html#translate_initial_call-1">translate_initial_call/1</a></li> <li title="hibernate-3"><a href="proc_lib.html#hibernate-3">hibernate/3</a></li> </ul> </li> <li id="no" title="proplists " expanded="false">proplists<ul> <li><a href="proplists.html"> Top of manual page </a></li> <li title="append_values-2"><a href="proplists.html#append_values-2">append_values/2</a></li> <li title="compact-1"><a href="proplists.html#compact-1">compact/1</a></li> <li title="delete-2"><a href="proplists.html#delete-2">delete/2</a></li> <li title="expand-2"><a href="proplists.html#expand-2">expand/2</a></li> <li title="get_all_values-2"><a href="proplists.html#get_all_values-2">get_all_values/2</a></li> <li title="get_bool-2"><a href="proplists.html#get_bool-2">get_bool/2</a></li> <li title="get_keys-1"><a href="proplists.html#get_keys-1">get_keys/1</a></li> <li title="get_value-2"><a href="proplists.html#get_value-2">get_value/2</a></li> <li title="get_value-3"><a href="proplists.html#get_value-3">get_value/3</a></li> <li title="is_defined-2"><a href="proplists.html#is_defined-2">is_defined/2</a></li> <li title="lookup-2"><a href="proplists.html#lookup-2">lookup/2</a></li> <li title="lookup_all-2"><a href="proplists.html#lookup_all-2">lookup_all/2</a></li> <li title="normalize-2"><a href="proplists.html#normalize-2">normalize/2</a></li> <li title="property-1"><a href="proplists.html#property-1">property/1</a></li> <li title="property-2"><a href="proplists.html#property-2">property/2</a></li> <li title="split-2"><a href="proplists.html#split-2">split/2</a></li> <li title="substitute_aliases-2"><a href="proplists.html#substitute_aliases-2">substitute_aliases/2</a></li> <li title="substitute_negations-2"><a href="proplists.html#substitute_negations-2">substitute_negations/2</a></li> <li title="unfold-1"><a href="proplists.html#unfold-1">unfold/1</a></li> </ul> </li> <li id="no" title="qlc " expanded="false">qlc<ul> <li><a href="qlc.html"> Top of manual page </a></li> <li title="append-1"><a href="qlc.html#append-1">append/1</a></li> <li title="append-2"><a href="qlc.html#append-2">append/2</a></li> <li title="cursor-1"><a href="qlc.html#cursor-1">cursor/1</a></li> <li title="delete_cursor-1"><a href="qlc.html#delete_cursor-1">delete_cursor/1</a></li> <li title="eval-1"><a href="qlc.html#eval-1">eval/1</a></li> <li title="e-1"><a href="qlc.html#e-1">e/1</a></li> <li title="fold-3"><a href="qlc.html#fold-3">fold/3</a></li> <li title="format_error-1"><a href="qlc.html#format_error-1">format_error/1</a></li> <li title="info-1"><a href="qlc.html#info-1">info/1</a></li> <li title="keysort-2"><a href="qlc.html#keysort-2">keysort/2</a></li> <li title="next_answers-1"><a href="qlc.html#next_answers-1">next_answers/1</a></li> <li title="q-1"><a href="qlc.html#q-1">q/1</a></li> <li title="sort-1"><a href="qlc.html#sort-1">sort/1</a></li> <li title="string_to_handle-1"><a href="qlc.html#string_to_handle-1">string_to_handle/1</a></li> <li title="table-2"><a href="qlc.html#table-2">table/2</a></li> </ul> </li> <li id="no" title="queue " expanded="false">queue<ul> <li><a href="queue.html"> Top of manual page </a></li> <li title="new-0"><a href="queue.html#new-0">new/0</a></li> <li title="is_queue-1"><a href="queue.html#is_queue-1">is_queue/1</a></li> <li title="is_empty-1"><a href="queue.html#is_empty-1">is_empty/1</a></li> <li title="len-1"><a href="queue.html#len-1">len/1</a></li> <li title="in-2"><a href="queue.html#in-2">in/2</a></li> <li title="in_r-2"><a href="queue.html#in_r-2">in_r/2</a></li> <li title="out-1"><a href="queue.html#out-1">out/1</a></li> <li title="out_r-1"><a href="queue.html#out_r-1">out_r/1</a></li> <li title="from_list-1"><a href="queue.html#from_list-1">from_list/1</a></li> <li title="to_list-1"><a href="queue.html#to_list-1">to_list/1</a></li> <li title="reverse-1"><a href="queue.html#reverse-1">reverse/1</a></li> <li title="split-2"><a href="queue.html#split-2">split/2</a></li> <li title="join-2"><a href="queue.html#join-2">join/2</a></li> <li title="filter-2"><a href="queue.html#filter-2">filter/2</a></li> <li title="member-2"><a href="queue.html#member-2">member/2</a></li> <li title="get-1"><a href="queue.html#get-1">get/1</a></li> <li title="get_r-1"><a href="queue.html#get_r-1">get_r/1</a></li> <li title="drop-1"><a href="queue.html#drop-1">drop/1</a></li> <li title="drop_r-1"><a href="queue.html#drop_r-1">drop_r/1</a></li> <li title="peek-1"><a href="queue.html#peek-1">peek/1</a></li> <li title="peek_r-1"><a href="queue.html#peek_r-1">peek_r/1</a></li> <li title="cons-2"><a href="queue.html#cons-2">cons/2</a></li> <li title="head-1"><a href="queue.html#head-1">head/1</a></li> <li title="tail-1"><a href="queue.html#tail-1">tail/1</a></li> <li title="snoc-2"><a href="queue.html#snoc-2">snoc/2</a></li> <li title="daeh-1"><a href="queue.html#daeh-1">daeh/1</a></li> <li title="last-1"><a href="queue.html#last-1">last/1</a></li> <li title="liat-1"><a href="queue.html#liat-1">liat/1</a></li> <li title="init-1"><a href="queue.html#init-1">init/1</a></li> <li title="lait-1"><a href="queue.html#lait-1">lait/1</a></li> </ul> </li> <li id="no" title="random " expanded="false">random<ul> <li><a href="random.html"> Top of manual page </a></li> <li title="seed-0"><a href="random.html#seed-0">seed/0</a></li> <li title="seed-3"><a href="random.html#seed-3">seed/3</a></li> <li title="seed-1"><a href="random.html#seed-1">seed/1</a></li> <li title="seed0-0"><a href="random.html#seed0-0">seed0/0</a></li> <li title="uniform-0"><a href="random.html#uniform-0">uniform/0</a></li> <li title="uniform-1"><a href="random.html#uniform-1">uniform/1</a></li> <li title="uniform_s-1"><a href="random.html#uniform_s-1">uniform_s/1</a></li> <li title="uniform_s-2"><a href="random.html#uniform_s-2">uniform_s/2</a></li> </ul> </li> <li id="no" title="re " expanded="false">re<ul> <li><a href="re.html"> Top of manual page </a></li> <li title="compile-1"><a href="re.html#compile-1">compile/1</a></li> <li title="compile-2"><a href="re.html#compile-2">compile/2</a></li> <li title="run-2"><a href="re.html#run-2">run/2</a></li> <li title="run-3"><a href="re.html#run-3">run/3</a></li> <li title="replace-3"><a href="re.html#replace-3">replace/3</a></li> <li title="replace-4"><a href="re.html#replace-4">replace/4</a></li> <li title="split-2"><a href="re.html#split-2">split/2</a></li> <li title="split-3"><a href="re.html#split-3">split/3</a></li> </ul> </li> <li id="no" title="regexp " expanded="false">regexp<ul> <li><a href="regexp.html"> Top of manual page </a></li> <li title="match-2"><a href="regexp.html#match-2">match/2</a></li> <li title="first_match-2"><a href="regexp.html#first_match-2">first_match/2</a></li> <li title="matches-2"><a href="regexp.html#matches-2">matches/2</a></li> <li title="sub-3"><a href="regexp.html#sub-3">sub/3</a></li> <li title="gsub-3"><a href="regexp.html#gsub-3">gsub/3</a></li> <li title="split-2"><a href="regexp.html#split-2">split/2</a></li> <li title="sh_to_awk-1"><a href="regexp.html#sh_to_awk-1">sh_to_awk/1</a></li> <li title="parse-1"><a href="regexp.html#parse-1">parse/1</a></li> <li title="format_error-1"><a href="regexp.html#format_error-1">format_error/1</a></li> </ul> </li> <li id="no" title="sets " expanded="false">sets<ul> <li><a href="sets.html"> Top of manual page </a></li> <li title="new-0"><a href="sets.html#new-0">new/0</a></li> <li title="is_set-1"><a href="sets.html#is_set-1">is_set/1</a></li> <li title="size-1"><a href="sets.html#size-1">size/1</a></li> <li title="to_list-1"><a href="sets.html#to_list-1">to_list/1</a></li> <li title="from_list-1"><a href="sets.html#from_list-1">from_list/1</a></li> <li title="is_element-2"><a href="sets.html#is_element-2">is_element/2</a></li> <li title="add_element-2"><a href="sets.html#add_element-2">add_element/2</a></li> <li title="del_element-2"><a href="sets.html#del_element-2">del_element/2</a></li> <li title="union-2"><a href="sets.html#union-2">union/2</a></li> <li title="union-1"><a href="sets.html#union-1">union/1</a></li> <li title="intersection-2"><a href="sets.html#intersection-2">intersection/2</a></li> <li title="intersection-1"><a href="sets.html#intersection-1">intersection/1</a></li> <li title="is_disjoint-2"><a href="sets.html#is_disjoint-2">is_disjoint/2</a></li> <li title="subtract-2"><a href="sets.html#subtract-2">subtract/2</a></li> <li title="is_subset-2"><a href="sets.html#is_subset-2">is_subset/2</a></li> <li title="fold-3"><a href="sets.html#fold-3">fold/3</a></li> <li title="filter-2"><a href="sets.html#filter-2">filter/2</a></li> </ul> </li> <li id="no" title="shell " expanded="false">shell<ul> <li><a href="shell.html"> Top of manual page </a></li> <li title="history-1"><a href="shell.html#history-1">history/1</a></li> <li title="results-1"><a href="shell.html#results-1">results/1</a></li> <li title="catch_exception-1"><a href="shell.html#catch_exception-1">catch_exception/1</a></li> <li title="prompt_func-1"><a href="shell.html#prompt_func-1">prompt_func/1</a></li> <li title="start_restricted-1"><a href="shell.html#start_restricted-1">start_restricted/1</a></li> <li title="stop_restricted-0"><a href="shell.html#stop_restricted-0">stop_restricted/0</a></li> </ul> </li> <li title="shell_default"><a href="shell_default.html">shell_default</a></li> <li id="no" title="slave " expanded="false">slave<ul> <li><a href="slave.html"> Top of manual page </a></li> <li title="start-1"><a href="slave.html#start-1">start/1</a></li> <li title="start-2"><a href="slave.html#start-2">start/2</a></li> <li title="start-3"><a href="slave.html#start-3">start/3</a></li> <li title="start_link-1"><a href="slave.html#start_link-1">start_link/1</a></li> <li title="start_link-2"><a href="slave.html#start_link-2">start_link/2</a></li> <li title="start_link-3"><a href="slave.html#start_link-3">start_link/3</a></li> <li title="stop-1"><a href="slave.html#stop-1">stop/1</a></li> <li title="pseudo-1"><a href="slave.html#pseudo-1">pseudo/1</a></li> <li title="pseudo-2"><a href="slave.html#pseudo-2">pseudo/2</a></li> <li title="relay-1"><a href="slave.html#relay-1">relay/1</a></li> </ul> </li> <li id="no" title="sofs " expanded="false">sofs<ul> <li><a href="sofs.html"> Top of manual page </a></li> <li title="a_function-1"><a href="sofs.html#a_function-1">a_function/1</a></li> <li title="canonical_relation-1"><a href="sofs.html#canonical_relation-1">canonical_relation/1</a></li> <li title="composite-2"><a href="sofs.html#composite-2">composite/2</a></li> <li title="constant_function-2"><a href="sofs.html#constant_function-2">constant_function/2</a></li> <li title="converse-1"><a href="sofs.html#converse-1">converse/1</a></li> <li title="difference-2"><a href="sofs.html#difference-2">difference/2</a></li> <li title="digraph_to_family-1"><a href="sofs.html#digraph_to_family-1">digraph_to_family/1</a></li> <li title="domain-1"><a href="sofs.html#domain-1">domain/1</a></li> <li title="drestriction-2"><a href="sofs.html#drestriction-2">drestriction/2</a></li> <li title="drestriction-3"><a href="sofs.html#drestriction-3">drestriction/3</a></li> <li title="empty_set-0"><a href="sofs.html#empty_set-0">empty_set/0</a></li> <li title="extension-3"><a href="sofs.html#extension-3">extension/3</a></li> <li title="family-1"><a href="sofs.html#family-1">family/1</a></li> <li title="family_difference-2"><a href="sofs.html#family_difference-2">family_difference/2</a></li> <li title="family_domain-1"><a href="sofs.html#family_domain-1">family_domain/1</a></li> <li title="family_field-1"><a href="sofs.html#family_field-1">family_field/1</a></li> <li title="family_intersection-1"><a href="sofs.html#family_intersection-1">family_intersection/1</a></li> <li title="family_intersection-2"><a href="sofs.html#family_intersection-2">family_intersection/2</a></li> <li title="family_projection-2"><a href="sofs.html#family_projection-2">family_projection/2</a></li> <li title="family_range-1"><a href="sofs.html#family_range-1">family_range/1</a></li> <li title="family_specification-2"><a href="sofs.html#family_specification-2">family_specification/2</a></li> <li title="family_to_digraph-1"><a href="sofs.html#family_to_digraph-1">family_to_digraph/1</a></li> <li title="family_to_relation-1"><a href="sofs.html#family_to_relation-1">family_to_relation/1</a></li> <li title="family_union-1"><a href="sofs.html#family_union-1">family_union/1</a></li> <li title="family_union-2"><a href="sofs.html#family_union-2">family_union/2</a></li> <li title="field-1"><a href="sofs.html#field-1">field/1</a></li> <li title="from_external-2"><a href="sofs.html#from_external-2">from_external/2</a></li> <li title="from_sets-1"><a href="sofs.html#from_sets-1">from_sets/1</a></li> <li title="from_sets-1"><a href="sofs.html#from_sets-1">from_sets/1</a></li> <li title="from_term-1"><a href="sofs.html#from_term-1">from_term/1</a></li> <li title="image-2"><a href="sofs.html#image-2">image/2</a></li> <li title="intersection-1"><a href="sofs.html#intersection-1">intersection/1</a></li> <li title="intersection-2"><a href="sofs.html#intersection-2">intersection/2</a></li> <li title="intersection_of_family-1"><a href="sofs.html#intersection_of_family-1">intersection_of_family/1</a></li> <li title="inverse-1"><a href="sofs.html#inverse-1">inverse/1</a></li> <li title="inverse_image-2"><a href="sofs.html#inverse_image-2">inverse_image/2</a></li> <li title="is_a_function-1"><a href="sofs.html#is_a_function-1">is_a_function/1</a></li> <li title="is_disjoint-2"><a href="sofs.html#is_disjoint-2">is_disjoint/2</a></li> <li title="is_empty_set-1"><a href="sofs.html#is_empty_set-1">is_empty_set/1</a></li> <li title="is_equal-2"><a href="sofs.html#is_equal-2">is_equal/2</a></li> <li title="is_set-1"><a href="sofs.html#is_set-1">is_set/1</a></li> <li title="is_sofs_set-1"><a href="sofs.html#is_sofs_set-1">is_sofs_set/1</a></li> <li title="is_subset-2"><a href="sofs.html#is_subset-2">is_subset/2</a></li> <li title="is_type-1"><a href="sofs.html#is_type-1">is_type/1</a></li> <li title="join-4"><a href="sofs.html#join-4">join/4</a></li> <li title="multiple_relative_product-2"><a href="sofs.html#multiple_relative_product-2">multiple_relative_product/2</a></li> <li title="no_elements-1"><a href="sofs.html#no_elements-1">no_elements/1</a></li> <li title="partition-1"><a href="sofs.html#partition-1">partition/1</a></li> <li title="partition-2"><a href="sofs.html#partition-2">partition/2</a></li> <li title="partition-3"><a href="sofs.html#partition-3">partition/3</a></li> <li title="partition_family-2"><a href="sofs.html#partition_family-2">partition_family/2</a></li> <li title="product-1"><a href="sofs.html#product-1">product/1</a></li> <li title="product-2"><a href="sofs.html#product-2">product/2</a></li> <li title="projection-2"><a href="sofs.html#projection-2">projection/2</a></li> <li title="range-1"><a href="sofs.html#range-1">range/1</a></li> <li title="relation-1"><a href="sofs.html#relation-1">relation/1</a></li> <li title="relation_to_family-1"><a href="sofs.html#relation_to_family-1">relation_to_family/1</a></li> <li title="relative_product-1"><a href="sofs.html#relative_product-1">relative_product/1</a></li> <li title="relative_product-2"><a href="sofs.html#relative_product-2">relative_product/2</a></li> <li title="relative_product1-2"><a href="sofs.html#relative_product1-2">relative_product1/2</a></li> <li title="restriction-2"><a href="sofs.html#restriction-2">restriction/2</a></li> <li title="restriction-3"><a href="sofs.html#restriction-3">restriction/3</a></li> <li title="set-1"><a href="sofs.html#set-1">set/1</a></li> <li title="specification-2"><a href="sofs.html#specification-2">specification/2</a></li> <li title="strict_relation-1"><a href="sofs.html#strict_relation-1">strict_relation/1</a></li> <li title="substitution-2"><a href="sofs.html#substitution-2">substitution/2</a></li> <li title="symdiff-2"><a href="sofs.html#symdiff-2">symdiff/2</a></li> <li title="symmetric_partition-2"><a href="sofs.html#symmetric_partition-2">symmetric_partition/2</a></li> <li title="to_external-1"><a href="sofs.html#to_external-1">to_external/1</a></li> <li title="to_sets-1"><a href="sofs.html#to_sets-1">to_sets/1</a></li> <li title="type-1"><a href="sofs.html#type-1">type/1</a></li> <li title="union-1"><a href="sofs.html#union-1">union/1</a></li> <li title="union-2"><a href="sofs.html#union-2">union/2</a></li> <li title="union_of_family-1"><a href="sofs.html#union_of_family-1">union_of_family/1</a></li> <li title="weak_relation-1"><a href="sofs.html#weak_relation-1">weak_relation/1</a></li> </ul> </li> <li id="no" title="string " expanded="false">string<ul> <li><a href="string.html"> Top of manual page </a></li> <li title="len-1"><a href="string.html#len-1">len/1</a></li> <li title="equal-2"><a href="string.html#equal-2">equal/2</a></li> <li title="concat-2"><a href="string.html#concat-2">concat/2</a></li> <li title="chr-2"><a href="string.html#chr-2">chr/2</a></li> <li title="rchr-2"><a href="string.html#rchr-2">rchr/2</a></li> <li title="str-2"><a href="string.html#str-2">str/2</a></li> <li title="rstr-2"><a href="string.html#rstr-2">rstr/2</a></li> <li title="span-2"><a href="string.html#span-2">span/2</a></li> <li title="cspan-2"><a href="string.html#cspan-2">cspan/2</a></li> <li title="substr-2"><a href="string.html#substr-2">substr/2</a></li> <li title="substr-3"><a href="string.html#substr-3">substr/3</a></li> <li title="tokens-2"><a href="string.html#tokens-2">tokens/2</a></li> <li title="join-2"><a href="string.html#join-2">join/2</a></li> <li title="chars-2"><a href="string.html#chars-2">chars/2</a></li> <li title="chars-3"><a href="string.html#chars-3">chars/3</a></li> <li title="copies-2"><a href="string.html#copies-2">copies/2</a></li> <li title="words-1"><a href="string.html#words-1">words/1</a></li> <li title="words-2"><a href="string.html#words-2">words/2</a></li> <li title="sub_word-2"><a href="string.html#sub_word-2">sub_word/2</a></li> <li title="sub_word-3"><a href="string.html#sub_word-3">sub_word/3</a></li> <li title="strip-1"><a href="string.html#strip-1">strip/1</a></li> <li title="strip-2"><a href="string.html#strip-2">strip/2</a></li> <li title="strip-3"><a href="string.html#strip-3">strip/3</a></li> <li title="left-2"><a href="string.html#left-2">left/2</a></li> <li title="left-3"><a href="string.html#left-3">left/3</a></li> <li title="right-2"><a href="string.html#right-2">right/2</a></li> <li title="right-3"><a href="string.html#right-3">right/3</a></li> <li title="centre-2"><a href="string.html#centre-2">centre/2</a></li> <li title="centre-3"><a href="string.html#centre-3">centre/3</a></li> <li title="sub_string-2"><a href="string.html#sub_string-2">sub_string/2</a></li> <li title="sub_string-3"><a href="string.html#sub_string-3">sub_string/3</a></li> <li title="to_float-1"><a href="string.html#to_float-1">to_float/1</a></li> <li title="to_integer-1"><a href="string.html#to_integer-1">to_integer/1</a></li> <li title="to_lower-1"><a href="string.html#to_lower-1">to_lower/1</a></li> <li title="to_lower-1"><a href="string.html#to_lower-1">to_lower/1</a></li> <li title="to_upper-1"><a href="string.html#to_upper-1">to_upper/1</a></li> <li title="to_upper-1"><a href="string.html#to_upper-1">to_upper/1</a></li> </ul> </li> <li id="no" title="supervisor " expanded="false">supervisor<ul> <li><a href="supervisor.html"> Top of manual page </a></li> <li title="start_link-2"><a href="supervisor.html#start_link-2">start_link/2</a></li> <li title="start_link-3"><a href="supervisor.html#start_link-3">start_link/3</a></li> <li title="start_child-2"><a href="supervisor.html#start_child-2">start_child/2</a></li> <li title="terminate_child-2"><a href="supervisor.html#terminate_child-2">terminate_child/2</a></li> <li title="delete_child-2"><a href="supervisor.html#delete_child-2">delete_child/2</a></li> <li title="restart_child-2"><a href="supervisor.html#restart_child-2">restart_child/2</a></li> <li title="which_children-1"><a href="supervisor.html#which_children-1">which_children/1</a></li> <li title="count_children-1"><a href="supervisor.html#count_children-1">count_children/1</a></li> <li title="check_childspecs-1"><a href="supervisor.html#check_childspecs-1">check_childspecs/1</a></li> <li title="Module:init-1"><a href="supervisor.html#Module:init-1">Module:init/1</a></li> </ul> </li> <li id="no" title="supervisor_bridge " expanded="false">supervisor_bridge<ul> <li><a href="supervisor_bridge.html"> Top of manual page </a></li> <li title="start_link-2"><a href="supervisor_bridge.html#start_link-2">start_link/2</a></li> <li title="start_link-3"><a href="supervisor_bridge.html#start_link-3">start_link/3</a></li> <li title="Module:init-1"><a href="supervisor_bridge.html#Module:init-1">Module:init/1</a></li> <li title="Module:terminate-2"><a href="supervisor_bridge.html#Module:terminate-2">Module:terminate/2</a></li> </ul> </li> <li id="no" title="sys " expanded="false">sys<ul> <li><a href="sys.html"> Top of manual page </a></li> <li title="log-2"><a href="sys.html#log-2">log/2</a></li> <li title="log-3"><a href="sys.html#log-3">log/3</a></li> <li title="log_to_file-2"><a href="sys.html#log_to_file-2">log_to_file/2</a></li> <li title="log_to_file-3"><a href="sys.html#log_to_file-3">log_to_file/3</a></li> <li title="statistics-2"><a href="sys.html#statistics-2">statistics/2</a></li> <li title="statistics-3"><a href="sys.html#statistics-3">statistics/3</a></li> <li title="trace-2"><a href="sys.html#trace-2">trace/2</a></li> <li title="trace-3"><a href="sys.html#trace-3">trace/3</a></li> <li title="no_debug-1"><a href="sys.html#no_debug-1">no_debug/1</a></li> <li title="no_debug-2"><a href="sys.html#no_debug-2">no_debug/2</a></li> <li title="suspend-1"><a href="sys.html#suspend-1">suspend/1</a></li> <li title="suspend-2"><a href="sys.html#suspend-2">suspend/2</a></li> <li title="resume-1"><a href="sys.html#resume-1">resume/1</a></li> <li title="resume-2"><a href="sys.html#resume-2">resume/2</a></li> <li title="change_code-4"><a href="sys.html#change_code-4">change_code/4</a></li> <li title="change_code-5"><a href="sys.html#change_code-5">change_code/5</a></li> <li title="get_status-1"><a href="sys.html#get_status-1">get_status/1</a></li> <li title="get_status-2"><a href="sys.html#get_status-2">get_status/2</a></li> <li title="install-2"><a href="sys.html#install-2">install/2</a></li> <li title="install-3"><a href="sys.html#install-3">install/3</a></li> <li title="remove-2"><a href="sys.html#remove-2">remove/2</a></li> <li title="remove-3"><a href="sys.html#remove-3">remove/3</a></li> <li title="debug_options-1"><a href="sys.html#debug_options-1">debug_options/1</a></li> <li title="get_debug-3"><a href="sys.html#get_debug-3">get_debug/3</a></li> <li title="handle_debug-4"><a href="sys.html#handle_debug-4">handle_debug/4</a></li> <li title="handle_system_msg-6"><a href="sys.html#handle_system_msg-6">handle_system_msg/6</a></li> <li title="print_log-1"><a href="sys.html#print_log-1">print_log/1</a></li> <li title="Mod:system_continue-3"><a href="sys.html#Mod:system_continue-3">Mod:system_continue/3</a></li> <li title="Mod:system_terminate-4"><a href="sys.html#Mod:system_terminate-4">Mod:system_terminate/4</a></li> <li title="Mod:system_code_change-4"><a href="sys.html#Mod:system_code_change-4">Mod:system_code_change/4</a></li> </ul> </li> <li id="no" title="timer " expanded="false">timer<ul> <li><a href="timer.html"> Top of manual page 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title="zip_close-1"><a href="zip.html#zip_close-1">zip_close/1</a></li> </ul> </li> </ul> </div></div> <div id="content"> <div class="innertube"> <!-- refpage --><center><h1>dets</h1></center> <h3>MODULE</h3> <div class="REFBODY">dets</div> <h3>MODULE SUMMARY</h3> <div class="REFBODY">A Disk Based Term Storage</div> <h3>DESCRIPTION</h3> <div class="REFBODY"><p> <p>The module <span class="code">dets</span> provides a term storage on file. The stored terms, in this module called <strong>objects</strong>, are tuples such that one element is defined to be the key. A Dets <strong>table</strong> is a collection of objects with the key at the same position stored on a file.</p> <p>Dets is used by the Mnesia application, and is provided as is for users who are interested in an efficient storage of Erlang terms on disk only. Many applications just need to store some terms in a file. Mnesia adds transactions, queries, and distribution. The size of Dets files cannot exceed 2 GB. If larger tables are needed, Mnesia's table fragmentation can be used.</p> <p>There are three types of Dets tables: set, bag and duplicate_bag. A table of type <strong>set</strong> has at most one object with a given key. If an object with a key already present in the table is inserted, the existing object is overwritten by the new object. A table of type <strong>bag</strong> has zero or more different objects with a given key. A table of type <strong>duplicate_bag</strong> has zero or more possibly matching objects with a given key.</p> <p>Dets tables must be opened before they can be updated or read, and when finished they must be properly closed. If a table has not been properly closed, Dets will automatically repair the table. This can take a substantial time if the table is large. A Dets table is closed when the process which opened the table terminates. If several Erlang processes (users) open the same Dets table, they will share the table. The table is properly closed when all users have either terminated or closed the table. Dets tables are not properly closed if the Erlang runtime system is terminated abnormally.</p> <div class="note"> <div class="label">Note</div> <div class="content"><p> <p>A ^C command abnormally terminates an Erlang runtime system in a Unix environment with a break-handler.</p> </p></div> </div> <p>Since all operations performed by Dets are disk operations, it is important to realize that a single look-up operation involves a series of disk seek and read operations. For this reason, the Dets functions are much slower than the corresponding Ets functions, although Dets exports a similar interface.</p> <p>Dets organizes data as a linear hash list and the hash list grows gracefully as more data is inserted into the table. Space management on the file is performed by what is called a buddy system. The current implementation keeps the entire buddy system in RAM, which implies that if the table gets heavily fragmented, quite some memory can be used up. The only way to defragment a table is to close it and then open it again with the <span class="code">repair</span> option set to <span class="code">force</span>.</p> <p>It is worth noting that the ordered_set type present in Ets is not yet implemented by Dets, neither is the limited support for concurrent updates which makes a sequence of <span class="code">first</span> and <span class="code">next</span> calls safe to use on fixed Ets tables. Both these features will be implemented by Dets in a future release of Erlang/OTP. Until then, the Mnesia application (or some user implemented method for locking) has to be used to implement safe concurrency. Currently, no library of Erlang/OTP has support for ordered disk based term storage.</p> <p>Two versions of the format used for storing objects on file are supported by Dets. The first version, 8, is the format always used for tables created by OTP R7 and earlier. The second version, 9, is the default version of tables created by OTP R8 (and later OTP releases). OTP R8 can create version 8 tables, and convert version 8 tables to version 9, and vice versa, upon request. </p> <p>All Dets functions return <span class="code">{error, Reason}</span> if an error occurs (<span class="code">first/1</span> and <span class="code">next/2</span> are exceptions, they exit the process with the error tuple). If given badly formed arguments, all functions exit the process with a <span class="code">badarg</span> message.</p> <p><strong>Types</strong></p> <div class="example"><pre> access() = read | read_write auto_save() = infinity | int() bindings_cont() = tuple() bool() = true | false file() = string() int() = integer() >= 0 keypos() = integer() >= 1 name() = atom() | ref() no_slots() = integer() >= 0 | default object() = tuple() object_cont() = tuple() select_cont() = tuple() type() = bag | duplicate_bag | set version() = 8 | 9 | default </pre></div> </p></div> <h3>EXPORTS</h3> <p><a name="all-0"><span class="bold_code">all() -> [Name]</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns a list of the names of all open tables on this node.</p> </p></div> <p><a name="bchunk-2"><span class="bold_code">bchunk(Name, Continuation) -> {Continuation2, Data} | '$end_of_table' | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Continuation = start | cont()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Continuation2 = cont()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Data = binary() | tuple()</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns a list of objects stored in a table. The exact representation of the returned objects is not public. The lists of data can be used for initializing a table by giving the value <span class="code">bchunk</span> to the <span class="code">format</span> option of the <span class="code">init_table/3</span> function. The Mnesia application uses this function for copying open tables.</p> <p>Unless the table is protected using <span class="code">safe_fixtable/2</span>, calls to <span class="code">bchunk/2</span> may not work as expected if concurrent updates are made to the table.</p> <p>The first time <span class="code">bchunk/2</span> is called, an initial continuation, the atom <span class="code">start</span>, must be provided.</p> <p>The <span class="code">bchunk/2</span> function returns a tuple <span class="code">{Continuation2, Data}</span>, where <span class="code">Data</span> is a list of objects. <span class="code">Continuation2</span> is another continuation which is to be passed on to a subsequent call to <span class="code">bchunk/2</span>. With a series of calls to <span class="code">bchunk/2</span> it is possible to extract all objects of the table. </p> <p><span class="code">bchunk/2</span> returns <span class="code">'$end_of_table'</span> when all objects have been returned, or <span class="code">{error, Reason}</span> if an error occurs. </p> </p></div> <p><a name="close-1"><span class="bold_code">close(Name) -> ok | {error, Reason} </span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> </div> <div class="REFBODY"><p> <p>Closes a table. Only processes that have opened a table are allowed to close it. </p> <p>All open tables must be closed before the system is stopped. If an attempt is made to open a table which has not been properly closed, Dets automatically tries to repair the table.</p> </p></div> <p><a name="delete-2"><span class="bold_code">delete(Name, Key) -> ok | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> </div> <div class="REFBODY"><p> <p>Deletes all objects with the key <span class="code">Key</span> from the table <span class="code">Name</span>.</p> </p></div> <p><a name="delete_all_objects-1"><span class="bold_code">delete_all_objects(Name) -> ok | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> </div> <div class="REFBODY"><p> <p>Deletes all objects from a table in almost constant time. However, if the table if fixed, <span class="code">delete_all_objects(T)</span> is equivalent to <span class="code">match_delete(T, '_')</span>.</p> </p></div> <p><a name="delete_object-2"><span class="bold_code">delete_object(Name, Object) -> ok | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Object = object()</span><br> </div> </div> <div class="REFBODY"><p> <p>Deletes all instances of a given object from a table. If a table is of type <span class="code">bag</span> or <span class="code">duplicate_bag</span>, the <span class="code">delete/2</span> function cannot be used to delete only some of the objects with a given key. This function makes this possible.</p> </p></div> <p><a name="first-1"><span class="bold_code">first(Name) -> Key | '$end_of_table'</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Key = term()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns the first key stored in the table <span class="code">Name</span> according to the table's internal order, or <span class="code">'$end_of_table'</span> if the table is empty.</p> <p>Unless the table is protected using <span class="code">safe_fixtable/2</span>, subsequent calls to <span class="code">next/2</span> may not work as expected if concurrent updates are made to the table.</p> <p>Should an error occur, the process is exited with an error tuple <span class="code">{error, Reason}</span>. The reason for not returning the error tuple is that it cannot be distinguished from a key.</p> <p>There are two reasons why <span class="code">first/1</span> and <span class="code">next/2</span> should not be used: they are not very efficient, and they prevent the use of the key <span class="code">'$end_of_table'</span> since this atom is used to indicate the end of the table. If possible, the <span class="code">match</span>, <span class="code">match_object</span>, and <span class="code">select</span> functions should be used for traversing tables.</p> </p></div> <p><a name="foldl-3"><span class="bold_code">foldl(Function, Acc0, Name) -> Acc1 | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Function = fun(Object, AccIn) -> AccOut</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Acc0 = Acc1 = AccIn = AccOut = term()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Object = object()</span><br> </div> </div> <div class="REFBODY"><p> <p>Calls <span class="code">Function</span> on successive elements of the table <span class="code">Name</span> together with an extra argument <span class="code">AccIn</span>. The order in which the elements of the table are traversed is unspecified. <span class="code">Function</span> must return a new accumulator which is passed to the next call. <span class="code">Acc0</span> is returned if the table is empty.</p> </p></div> <p><a name="foldr-3"><span class="bold_code">foldr(Function, Acc0, Name) -> Acc1 | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Function = fun(Object, AccIn) -> AccOut</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Acc0 = Acc1 = AccIn = AccOut = term()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Object = object()</span><br> </div> </div> <div class="REFBODY"><p> <p>Calls <span class="code">Function</span> on successive elements of the table <span class="code">Name</span> together with an extra argument <span class="code">AccIn</span>. The order in which the elements of the table are traversed is unspecified. <span class="code">Function</span> must return a new accumulator which is passed to the next call. <span class="code">Acc0</span> is returned if the table is empty.</p> </p></div> <p><a name="from_ets-2"><span class="bold_code">from_ets(Name, EtsTab) -> ok | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">EtsTab = - see ets(3) -</span><br> </div> </div> <div class="REFBODY"><p> <p>Deletes all objects of the table <span class="code">Name</span> and then inserts all the objects of the Ets table <span class="code">EtsTab</span>. The order in which the objects are inserted is not specified. Since <span class="code">ets:safe_fixtable/2</span> is called the Ets table must be public or owned by the calling process.</p> </p></div> <p><a name="info-1"><span class="bold_code">info(Name) -> InfoList | undefined</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">InfoList = [{Item, Value}]</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns information about the table <span class="code">Name</span> as a list of <span class="code">{Item, Value}</span> tuples:</p> <ul> <li> <p><span class="code">{file_size, int()}</span>, the size of the file in bytes.</p> </li> <li> <p><span class="code">{filename, file()}</span>, the name of the file where objects are stored.</p> </li> <li> <p><span class="code">{keypos, keypos()}</span>, the position of the key.</p> </li> <li> <p><span class="code">{size, int()}</span>, the number of objects stored in the table.</p> </li> <li> <p><span class="code">{type, type()}</span>, the type of the table.</p> </li> </ul> </p></div> <p><a name="info-2"><span class="bold_code">info(Name, Item) -> Value | undefined</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns the information associated with <span class="code">Item</span> for the table <span class="code">Name</span>. In addition to the <span class="code">{Item, Value}</span> pairs defined for <span class="code">info/1</span>, the following items are allowed:</p> <ul> <li> <p><span class="code">{access, access()}</span>, the access mode.</p> </li> <li> <p><span class="code">{auto_save, auto_save()}</span>, the auto save interval.</p> </li> <li> <p><span class="code">{bchunk_format, binary()}</span>, an opaque binary describing the format of the objects returned by <span class="code">bchunk/2</span>. The binary can be used as argument to <span class="code">is_compatible_chunk_format/2</span>. Only available for version 9 tables.</p> </li> <li> <p><span class="code">{hash,</span> Hash<span class="code">}</span>. Describes which BIF is used to calculate the hash values of the objects stored in the Dets table. Possible values of Hash are <span class="code">hash</span>, which implies that the <span class="code">erlang:hash/2</span> BIF is used, <span class="code">phash</span>, which implies that the <span class="code">erlang:phash/2</span> BIF is used, and <span class="code">phash2</span>, which implies that the <span class="code">erlang:phash2/1</span> BIF is used.</p> </li> <li> <p><span class="code">{memory, int()}</span>, the size of the file in bytes. The same value is associated with the item <span class="code">file_size</span>.</p> </li> <li> <p><span class="code">{no_keys, int()}</span>, the number of different keys stored in the table. Only available for version 9 tables.</p> </li> <li> <p><span class="code">{no_objects, int()}</span>, the number of objects stored in the table.</p> </li> <li> <p><span class="code">{no_slots, {Min, Used, Max}}</span>, the number of slots of the table. <span class="code">Min</span> is the minimum number of slots, <span class="code">Used</span> is the number of currently used slots, and <span class="code">Max</span> is the maximum number of slots. Only available for version 9 tables.</p> </li> <li> <p><span class="code">{owner, pid()}</span>, the pid of the process that handles requests to the Dets table.</p> </li> <li> <p><span class="code">{ram_file, bool()}</span>, whether the table is kept in RAM.</p> </li> <li> <p><span class="code">{safe_fixed,</span> SafeFixed<span class="code">}</span>. If the table is fixed, SafeFixed is a tuple <span class="code">{FixedAtTime, [{Pid,RefCount}]}</span>. <span class="code">FixedAtTime</span> is the time when the table was first fixed, and <span class="code">Pid</span> is the pid of the process that fixes the table <span class="code">RefCount</span> times. There may be any number of processes in the list. If the table is not fixed, SafeFixed is the atom <span class="code">false</span>.</p> </li> <li> <p><span class="code">{version, int()}</span>, the version of the format of the table.</p> </li> </ul> </p></div> <p><a name="init_table-2"><span class="bold_code">init_table(Name, InitFun [, Options]) -> ok | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = atom()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">InitFun = fun(Arg) -> Res</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Arg = read | close</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Res = end_of_input | {[object()], InitFun} | {Data, InitFun} | term()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Data = binary() | tuple()</span><br> </div> </div> <div class="REFBODY"><p> <p>Replaces the existing objects of the table <span class="code">Name</span> with objects created by calling the input function <span class="code">InitFun</span>, see below. The reason for using this function rather than calling <span class="code">insert/2</span> is that of efficiency. It should be noted that the input functions are called by the process that handles requests to the Dets table, not by the calling process.</p> <p>When called with the argument <span class="code">read</span> the function <span class="code">InitFun</span> is assumed to return <span class="code">end_of_input</span> when there is no more input, or <span class="code">{Objects, Fun}</span>, where <span class="code">Objects</span> is a list of objects and <span class="code">Fun</span> is a new input function. Any other value Value is returned as an error <span class="code">{error, {init_fun, Value}}</span>. Each input function will be called exactly once, and should an error occur, the last function is called with the argument <span class="code">close</span>, the reply of which is ignored.</p> <p>If the type of the table is <span class="code">set</span> and there is more than one object with a given key, one of the objects is chosen. This is not necessarily the last object with the given key in the sequence of objects returned by the input functions. Duplicate keys should be avoided, or the file will be unnecessarily fragmented. This holds also for duplicated objects stored in tables of type <span class="code">bag</span>.</p> <p>It is important that the table has a sufficient number of slots for the objects. If not, the hash list will start to grow when <span class="code">init_table/2</span> returns which will significantly slow down access to the table for a period of time. The minimum number of slots is set by the <span class="code">open_file/2</span> option <span class="code">min_no_slots</span> and returned by the <span class="code">info/2</span> item <span class="code">no_slots</span>. See also the <span class="code">min_no_slots</span> option below. </p> <p>The <span class="code">Options</span> argument is a list of <span class="code">{Key, Val}</span> tuples where the following values are allowed:</p> <ul> <li> <p><span class="code">{min_no_slots, no_slots()}</span>. Specifies the estimated number of different keys that will be stored in the table. The <span class="code">open_file</span> option with the same name is ignored unless the table is created, and in that case performance can be enhanced by supplying an estimate when initializing the table.</p> </li> <li> <p><span class="code">{format, Format}</span>. Specifies the format of the objects returned by the function <span class="code">InitFun</span>. If <span class="code">Format</span> is <span class="code">term</span> (the default), <span class="code">InitFun</span> is assumed to return a list of tuples. If <span class="code">Format</span> is <span class="code">bchunk</span>, <span class="code">InitFun</span> is assumed to return <span class="code">Data</span> as returned by <span class="code">bchunk/2</span>. This option overrides the <span class="code">min_no_slots</span> option.</p> </li> </ul> </p></div> <p><a name="insert-2"><span class="bold_code">insert(Name, Objects) -> ok | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Objects = object() | [object()]</span><br> </div> </div> <div class="REFBODY"><p> <p>Inserts one or more objects into the table <span class="code">Name</span>. If there already exists an object with a key matching the key of some of the given objects and the table type is <span class="code">set</span>, the old object will be replaced.</p> </p></div> <p><a name="insert_new-2"><span class="bold_code">insert_new(Name, Objects) -> Bool</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Objects = object() | [object()]</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Bool = bool()</span><br> </div> </div> <div class="REFBODY"><p> <p>Inserts one or more objects into the table <span class="code">Name</span>. If there already exists some object with a key matching the key of any of the given objects the table is not updated and <span class="code">false</span> is returned, otherwise the objects are inserted and <span class="code">true</span> returned.</p> </p></div> <p><a name="is_compatible_bchunk_format-2"><span class="bold_code">is_compatible_bchunk_format(Name, BchunkFormat) -> Bool</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">BchunkFormat = binary()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Bool = bool()</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns <span class="code">true</span> if it would be possible to initialize the table <span class="code">Name</span>, using <span class="code">init_table/3</span> with the option <span class="code">{format, bchunk}</span>, with objects read with <span class="code">bchunk/2</span> from some table <span class="code">T</span> such that calling <span class="code">info(T, bchunk_format)</span> returns <span class="code">BchunkFormat</span>.</p> </p></div> <p><a name="is_dets_file-1"><span class="bold_code">is_dets_file(FileName) -> Bool | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">FileName = file()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Bool = bool()</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns <span class="code">true</span> if the file <span class="code">FileName</span> is a Dets table, <span class="code">false</span> otherwise.</p> </p></div> <p><a name="lookup-2"><span class="bold_code">lookup(Name, Key) -> [Object] | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Key = term()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Object = object()</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns a list of all objects with the key <span class="code">Key</span> stored in the table <span class="code">Name</span>. For example:</p> <div class="example"><pre> 2> <span class="bold_code">dets:open_file(abc, [{type, bag}]).</span> {ok,abc} 3> <span class="bold_code">dets:insert(abc, {1,2,3}).</span> ok 4> <span class="bold_code">dets:insert(abc, {1,3,4}).</span> ok 5> <span class="bold_code">dets:lookup(abc, 1).</span> [{1,2,3},{1,3,4}] </pre></div> <p>If the table is of type <span class="code">set</span>, the function returns either the empty list or a list with one object, as there cannot be more than one object with a given key. If the table is of type <span class="code">bag</span> or <span class="code">duplicate_bag</span>, the function returns a list of arbitrary length.</p> <p>Note that the order of objects returned is unspecified. In particular, the order in which objects were inserted is not reflected.</p> </p></div> <p><a name="match-1"><span class="bold_code">match(Continuation) -> {[Match], Continuation2} | '$end_of_table' | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Continuation = Continuation2 = bindings_cont()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Match = [term()]</span><br> </div> </div> <div class="REFBODY"><p> <p>Matches some objects stored in a table and returns a non-empty list of the bindings that match a given pattern in some unspecified order. The table, the pattern, and the number of objects that are matched are all defined by <span class="code">Continuation</span>, which has been returned by a prior call to <span class="code">match/1</span> or <span class="code">match/3</span>.</p> <p>When all objects of the table have been matched, <span class="code">'$end_of_table'</span> is returned.</p> </p></div> <p><a name="match-2"><span class="bold_code">match(Name, Pattern) -> [Match] | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Pattern = tuple()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Match = [term()]</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns for each object of the table <span class="code">Name</span> that matches <span class="code">Pattern</span> a list of bindings in some unspecified order. See <span class="bold_code"><a href="ets.html">ets(3)</a></span> for a description of patterns. If the keypos'th element of <span class="code">Pattern</span> is unbound, all objects of the table are matched. If the keypos'th element is bound, only the objects with the right key are matched.</p> </p></div> <p><a name="match-3"><span class="bold_code">match(Name, Pattern, N) -> {[Match], Continuation} | '$end_of_table' | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Pattern = tuple()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">N = default | int()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Match = [term()]</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Continuation = bindings_cont()</span><br> </div> </div> <div class="REFBODY"><p> <p>Matches some or all objects of the table <span class="code">Name</span> and returns a non-empty list of the bindings that match <span class="code">Pattern</span> in some unspecified order. See <span class="bold_code"><a href="ets.html">ets(3)</a></span> for a description of patterns.</p> <p>A tuple of the bindings and a continuation is returned, unless the table is empty, in which case <span class="code">'$end_of_table'</span> is returned. The continuation is to be used when matching further objects by calling <span class="code">match/1</span>.</p> <p>If the keypos'th element of <span class="code">Pattern</span> is bound, all objects of the table are matched. If the keypos'th element is unbound, all objects of the table are matched, <span class="code">N</span> objects at a time, until at least one object matches or the end of the table has been reached. The default, indicated by giving <span class="code">N</span> the value <span class="code">default</span>, is to let the number of objects vary depending on the sizes of the objects. If <span class="code">Name</span> is a version 9 table, all objects with the same key are always matched at the same time which implies that more than N objects may sometimes be matched. </p> <p>The table should always be protected using <span class="code">safe_fixtable/2</span> before calling <span class="code">match/3</span>, or errors may occur when calling <span class="code">match/1</span>.</p> </p></div> <p><a name="match_delete-2"><span class="bold_code">match_delete(Name, Pattern) -> ok | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Pattern = tuple()</span><br> </div> </div> <div class="REFBODY"><p> <p>Deletes all objects that match <span class="code">Pattern</span> from the table <span class="code">Name</span>. See <span class="bold_code"><a href="ets.html#match-2">ets:match/2</a></span> for a description of patterns.</p> <p>If the keypos'th element of <span class="code">Pattern</span> is bound, only the objects with the right key are matched.</p> </p></div> <p><a name="match_object-1"><span class="bold_code">match_object(Continuation) -> {[Object], Continuation2} | '$end_of_table' | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Continuation = Continuation2 = object_cont()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Object = object()</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns a non-empty list of some objects stored in a table that match a given pattern in some unspecified order. The table, the pattern, and the number of objects that are matched are all defined by <span class="code">Continuation</span>, which has been returned by a prior call to <span class="code">match_object/1</span> or <span class="code">match_object/3</span>.</p> <p>When all objects of the table have been matched, <span class="code">'$end_of_table'</span> is returned.</p> </p></div> <p><a name="match_object-2"><span class="bold_code">match_object(Name, Pattern) -> [Object] | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Pattern = tuple()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Object = object()</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns a list of all objects of the table <span class="code">Name</span> that match <span class="code">Pattern</span> in some unspecified order. See <span class="bold_code"><a href="ets.html">ets(3)</a></span> for a description of patterns. </p> <p>If the keypos'th element of <span class="code">Pattern</span> is unbound, all objects of the table are matched. If the keypos'th element of <span class="code">Pattern</span> is bound, only the objects with the right key are matched.</p> <p>Using the <span class="code">match_object</span> functions for traversing all objects of a table is more efficient than calling <span class="code">first/1</span> and <span class="code">next/2</span> or <span class="code">slot/2</span>.</p> </p></div> <p><a name="match_object-3"><span class="bold_code">match_object(Name, Pattern, N) -> {[Object], Continuation} | '$end_of_table' | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Pattern = tuple()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">N = default | int()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Object = object()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Continuation = object_cont()</span><br> </div> </div> <div class="REFBODY"><p> <p>Matches some or all objects stored in the table <span class="code">Name</span> and returns a non-empty list of the objects that match <span class="code">Pattern</span> in some unspecified order. See <span class="bold_code"><a href="ets.html">ets(3)</a></span> for a description of patterns.</p> <p>A list of objects and a continuation is returned, unless the table is empty, in which case <span class="code">'$end_of_table'</span> is returned. The continuation is to be used when matching further objects by calling <span class="code">match_object/1</span>.</p> <p>If the keypos'th element of <span class="code">Pattern</span> is bound, all objects of the table are matched. If the keypos'th element is unbound, all objects of the table are matched, <span class="code">N</span> objects at a time, until at least one object matches or the end of the table has been reached. The default, indicated by giving <span class="code">N</span> the value <span class="code">default</span>, is to let the number of objects vary depending on the sizes of the objects. If <span class="code">Name</span> is a version 9 table, all matching objects with the same key are always returned in the same reply which implies that more than N objects may sometimes be returned. </p> <p>The table should always be protected using <span class="code">safe_fixtable/2</span> before calling <span class="code">match_object/3</span>, or errors may occur when calling <span class="code">match_object/1</span>.</p> </p></div> <p><a name="member-2"><span class="bold_code">member(Name, Key) -> Bool | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Key = term()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Bool = bool()</span><br> </div> </div> <div class="REFBODY"><p> <p>Works like <span class="code">lookup/2</span>, but does not return the objects. The function returns <span class="code">true</span> if one or more elements of the table has the key <span class="code">Key</span>, <span class="code">false</span> otherwise.</p> </p></div> <p><a name="next-2"><span class="bold_code">next(Name, Key1) -> Key2 | '$end_of_table'</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Key1 = Key2 = term()</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns the key following <span class="code">Key1</span> in the table <span class="code">Name</span> according to the table's internal order, or <span class="code">'$end_of_table'</span> if there is no next key.</p> <p>Should an error occur, the process is exited with an error tuple <span class="code">{error, Reason}</span>.</p> <p>Use <span class="code">first/1</span> to find the first key in the table.</p> </p></div> <p><a name="open_file-1"><span class="bold_code">open_file(Filename) -> {ok, Reference} | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">FileName = file()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Reference = ref()</span><br> </div> </div> <div class="REFBODY"><p> <p>Opens an existing table. If the table has not been properly closed, it will be repaired. The returned reference is to be used as the name of the table. This function is most useful for debugging purposes.</p> </p></div> <p><a name="open_file-2"><span class="bold_code">open_file(Name, Args) -> {ok, Name} | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = atom()</span><br> </div> </div> <div class="REFBODY"><p> <p>Opens a table. An empty Dets table is created if no file exists.</p> <p>The atom <span class="code">Name</span> is the name of the table. The table name must be provided in all subsequent operations on the table. The name can be used by other processes as well, and several process can share one table. </p> <p>If two processes open the same table by giving the same name and arguments, then the table will have two users. If one user closes the table, it still remains open until the second user closes the table.</p> <p>The <span class="code">Args</span> argument is a list of <span class="code">{Key, Val}</span> tuples where the following values are allowed:</p> <ul> <li> <p><span class="code">{access, access()}</span>. It is possible to open existing tables in read-only mode. A table which is opened in read-only mode is not subjected to the automatic file reparation algorithm if it is later opened after a crash. The default value is <span class="code">read_write</span>.</p> </li> <li> <p><span class="code">{auto_save, auto_save()}</span>, the auto save interval. If the interval is an integer <span class="code">Time</span>, the table is flushed to disk whenever it is not accessed for <span class="code">Time</span> milliseconds. A table that has been flushed will require no reparation when reopened after an uncontrolled emulator halt. If the interval is the atom <span class="code">infinity</span>, auto save is disabled. The default value is 180000 (3 minutes).</p> </li> <li> <p><span class="code">{estimated_no_objects, int()}</span>. Equivalent to the <span class="code">min_no_slots</span> option.</p> </li> <li> <p><span class="code">{file, file()}</span>, the name of the file to be opened. The default value is the name of the table.</p> </li> <li> <p><span class="code">{max_no_slots, no_slots()}</span>, the maximum number of slots that will be used. The default value is 2 M, and the maximal value is 32 M. Note that a higher value may increase the fragmentation of the table, and conversely, that a smaller value may decrease the fragmentation, at the expense of execution time. Only available for version 9 tables.</p> </li> <li> <p><span class="code">{min_no_slots, no_slots()}</span>. Application performance can be enhanced with this flag by specifying, when the table is created, the estimated number of different keys that will be stored in the table. The default value as well as the minimum value is 256.</p> </li> <li> <p><span class="code">{keypos, keypos()}</span>, the position of the element of each object to be used as key. The default value is 1. The ability to explicitly state the key position is most convenient when we want to store Erlang records in which the first position of the record is the name of the record type.</p> </li> <li> <p><span class="code">{ram_file, bool()}</span>, whether the table is to be kept in RAM. Keeping the table in RAM may sound like an anomaly, but can enhance the performance of applications which open a table, insert a set of objects, and then close the table. When the table is closed, its contents are written to the disk file. The default value is <span class="code">false</span>.</p> </li> <li> <p><span class="code">{repair, Value}</span>. <span class="code">Value</span> can be either a <span class="code">bool()</span> or the atom <span class="code">force</span>. The flag specifies whether the Dets server should invoke the automatic file reparation algorithm. The default is <span class="code">true</span>. If <span class="code">false</span> is specified, there is no attempt to repair the file and <span class="code">{error, {needs_repair, FileName}}</span> is returned if the table needs to be repaired.</p> <p>The value <span class="code">force</span> means that a reparation will take place even if the table has been properly closed. This is how to convert tables created by older versions of STDLIB. An example is tables hashed with the deprecated <span class="code">erlang:hash/2</span> BIF. Tables created with Dets from a STDLIB version of 1.8.2 and later use the <span class="code">erlang:phash/2</span> function or the <span class="code">erlang:phash2/1</span> function, which is preferred.</p> <p>The <span class="code">repair</span> option is ignored if the table is already open.</p> </li> <li> <p><span class="code">{type, type()}</span>, the type of the table. The default value is <span class="code">set</span>.</p> </li> <li> <p><span class="code">{version, version()}</span>, the version of the format used for the table. The default value is <span class="code">9</span>. Tables on the format used before OTP R8 can be created by giving the value <span class="code">8</span>. A version 8 table can be converted to a version 9 table by giving the options <span class="code">{version,9}</span> and <span class="code">{repair,force}</span>.</p> </li> </ul> </p></div> <p><a name="pid2name-1"><span class="bold_code">pid2name(Pid) -> {ok, Name} | undefined</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Pid = pid()</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns the name of the table given the pid of a process that handles requests to a table, or <span class="code">undefined</span> if there is no such table.</p> <p>This function is meant to be used for debugging only.</p> </p></div> <p><a name="repair_continuation-2"><span class="bold_code">repair_continuation(Continuation, MatchSpec) -> Continuation2</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Continuation = Continuation2 = select_cont()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">MatchSpec = match_spec()</span><br> </div> </div> <div class="REFBODY"><p> <p>This function can be used to restore an opaque continuation returned by <span class="code">select/3</span> or <span class="code">select/1</span> if the continuation has passed through external term format (been sent between nodes or stored on disk).</p> <p>The reason for this function is that continuation terms contain compiled match specifications and therefore will be invalidated if converted to external term format. Given that the original match specification is kept intact, the continuation can be restored, meaning it can once again be used in subsequent <span class="code">select/1</span> calls even though it has been stored on disk or on another node.</p> <p>See also <span class="code">ets(3)</span> for further explanations and examples. </p> <div class="note"> <div class="label">Note</div> <div class="content"><p> <p>This function is very rarely needed in application code. It is used by Mnesia to implement distributed <span class="code">select/3</span> and <span class="code">select/1</span> sequences. A normal application would either use Mnesia or keep the continuation from being converted to external format.</p> <p>The reason for not having an external representation of compiled match specifications is performance. It may be subject to change in future releases, while this interface will remain for backward compatibility.</p> </p></div> </div> </p></div> <p><a name="safe_fixtable-2"><span class="bold_code">safe_fixtable(Name, Fix)</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Fix = bool()</span><br> </div> </div> <div class="REFBODY"><p> <p>If <span class="code">Fix</span> is <span class="code">true</span>, the table <span class="code">Name</span> is fixed (once more) by the calling process, otherwise the table is released. The table is also released when a fixing process terminates. </p> <p>If several processes fix a table, the table will remain fixed until all processes have released it or terminated. A reference counter is kept on a per process basis, and N consecutive fixes require N releases to release the table.</p> <p>It is not guaranteed that calls to <span class="code">first/1</span>, <span class="code">next/2</span>, select and match functions work as expected even if the table has been fixed; the limited support for concurrency implemented in Ets has not yet been implemented in Dets. Fixing a table currently only disables resizing of the hash list of the table.</p> <p>If objects have been added while the table was fixed, the hash list will start to grow when the table is released which will significantly slow down access to the table for a period of time.</p> </p></div> <p><a name="select-1"><span class="bold_code">select(Continuation) -> {Selection, Continuation2} | '$end_of_table' | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Continuation = Continuation2 = select_cont()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Selection = [term()]</span><br> </div> </div> <div class="REFBODY"><p> <p>Applies a match specification to some objects stored in a table and returns a non-empty list of the results. The table, the match specification, and the number of objects that are matched are all defined by <span class="code">Continuation</span>, which has been returned by a prior call to <span class="code">select/1</span> or <span class="code">select/3</span>.</p> <p>When all objects of the table have been matched, <span class="code">'$end_of_table'</span> is returned.</p> </p></div> <p><a name="select-2"><span class="bold_code">select(Name, MatchSpec) -> Selection | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">MatchSpec = match_spec()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Selection = [term()]</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns the results of applying the match specification <span class="code">MatchSpec</span> to all or some objects stored in the table <span class="code">Name</span>. The order of the objects is not specified. See the ERTS User's Guide for a description of match specifications.</p> <p>If the keypos'th element of <span class="code">MatchSpec</span> is unbound, the match specification is applied to all objects of the table. If the keypos'th element is bound, the match specification is applied to the objects with the right key(s) only.</p> <p>Using the <span class="code">select</span> functions for traversing all objects of a table is more efficient than calling <span class="code">first/1</span> and <span class="code">next/2</span> or <span class="code">slot/2</span>. </p> </p></div> <p><a name="select-3"><span class="bold_code">select(Name, MatchSpec, N) -> {Selection, Continuation} | '$end_of_table' | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">MatchSpec = match_spec()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">N = default | int()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Selection = [term()]</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Continuation = select_cont()</span><br> </div> </div> <div class="REFBODY"><p> <p>Returns the results of applying the match specification <span class="code">MatchSpec</span> to some or all objects stored in the table <span class="code">Name</span>. The order of the objects is not specified. See the ERTS User's Guide for a description of match specifications.</p> <p>A tuple of the results of applying the match specification and a continuation is returned, unless the table is empty, in which case <span class="code">'$end_of_table'</span> is returned. The continuation is to be used when matching further objects by calling <span class="code">select/1</span>.</p> <p>If the keypos'th element of <span class="code">MatchSpec</span> is bound, the match specification is applied to all objects of the table with the right key(s). If the keypos'th element of <span class="code">MatchSpec</span> is unbound, the match specification is applied to all objects of the table, <span class="code">N</span> objects at a time, until at least one object matches or the end of the table has been reached. The default, indicated by giving <span class="code">N</span> the value <span class="code">default</span>, is to let the number of objects vary depending on the sizes of the objects. If <span class="code">Name</span> is a version 9 table, all objects with the same key are always handled at the same time which implies that the match specification may be applied to more than N objects. </p> <p>The table should always be protected using <span class="code">safe_fixtable/2</span> before calling <span class="code">select/3</span>, or errors may occur when calling <span class="code">select/1</span>.</p> </p></div> <p><a name="select_delete-2"><span class="bold_code">select_delete(Name, MatchSpec) -> N | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">MatchSpec = match_spec()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">N = int()</span><br> </div> </div> <div class="REFBODY"><p> <p>Deletes each object from the table <span class="code">Name</span> such that applying the match specification <span class="code">MatchSpec</span> to the object returns the value <span class="code">true</span>. See the ERTS User's Guide for a description of match specifications. Returns the number of deleted objects.</p> <p>If the keypos'th element of <span class="code">MatchSpec</span> is bound, the match specification is applied to the objects with the right key(s) only.</p> </p></div> <p><a name="slot-2"><span class="bold_code">slot(Name, I) -> '$end_of_table' | [Object] | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">I = int()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Object = object()</span><br> </div> </div> <div class="REFBODY"><p> <p>The objects of a table are distributed among slots, starting with slot <span class="code">0</span> and ending with slot n. This function returns the list of objects associated with slot <span class="code">I</span>. If <span class="code">I</span> is greater than n <span class="code">'$end_of_table'</span> is returned.</p> </p></div> <p><a name="sync-1"><span class="bold_code">sync(Name) -> ok | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> </div> <div class="REFBODY"><p> <p>Ensures that all updates made to the table <span class="code">Name</span> are written to disk. This also applies to tables which have been opened with the <span class="code">ram_file</span> flag set to <span class="code">true</span>. In this case, the contents of the RAM file are flushed to disk.</p> <p>Note that the space management data structures kept in RAM, the buddy system, is also written to the disk. This may take some time if the table is fragmented.</p> </p></div> <p><a name="table-1"><span class="bold_code">table(Name [, Options]) -> QueryHandle</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">QueryHandle = - a query handle, see qlc(3) -</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Options = [Option] | Option</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Option = {n_objects, Limit} | {traverse, TraverseMethod}</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Limit = default | integer() >= 1</span><br> </div> <div class="REFTYPES"> <span class="bold_code">TraverseMethod = first_next | select | {select, MatchSpec}</span><br> </div> <div class="REFTYPES"> <span class="bold_code">MatchSpec = match_spec()</span><br> </div> </div> <div class="REFBODY"><p> <p> <a name="qlc_table"></a> Returns a QLC (Query List Comprehension) query handle. The module <span class="code">qlc</span> implements a query language aimed mainly at Mnesia but Ets tables, Dets tables, and lists are also recognized by <span class="code">qlc</span> as sources of data. Calling <span class="code">dets:table/1,2</span> is the means to make the Dets table <span class="code">Name</span> usable to <span class="code">qlc</span>.</p> <p>When there are only simple restrictions on the key position <span class="code">qlc</span> uses <span class="code">dets:lookup/2</span> to look up the keys, but when that is not possible the whole table is traversed. The option <span class="code">traverse</span> determines how this is done:</p> <ul> <li> <p><span class="code">first_next</span>. The table is traversed one key at a time by calling <span class="code">dets:first/1</span> and <span class="code">dets:next/2</span>.</p> </li> <li> <p><span class="code">select</span>. The table is traversed by calling <span class="code">dets:select/3</span> and <span class="code">dets:select/1</span>. The option <span class="code">n_objects</span> determines the number of objects returned (the third argument of <span class="code">select/3</span>). The match specification (the second argument of <span class="code">select/3</span>) is assembled by <span class="code">qlc</span>: simple filters are translated into equivalent match specifications while more complicated filters have to be applied to all objects returned by <span class="code">select/3</span> given a match specification that matches all objects.</p> </li> <li> <p><span class="code">{select, MatchSpec}</span>. As for <span class="code">select</span> the table is traversed by calling <span class="code">dets:select/3</span> and <span class="code">dets:select/1</span>. The difference is that the match specification is explicitly given. This is how to state match specifications that cannot easily be expressed within the syntax provided by <span class="code">qlc</span>.</p> </li> </ul> <p>The following example uses an explicit match specification to traverse the table:</p> <div class="example"><pre> 1> <span class="bold_code">dets:open_file(t, []),</span> <span class="bold_code">ok = dets:insert(t, [{1,a},{2,b},{3,c},{4,d}]),</span> <span class="bold_code">MS = ets:fun2ms(fun({X,Y}) when (X > 1) or (X < 5) -> {Y} end),</span> <span class="bold_code">QH1 = dets:table(t, [{traverse, {select, MS}}]).</span> </pre></div> <p>An example with implicit match specification:</p> <div class="example"><pre> 2> <span class="bold_code">QH2 = qlc:q([{Y} || {X,Y} <- dets:table(t), (X > 1) or (X < 5)]).</span> </pre></div> <p>The latter example is in fact equivalent to the former which can be verified using the function <span class="code">qlc:info/1</span>:</p> <div class="example"><pre> 3> <span class="bold_code">qlc:info(QH1) =:= qlc:info(QH2).</span> true </pre></div> <p><span class="code">qlc:info/1</span> returns information about a query handle, and in this case identical information is returned for the two query handles.</p> </p></div> <p><a name="to_ets-2"><span class="bold_code">to_ets(Name, EtsTab) -> EtsTab | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">EtsTab = - see ets(3) -</span><br> </div> </div> <div class="REFBODY"><p> <p>Inserts the objects of the Dets table <span class="code">Name</span> into the Ets table <span class="code">EtsTab</span>. The order in which the objects are inserted is not specified. The existing objects of the Ets table are kept unless overwritten.</p> </p></div> <p><a name="traverse-2"><span class="bold_code">traverse(Name, Fun) -> Return | {error, Reason}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Fun = fun(Object) -> FunReturn</span><br> </div> <div class="REFTYPES"> <span class="bold_code">FunReturn = continue | {continue, Val} | {done, Value}</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Val = Value = term()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Object = object()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Return = [term()]</span><br> </div> </div> <div class="REFBODY"><p> <p>Applies <span class="code">Fun</span> to each object stored in the table <span class="code">Name</span> in some unspecified order. Different actions are taken depending on the return value of <span class="code">Fun</span>. The following <span class="code">Fun</span> return values are allowed:</p> <dl> <dt><strong><span class="code">continue</span></strong></dt> <dd> <p>Continue to perform the traversal. For example, the following function can be used to print out the contents of a table:</p> <div class="example"><pre> fun(X) -> io:format("~p~n", [X]), continue end. </pre></div> </dd> <dt><strong><span class="code">{continue, Val}</span></strong></dt> <dd> <p>Continue the traversal and accumulate <span class="code">Val</span>. The following function is supplied in order to collect all objects of a table in a list: </p> <div class="example"><pre> fun(X) -> {continue, X} end. </pre></div> </dd> <dt><strong><span class="code">{done, Value}</span></strong></dt> <dd> <p>Terminate the traversal and return <span class="code">[Value | Acc]</span>.</p> </dd> </dl> <p>Any other value returned by <span class="code">Fun</span> terminates the traversal and is immediately returned. </p> </p></div> <p><a name="update_counter-3"><span class="bold_code">update_counter(Name, Key, Increment) -> Result</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Name = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Key = term()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Increment = {Pos, Incr} | Incr</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Pos = Incr = Result = integer()</span><br> </div> </div> <div class="REFBODY"><p> <p>Updates the object with key <span class="code">Key</span> stored in the table <span class="code">Name</span> of type <span class="code">set</span> by adding <span class="code">Incr</span> to the element at the <span class="code">Pos</span>:th position. The new counter value is returned. If no position is specified, the element directly following the key is updated.</p> <p>This functions provides a way of updating a counter, without having to look up an object, update the object by incrementing an element and insert the resulting object into the table again.</p> </p></div> <h3><a name="id2356082">See Also</a></h3> <div class="REFBODY"> <p><span class="bold_code"><a href="ets.html">ets(3)</a></span>, mnesia(3), <span class="bold_code"><a href="qlc.html">qlc(3)</a></span></p> </div> </div> <div class="footer"> <hr> <p>Copyright © 1997-2010 Ericsson AB. All Rights Reserved.</p> </div> </div> </div></body> </html>