<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta name="generator" content="hevea 2.32"> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1"> <link rel="stylesheet" type="text/css" href="manual.css"> <title>7.5  Constants</title> </head> <body> <a href="types.html"><img src="previous_motif.svg" alt="Previous"></a> <a href="language.html"><img src="contents_motif.svg" alt="Up"></a> <a href="patterns.html"><img src="next_motif.svg" alt="Next"></a> <hr> <h2 class="section" id="sec114">7.5  Constants</h2> <p><a id="hevea_manual.kwd11"></a> <a id="hevea_manual.kwd12"></a> <a id="hevea_manual.kwd13"></a> <a id="hevea_manual.kwd14"></a></p><div class="syntax"><table class="display dcenter"><tr class="c019"><td class="dcell"><table class="c001 cellpading0"><tr><td class="c018"> <a class="syntax" id="constant"><span class="c010">constant</span></a></td><td class="c015">::=</td><td class="c017"> <a class="syntax" href="lex.html#integer-literal"><span class="c010">integer-literal</span></a>  </td></tr> <tr><td class="c018"> </td><td class="c015">∣</td><td class="c017"> <a class="syntax" href="lex.html#float-literal"><span class="c010">float-literal</span></a>  </td></tr> <tr><td class="c018"> </td><td class="c015">∣</td><td class="c017"> <a class="syntax" href="lex.html#char-literal"><span class="c010">char-literal</span></a>  </td></tr> <tr><td class="c018"> </td><td class="c015">∣</td><td class="c017"> <a class="syntax" href="lex.html#string-literal"><span class="c010">string-literal</span></a>  </td></tr> <tr><td class="c018"> </td><td class="c015">∣</td><td class="c017"> <a class="syntax" href="names.html#constr"><span class="c010">constr</span></a>  </td></tr> <tr><td class="c018"> </td><td class="c015">∣</td><td class="c017"> <span class="c004">false</span>  </td></tr> <tr><td class="c018"> </td><td class="c015">∣</td><td class="c017"> <span class="c004">true</span>  </td></tr> <tr><td class="c018"> </td><td class="c015">∣</td><td class="c017"> <span class="c004">()</span>  </td></tr> <tr><td class="c018"> </td><td class="c015">∣</td><td class="c017"> <span class="c004">begin</span> <span class="c004">end</span>  </td></tr> <tr><td class="c018"> </td><td class="c015">∣</td><td class="c017"> <span class="c004">[]</span>  </td></tr> <tr><td class="c018"> </td><td class="c015">∣</td><td class="c017"> <span class="c004">[||]</span>  </td></tr> <tr><td class="c018"> </td><td class="c015">∣</td><td class="c017"> <span class="c004">`</span><a class="syntax" href="names.html#tag-name"><span class="c010">tag-name</span></a> </td></tr> </table></td></tr> </table></div><p> See also the following language extensions: <a href="extn.html#s%3Aext-integer">integer literals for types <span class="c003">int32</span>, <span class="c003">int64</span> and <span class="c003">nativeint</span></a>, <a href="extn.html#s%3Aquoted-strings">quoted strings</a> and <a href="extn.html#s%3Aextension-literals">extension literals</a>.</p><p>The syntactic class of constants comprises literals from the four base types (integers, floating-point numbers, characters, character strings), and constant constructors from both normal and polymorphic variants, as well as the special constants <span class="c004">false</span>, <span class="c004">true</span>, <span class="c004">()</span>, <span class="c004">[]</span>, and <span class="c004">[||]</span>, which behave like constant constructors, and <span class="c002"><span class="c003">begin</span> <span class="c003">end</span></span>, which is equivalent to <span class="c004">()</span>. </p> <hr> <a href="types.html"><img src="previous_motif.svg" alt="Previous"></a> <a href="language.html"><img src="contents_motif.svg" alt="Up"></a> <a href="patterns.html"><img src="next_motif.svg" alt="Next"></a> </body> </html>
distrib
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Mageia
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7
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armv7hl
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media
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core-release
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by-pkgid
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fb18813323b88f9a6e869238ab603257
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files
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8
