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<pre><a name="line-1"></a><span class='hs-comment'>{- arch-tag: Tuple utilities main file
<a name="line-2"></a>Copyright (C) 2004-2006 John Goerzen <jgoerzen@complete.org>
<a name="line-3"></a>
<a name="line-4"></a>This program is free software; you can redistribute it and/or modify
<a name="line-5"></a>it under the terms of the GNU General Public License as published by
<a name="line-6"></a>the Free Software Foundation; either version 2 of the License, or
<a name="line-7"></a>(at your option) any later version.
<a name="line-8"></a>
<a name="line-9"></a>This program is distributed in the hope that it will be useful,
<a name="line-10"></a>but WITHOUT ANY WARRANTY; without even the implied warranty of
<a name="line-11"></a>MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
<a name="line-12"></a>GNU General Public License for more details.
<a name="line-13"></a>
<a name="line-14"></a>You should have received a copy of the GNU General Public License
<a name="line-15"></a>along with this program; if not, write to the Free Software
<a name="line-16"></a>Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
<a name="line-17"></a>-}</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-comment'>{- |
<a name="line-20"></a> Module : Data.Tuple.Utils
<a name="line-21"></a> Copyright : Copyright (C) 2004-2008 John Goerzen
<a name="line-22"></a> License : GNU GPL, version 2 or above
<a name="line-23"></a>
<a name="line-24"></a> Maintainer : John Goerzen <jgoerzen@complete.org>
<a name="line-25"></a> Stability : provisional
<a name="line-26"></a> Portability: portable
<a name="line-27"></a>
<a name="line-28"></a>This module provides various helpful utilities for dealing with lists.
<a name="line-29"></a>
<a name="line-30"></a>Written by Neil Mitchell, <<a href="http://www.cs.york.ac.uk/~ndm/">http://www.cs.york.ac.uk/~ndm/</a>>
<a name="line-31"></a>-}</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Tuple</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span><span class='hs-layout'>(</span>
<a name="line-34"></a> <span class='hs-comment'>-- * Extraction</span>
<a name="line-35"></a> <span class='hs-varid'>fst3</span><span class='hs-layout'>,</span> <span class='hs-varid'>snd3</span><span class='hs-layout'>,</span> <span class='hs-varid'>thd3</span>
<a name="line-36"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-37"></a>
<a name="line-38"></a>
<a name="line-39"></a><a name="fst3"></a><span class='hs-comment'>-- | Take the first item out of a 3 element tuple</span>
<a name="line-40"></a><span class='hs-definition'>fst3</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-41"></a><span class='hs-definition'>fst3</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="snd3"></a><span class='hs-comment'>-- | Take the second item out of a 3 element tuple</span>
<a name="line-44"></a><span class='hs-definition'>snd3</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-45"></a><span class='hs-definition'>snd3</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>b</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="thd3"></a><span class='hs-comment'>-- | Take the third item out of a 3 element tuple</span>
<a name="line-48"></a><span class='hs-definition'>thd3</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</span>
<a name="line-49"></a><span class='hs-definition'>thd3</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span>
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