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<title>src/Data/Array/Lens.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE Rank2Types #-}</span>
<a name="line-2"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : Data.Array.Lens</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (C) 2012-15 Edward Kmett</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : MPTCs, Rank2Types, LiberalTypeSynonyms</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-12"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-13"></a> <span class='hs-layout'>(</span>
<a name="line-14"></a> <span class='hs-comment'>-- * Setters</span>
<a name="line-15"></a> <span class='hs-varid'>ixmapped</span>
<a name="line-16"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span><span class='hs-varop'>.</span><span class='hs-conid'>IArray</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>index</span><span class='hs-layout'>)</span>
<a name="line-20"></a>
<a name="line-21"></a><a name="ixmapped"></a><span class='hs-comment'>-- | This 'setter' can be used to derive a new 'IArray' from an old 'IAarray' by</span>
<a name="line-22"></a><span class='hs-comment'>-- applying a function to each of the indices to look it up in the old 'IArray'.</span>
<a name="line-23"></a><span class='hs-comment'>--</span>
<a name="line-24"></a><span class='hs-comment'>-- This is a /contravariant/ 'Setter'.</span>
<a name="line-25"></a><span class='hs-comment'>--</span>
<a name="line-26"></a><span class='hs-comment'>-- @</span>
<a name="line-27"></a><span class='hs-comment'>-- 'ixmap' ≡ 'over' '.' 'ixmapped'</span>
<a name="line-28"></a><span class='hs-comment'>-- 'ixmapped' ≡ 'setting' '.' 'ixmap'</span>
<a name="line-29"></a><span class='hs-comment'>-- 'over' ('ixmapped' b) f arr '!' i ≡ arr '!' f i</span>
<a name="line-30"></a><span class='hs-comment'>-- 'bounds' ('over' ('ixmapped' b) f arr) ≡ b</span>
<a name="line-31"></a><span class='hs-comment'>-- @</span>
<a name="line-32"></a><span class='hs-definition'>ixmapped</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>IArray</span> <span class='hs-varid'>a</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ix</span> <span class='hs-varid'>i</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ix</span> <span class='hs-varid'>j</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-layout'>,</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IndexPreservingSetter</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varid'>j</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varid'>i</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span> <span class='hs-varid'>j</span>
<a name="line-33"></a><span class='hs-definition'>ixmapped</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>setting</span> <span class='hs-varop'>.</span> <span class='hs-varid'>ixmap</span>
<a name="line-34"></a><span class='hs-comment'>{-# INLINE ixmapped #-}</span>
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