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<title>src/Data/Set/Lens.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE Rank2Types #-}</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-cpp'>#ifndef MIN_VERSION_containers</span>
<a name="line-5"></a><span class='hs-cpp'>#define MIN_VERSION_containers(x,y,z) 1</span>
<a name="line-6"></a><span class='hs-cpp'>#endif</span>
<a name="line-7"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-8"></a><span class='hs-comment'>-- |</span>
<a name="line-9"></a><span class='hs-comment'>-- Module : Data.Set.Lens</span>
<a name="line-10"></a><span class='hs-comment'>-- Copyright : (C) 2012-16 Edward Kmett</span>
<a name="line-11"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-12"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-13"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-14"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-17"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-18"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>setmapped</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>setOf</span>
<a name="line-20"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Getter</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Getting</span><span class='hs-layout'>,</span> <span class='hs-varid'>views</span> <span class='hs-layout'>)</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Setter</span> <span class='hs-layout'>(</span> <span class='hs-varid'>setting</span> <span class='hs-layout'>)</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span><span class='hs-varop'>.</span><span class='hs-conid'>Type</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Set</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Set</span>
<a name="line-26"></a>
<a name="line-27"></a>
<a name="line-28"></a><span class='hs-comment'>-- $setup</span>
<a name="line-29"></a><span class='hs-comment'>-- >>> :set -XNoOverloadedStrings</span>
<a name="line-30"></a><span class='hs-comment'>-- >>> import Control.Lens</span>
<a name="line-31"></a>
<a name="line-32"></a><span class='hs-comment'>-- | This 'Setter' can be used to change the type of a 'Set' by mapping</span>
<a name="line-33"></a><span class='hs-comment'>-- the elements to new values.</span>
<a name="line-34"></a><span class='hs-comment'>--</span>
<a name="line-35"></a><span class='hs-comment'>-- Sadly, you can't create a valid 'Traversal' for a 'Set', but you can</span>
<a name="line-36"></a><span class='hs-comment'>-- manipulate it by reading using 'Control.Lens.Fold.folded' and reindexing it via 'setmapped'.</span>
<a name="line-37"></a><span class='hs-comment'>--</span>
<a name="line-38"></a><span class='hs-comment'>-- >>> over setmapped (+1) (fromList [1,2,3,4])</span>
<a name="line-39"></a><span class='hs-comment'>-- fromList [2,3,4,5]</span>
<a name="line-40"></a><span class='hs-cpp'>#if MIN_VERSION_containers(0,5,2)</span>
<a name="line-41"></a><a name="setmapped"></a><span class='hs-definition'>setmapped</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>j</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>IndexPreservingSetter</span> <span class='hs-layout'>(</span><span class='hs-conid'>Set</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Set</span> <span class='hs-varid'>j</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span> <span class='hs-varid'>j</span>
<a name="line-42"></a><span class='hs-cpp'>#else</span>
<a name="line-43"></a><span class='hs-definition'>setmapped</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ord</span> <span class='hs-varid'>i</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>j</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-conid'>Set</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Set</span> <span class='hs-varid'>j</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span> <span class='hs-varid'>j</span>
<a name="line-44"></a><span class='hs-cpp'>#endif</span>
<a name="line-45"></a><span class='hs-definition'>setmapped</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>setting</span> <span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-varid'>map</span>
<a name="line-46"></a><span class='hs-comment'>{-# INLINE setmapped #-}</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="setOf"></a><span class='hs-comment'>-- | Construct a set from a 'Getter', 'Control.Lens.Fold.Fold', 'Control.Lens.Traversal.Traversal', 'Control.Lens.Lens.Lens' or 'Control.Lens.Iso.Iso'.</span>
<a name="line-49"></a><span class='hs-comment'>--</span>
<a name="line-50"></a><span class='hs-comment'>-- >>> setOf folded ["hello","world"]</span>
<a name="line-51"></a><span class='hs-comment'>-- fromList ["hello","world"]</span>
<a name="line-52"></a><span class='hs-comment'>--</span>
<a name="line-53"></a><span class='hs-comment'>-- >>> setOf (folded._2) [("hello",1),("world",2),("!!!",3)]</span>
<a name="line-54"></a><span class='hs-comment'>-- fromList [1,2,3]</span>
<a name="line-55"></a><span class='hs-comment'>--</span>
<a name="line-56"></a><span class='hs-comment'>-- @</span>
<a name="line-57"></a><span class='hs-comment'>-- 'setOf' :: 'Getter' s a -> s -> 'Set' a</span>
<a name="line-58"></a><span class='hs-comment'>-- 'setOf' :: 'Ord' a => 'Fold' s a -> s -> 'Set' a</span>
<a name="line-59"></a><span class='hs-comment'>-- 'setOf' :: 'Iso'' s a -> s -> 'Set' a</span>
<a name="line-60"></a><span class='hs-comment'>-- 'setOf' :: 'Lens'' s a -> s -> 'Set' a</span>
<a name="line-61"></a><span class='hs-comment'>-- 'setOf' :: 'Ord' a => 'Traversal'' s a -> s -> 'Set' a</span>
<a name="line-62"></a><span class='hs-comment'>-- @</span>
<a name="line-63"></a><span class='hs-definition'>setOf</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Getting</span> <span class='hs-layout'>(</span><span class='hs-conid'>Set</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Set</span> <span class='hs-varid'>a</span>
<a name="line-64"></a><span class='hs-definition'>setOf</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>views</span> <span class='hs-varid'>l</span> <span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-varid'>singleton</span>
<a name="line-65"></a><span class='hs-comment'>{-# INLINE setOf #-}</span>
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