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<title>src/Data/HashSet/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><span class='hs-cpp'>#ifdef TRUSTWORTHY</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE Trustworthy #-}</span>
<a name="line-5"></a><span class='hs-cpp'>#endif</span>
<a name="line-6"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-7"></a><span class='hs-comment'>-- |</span>
<a name="line-8"></a><span class='hs-comment'>-- Module : Data.HashSet.Lens</span>
<a name="line-9"></a><span class='hs-comment'>-- Copyright : (C) 2012-15 Edward Kmett</span>
<a name="line-10"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-11"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-12"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-13"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-16"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>HashSet</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-17"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>setmapped</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>setOf</span>
<a name="line-19"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-20"></a>
<a name="line-21"></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-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'>Setter</span> <span class='hs-layout'>(</span><span class='hs-varid'>setting</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'>Type</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>HashSet</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>HashSet</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'>Hashable</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-comment'>-- $setup</span>
<a name="line-28"></a><span class='hs-comment'>-- >>> :set -XNoOverloadedStrings</span>
<a name="line-29"></a><span class='hs-comment'>-- >>> import Control.Lens</span>
<a name="line-30"></a>
<a name="line-31"></a><a name="setmapped"></a><span class='hs-comment'>-- | This 'Setter' can be used to change the type of a 'HashSet' by mapping</span>
<a name="line-32"></a><span class='hs-comment'>-- the elements to new values.</span>
<a name="line-33"></a><span class='hs-comment'>--</span>
<a name="line-34"></a><span class='hs-comment'>-- Sadly, you can't create a valid 'Traversal' for a 'Set', but you can</span>
<a name="line-35"></a><span class='hs-comment'>-- manipulate it by reading using 'Control.Lens.Fold.folded' and reindexing it via 'setmapped'.</span>
<a name="line-36"></a><span class='hs-definition'>setmapped</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span> <span class='hs-varid'>j</span><span class='hs-layout'>,</span> <span class='hs-conid'>Hashable</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'>HashSet</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>HashSet</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-37"></a><span class='hs-definition'>setmapped</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>setting</span> <span class='hs-conid'>HashSet</span><span class='hs-varop'>.</span><span class='hs-varid'>map</span>
<a name="line-38"></a><span class='hs-comment'>{-# INLINE setmapped #-}</span>
<a name="line-39"></a>
<a name="line-40"></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-41"></a><span class='hs-comment'>--</span>
<a name="line-42"></a><span class='hs-comment'>-- @</span>
<a name="line-43"></a><span class='hs-comment'>-- 'setOf' :: 'Hashable' a => 'Getter' s a -> s -> 'HashSet' a</span>
<a name="line-44"></a><span class='hs-comment'>-- 'setOf' :: ('Eq' a, 'Hashable' a) => 'Fold' s a -> s -> 'HashSet' a</span>
<a name="line-45"></a><span class='hs-comment'>-- 'setOf' :: 'Hashable' a => 'Iso'' s a -> s -> 'HashSet' a</span>
<a name="line-46"></a><span class='hs-comment'>-- 'setOf' :: 'Hashable' a => 'Lens'' s a -> s -> 'HashSet' a</span>
<a name="line-47"></a><span class='hs-comment'>-- 'setOf' :: ('Eq' a, 'Hashable' a) => 'Traversal'' s a -> s -> 'HashSet' a</span>
<a name="line-48"></a><span class='hs-comment'>-- @</span>
<a name="line-49"></a><span class='hs-definition'>setOf</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Hashable</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Getting</span> <span class='hs-layout'>(</span><span class='hs-conid'>HashSet</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'>HashSet</span> <span class='hs-varid'>a</span>
<a name="line-50"></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'>HashSet</span><span class='hs-varop'>.</span><span class='hs-varid'>singleton</span>
<a name="line-51"></a><span class='hs-comment'>{-# INLINE setOf #-}</span>
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