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Data-Bits-Lens.html
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Data-Bits-Lens.html
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ -->
<title>src/Data/Bits/Lens.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE LiberalTypeSynonyms #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE Rank2Types #-}</span>
<a name="line-4"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-5"></a><span class='hs-comment'>-- |</span>
<a name="line-6"></a><span class='hs-comment'>-- Module : Data.Bits.Lens</span>
<a name="line-7"></a><span class='hs-comment'>-- Copyright : (C) 2012 Edward Kmett</span>
<a name="line-8"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-9"></a><span class='hs-comment'>-- Maintainer : Edward Kmett <ekmett@gmail.com></span>
<a name="line-10"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-11"></a><span class='hs-comment'>-- Portability : LiberalTypeSynonyms</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-14"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Bits</span><span class='hs-varop'>.</span><span class='hs-conid'>Lens</span>
<a name="line-15"></a> <span class='hs-layout'>(</span> <span class='hs-layout'>(</span><span class='hs-varop'>.|.~</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>.&.~</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'><.|.~</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'><.&.~</span><span class='hs-layout'>)</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>.|.=</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>.&.=</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'><.|.=</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'><.&.=</span><span class='hs-layout'>)</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>bitAt</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>bits</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>
<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'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Bits</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'>Functor</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-comment'>-- $setup</span>
<a name="line-27"></a><span class='hs-comment'>-- >>> import Data.Word</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-keyword'>infixr</span> <span class='hs-num'>4</span> <span class='hs-varop'>.|.~</span><span class='hs-layout'>,</span> <span class='hs-varop'>.&.~</span><span class='hs-layout'>,</span> <span class='hs-varop'><.|.~</span><span class='hs-layout'>,</span> <span class='hs-varop'><.&.~</span>
<a name="line-30"></a><span class='hs-keyword'>infix</span> <span class='hs-num'>4</span> <span class='hs-varop'>.|.=</span><span class='hs-layout'>,</span> <span class='hs-varop'>.&.=</span><span class='hs-layout'>,</span> <span class='hs-varop'><.|.=</span><span class='hs-layout'>,</span> <span class='hs-varop'><.&.=</span>
<a name="line-31"></a>
<a name="line-32"></a><a name=".%7c.~"></a><span class='hs-comment'>-- | Bitwise '.|.' the target(s) of a 'Lens' or 'Setter'</span>
<a name="line-33"></a><span class='hs-comment'>--</span>
<a name="line-34"></a><span class='hs-comment'>-- >>> _2 .|.~ 6 $ ("hello",3)</span>
<a name="line-35"></a><span class='hs-comment'>-- ("hello",7)</span>
<a name="line-36"></a><span class='hs-comment'>--</span>
<a name="line-37"></a><span class='hs-comment'>-- @</span>
<a name="line-38"></a><span class='hs-comment'>-- ('.|.~') :: 'Bits' a => 'Setter' s t a a -> a -> s -> t</span>
<a name="line-39"></a><span class='hs-comment'>-- ('.|.~') :: 'Bits' a => 'Iso' s t a a -> a -> s -> t</span>
<a name="line-40"></a><span class='hs-comment'>-- ('.|.~') :: 'Bits' a => 'Lens' s t a a -> a -> s -> t</span>
<a name="line-41"></a><span class='hs-comment'>-- ('.|.~') :: ('Monoid a', 'Bits' a) => 'Traversal' s t a a -> a -> s -> t</span>
<a name="line-42"></a><span class='hs-comment'>-- @</span>
<a name="line-43"></a><span class='hs-layout'>(</span><span class='hs-varop'>.|.~</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bits</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Setting</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></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-varid'>t</span>
<a name="line-44"></a><a name="l"></a><span class='hs-definition'>l</span> <span class='hs-varop'>.|.~</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>over</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-varop'>.|.</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-45"></a><span class='hs-comment'>{-# INLINE (.|.~) #-}</span>
<a name="line-46"></a>
<a name="line-47"></a><a name=".&.~"></a><span class='hs-comment'>-- | Bitwise '.&.' the target(s) of a 'Lens' or 'Setter'</span>
<a name="line-48"></a><span class='hs-comment'>--</span>
<a name="line-49"></a><span class='hs-comment'>-- >>> _2 .&.~ 7 $ ("hello",254)</span>
<a name="line-50"></a><span class='hs-comment'>-- ("hello",6)</span>
<a name="line-51"></a><span class='hs-comment'>--</span>
<a name="line-52"></a><span class='hs-comment'>-- @</span>
<a name="line-53"></a><span class='hs-comment'>-- ('.&.~') :: 'Bits' a => 'Setter' s t a a -> a -> s -> t</span>
<a name="line-54"></a><span class='hs-comment'>-- ('.&.~') :: 'Bits' a => 'Iso' s t a a -> a -> s -> t</span>
<a name="line-55"></a><span class='hs-comment'>-- ('.&.~') :: 'Bits' a => 'Lens' s t a a -> a -> s -> t</span>
<a name="line-56"></a><span class='hs-comment'>-- ('.&.~') :: ('Monoid a', 'Bits' a) => 'Traversal' s t a a -> a -> s -> t</span>
<a name="line-57"></a><span class='hs-comment'>-- @</span>
<a name="line-58"></a><span class='hs-layout'>(</span><span class='hs-varop'>.&.~</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bits</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Setting</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></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-varid'>t</span>
<a name="line-59"></a><span class='hs-definition'>l</span> <span class='hs-varop'>.&.~</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>over</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-varop'>.&.</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-60"></a><span class='hs-comment'>{-# INLINE (.&.~) #-}</span>
<a name="line-61"></a>
<a name="line-62"></a><a name=".&.="></a><span class='hs-comment'>-- | Modify the target(s) of a 'Simple' 'Lens', 'Setter' or 'Traversal' by computing its bitwise '.&.' with another value.</span>
<a name="line-63"></a><span class='hs-comment'>--</span>
<a name="line-64"></a><span class='hs-comment'>-- >>> execState (do _1 .&.= 15; _2 .&.= 3) (7,7)</span>
<a name="line-65"></a><span class='hs-comment'>-- (7,3)</span>
<a name="line-66"></a><span class='hs-comment'>--</span>
<a name="line-67"></a><span class='hs-comment'>-- @</span>
<a name="line-68"></a><span class='hs-comment'>-- ('.&.=') :: ('MonadState' s m, 'Bits' a) => 'Simple' 'Setter' s a -> a -> m ()</span>
<a name="line-69"></a><span class='hs-comment'>-- ('.&.=') :: ('MonadState' s m, 'Bits' a) => 'Simple' 'Iso' s a -> a -> m ()</span>
<a name="line-70"></a><span class='hs-comment'>-- ('.&.=') :: ('MonadState' s m, 'Bits' a) => 'Simple' 'Lens' s a -> a -> m ()</span>
<a name="line-71"></a><span class='hs-comment'>-- ('.&.=') :: ('MonadState' s m, 'Bits' a) => 'Simple' 'Traversal' s a -> a -> m ()</span>
<a name="line-72"></a><span class='hs-comment'>-- @</span>
<a name="line-73"></a><span class='hs-layout'>(</span><span class='hs-varop'>.&.=</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Bits</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Simple</span> <span class='hs-conid'>Setting</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-74"></a><span class='hs-definition'>l</span> <span class='hs-varop'>.&.=</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>modify</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varop'>.&.~</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-75"></a><span class='hs-comment'>{-# INLINE (.&.=) #-}</span>
<a name="line-76"></a>
<a name="line-77"></a><a name=".%7c.="></a><span class='hs-comment'>-- | Modify the target(s) of a 'Simple' 'Lens', 'Setter' or 'Traversal' by computing its bitwise '.|.' with another value.</span>
<a name="line-78"></a><span class='hs-comment'>--</span>
<a name="line-79"></a><span class='hs-comment'>-- >>> execState (do _1 .|.= 15; _2 .|.= 3) (7,7)</span>
<a name="line-80"></a><span class='hs-comment'>-- (15,7)</span>
<a name="line-81"></a><span class='hs-comment'>--</span>
<a name="line-82"></a><span class='hs-comment'>-- @</span>
<a name="line-83"></a><span class='hs-comment'>-- ('.|.=') :: ('MonadState' s m, 'Bits' a) => 'Simple' 'Setter' s a -> a -> m ()</span>
<a name="line-84"></a><span class='hs-comment'>-- ('.|.=') :: ('MonadState' s m, 'Bits' a) => 'Simple' 'Iso' s a -> a -> m ()</span>
<a name="line-85"></a><span class='hs-comment'>-- ('.|.=') :: ('MonadState' s m, 'Bits' a) => 'Simple' 'Lens' s a -> a -> m ()</span>
<a name="line-86"></a><span class='hs-comment'>-- ('.|.=') :: ('MonadState' s m, 'Bits' a) => 'Simple' 'Traversal' s a -> a -> m ()</span>
<a name="line-87"></a><span class='hs-comment'>-- @</span>
<a name="line-88"></a><span class='hs-layout'>(</span><span class='hs-varop'>.|.=</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Bits</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Simple</span> <span class='hs-conid'>Setting</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-89"></a><span class='hs-definition'>l</span> <span class='hs-varop'>.|.=</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>modify</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varop'>.|.~</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-90"></a><span class='hs-comment'>{-# INLINE (.|.=) #-}</span>
<a name="line-91"></a>
<a name="line-92"></a><a name="%3c.%7c.~"></a><span class='hs-comment'>-- | Bitwise '.|.' the target(s) of a 'Lens' (or 'Traversal'), returning the result</span>
<a name="line-93"></a><span class='hs-comment'>-- (or a monoidal summary of all of the results).</span>
<a name="line-94"></a><span class='hs-comment'>--</span>
<a name="line-95"></a><span class='hs-comment'>-- >>> _2 <.|.~ 6 $ ("hello",3)</span>
<a name="line-96"></a><span class='hs-comment'>-- (7,("hello",7))</span>
<a name="line-97"></a><span class='hs-comment'>--</span>
<a name="line-98"></a><span class='hs-comment'>-- @</span>
<a name="line-99"></a><span class='hs-comment'>-- ('<.|.~') :: 'Bits' a => 'Iso' s t a a -> a -> s -> (a, t)</span>
<a name="line-100"></a><span class='hs-comment'>-- ('<.|.~') :: 'Bits' a => 'Lens' s t a a -> a -> s -> (a, t)</span>
<a name="line-101"></a><span class='hs-comment'>-- ('<.|.~') :: ('Bits' a, 'Monoid a) => 'Traversal' s t a a -> a -> s -> (a, t)</span>
<a name="line-102"></a><span class='hs-comment'>-- @</span>
<a name="line-103"></a><span class='hs-layout'>(</span><span class='hs-varop'><.|.~</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bits</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LensLike</span> <span class='hs-layout'>(</span><span class='hs-conid'>(,)</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></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-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-104"></a><span class='hs-definition'>l</span> <span class='hs-varop'><.|.~</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varop'><%~</span> <span class='hs-layout'>(</span><span class='hs-varop'>.|.</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-105"></a><span class='hs-comment'>{-# INLINE (<.|.~) #-}</span>
<a name="line-106"></a>
<a name="line-107"></a><a name="%3c.&.~"></a><span class='hs-comment'>-- | Bitwise '.&.' the target(s) of a 'Lens' or 'Traversal', returning the result</span>
<a name="line-108"></a><span class='hs-comment'>-- (or a monoidal summary of all of the results).</span>
<a name="line-109"></a><span class='hs-comment'>--</span>
<a name="line-110"></a><span class='hs-comment'>-- >>> _2 <.&.~ 7 $ ("hello",254)</span>
<a name="line-111"></a><span class='hs-comment'>-- (6,("hello",6))</span>
<a name="line-112"></a><span class='hs-comment'>--</span>
<a name="line-113"></a><span class='hs-comment'>-- @</span>
<a name="line-114"></a><span class='hs-comment'>-- ('<.&.~') :: 'Bits' a => 'Iso' s t a a -> a -> s -> (a, t)</span>
<a name="line-115"></a><span class='hs-comment'>-- ('<.&.~') :: 'Bits' a => 'Lens' s t a a -> a -> s -> (a, t)</span>
<a name="line-116"></a><span class='hs-comment'>-- ('<.&.~') :: ('Bits' a, 'Monoid a) => 'Traversal' s t a a -> a -> s -> (a, t)</span>
<a name="line-117"></a><span class='hs-comment'>-- @</span>
<a name="line-118"></a><span class='hs-layout'>(</span><span class='hs-varop'><.&.~</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bits</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LensLike</span> <span class='hs-layout'>(</span><span class='hs-conid'>(,)</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></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-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-119"></a><span class='hs-definition'>l</span> <span class='hs-varop'><.&.~</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varop'><%~</span> <span class='hs-layout'>(</span><span class='hs-varop'>.&.</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-120"></a><span class='hs-comment'>{-# INLINE (<.&.~) #-}</span>
<a name="line-121"></a>
<a name="line-122"></a><a name="%3c.&.="></a><span class='hs-comment'>-- | Modify the target(s) of a 'Simple' 'Lens' (or 'Traversal') by computing its bitwise '.&.' with another value,</span>
<a name="line-123"></a><span class='hs-comment'>-- returning the result (or a monoidal summary of all of the results traversed)</span>
<a name="line-124"></a><span class='hs-comment'>--</span>
<a name="line-125"></a><span class='hs-comment'>-- >>> runState (_1 <.&.= 15) (31,0)</span>
<a name="line-126"></a><span class='hs-comment'>-- (15,(15,0))</span>
<a name="line-127"></a><span class='hs-comment'>--</span>
<a name="line-128"></a><span class='hs-comment'>-- @</span>
<a name="line-129"></a><span class='hs-comment'>-- ('<.&.=') :: ('MonadState' s m, 'Bits' a) => 'Simple' 'Lens' s a -> a -> m a</span>
<a name="line-130"></a><span class='hs-comment'>-- ('<.&.=') :: ('MonadState' s m, 'Bits' a, 'Monoid' a) => 'Simple' 'Traversal' s a -> a -> m a</span>
<a name="line-131"></a><span class='hs-comment'>-- @</span>
<a name="line-132"></a><span class='hs-layout'>(</span><span class='hs-varop'><.&.=</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Bits</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>SimpleLensLike</span> <span class='hs-layout'>(</span><span class='hs-conid'>(,)</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'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-133"></a><span class='hs-definition'>l</span> <span class='hs-varop'><.&.=</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varop'><%=</span> <span class='hs-layout'>(</span><span class='hs-varop'>.&.</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-134"></a><span class='hs-comment'>{-# INLINE (<.&.=) #-}</span>
<a name="line-135"></a>
<a name="line-136"></a><a name="%3c.%7c.="></a><span class='hs-comment'>-- | Modify the target(s) of a 'Simple' 'Lens', (or 'Traversal') by computing its bitwise '.|.' with another value,</span>
<a name="line-137"></a><span class='hs-comment'>-- returning the result (or a monoidal summary of all of the results traversed)</span>
<a name="line-138"></a><span class='hs-comment'>--</span>
<a name="line-139"></a><span class='hs-comment'>-- >>> runState (_1 <.|.= 7) (28,0)</span>
<a name="line-140"></a><span class='hs-comment'>-- (31,(31,0))</span>
<a name="line-141"></a><span class='hs-comment'>--</span>
<a name="line-142"></a><span class='hs-comment'>-- @</span>
<a name="line-143"></a><span class='hs-comment'>-- ('<.|.=') :: ('MonadState' s m, 'Bits' a) => 'Simple' 'Lens' s a -> a -> m a</span>
<a name="line-144"></a><span class='hs-comment'>-- ('<.|.=') :: ('MonadState' s m, 'Bits' a, 'Monoid' a) => 'Simple' 'Traversal' s a -> a -> m a</span>
<a name="line-145"></a><span class='hs-comment'>-- @</span>
<a name="line-146"></a><span class='hs-layout'>(</span><span class='hs-varop'><.|.=</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Bits</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>SimpleLensLike</span> <span class='hs-layout'>(</span><span class='hs-conid'>(,)</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'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-147"></a><span class='hs-definition'>l</span> <span class='hs-varop'><.|.=</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-varop'><%=</span> <span class='hs-layout'>(</span><span class='hs-varop'>.|.</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-148"></a><span class='hs-comment'>{-# INLINE (<.|.=) #-}</span>
<a name="line-149"></a>
<a name="line-150"></a><a name="bitAt"></a><span class='hs-comment'>-- | This lens can be used to access the value of the nth bit in a number.</span>
<a name="line-151"></a><span class='hs-comment'>--</span>
<a name="line-152"></a><span class='hs-comment'>-- @'bitAt' n@ is only a legal 'Lens' into @b@ if @0 <= n < 'bitSize' ('undefined' :: b)@</span>
<a name="line-153"></a><span class='hs-comment'>--</span>
<a name="line-154"></a><span class='hs-comment'>-- >>> 16^.bitAt 4</span>
<a name="line-155"></a><span class='hs-comment'>-- True</span>
<a name="line-156"></a><span class='hs-comment'>--</span>
<a name="line-157"></a><span class='hs-comment'>-- >>> 15^.bitAt 4</span>
<a name="line-158"></a><span class='hs-comment'>-- False</span>
<a name="line-159"></a><span class='hs-comment'>--</span>
<a name="line-160"></a><span class='hs-comment'>-- >>> 15 & bitAt 4 .~ True</span>
<a name="line-161"></a><span class='hs-comment'>-- 31</span>
<a name="line-162"></a><span class='hs-comment'>--</span>
<a name="line-163"></a><span class='hs-comment'>-- >>> 16 & bitAt 4 .~ False</span>
<a name="line-164"></a><span class='hs-comment'>-- 0</span>
<a name="line-165"></a><span class='hs-definition'>bitAt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bits</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SimpleIndexedLens</span> <span class='hs-conid'>Int</span> <span class='hs-varid'>b</span> <span class='hs-conid'>Bool</span>
<a name="line-166"></a><span class='hs-definition'>bitAt</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>indexed</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>f</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>testBit</span> <span class='hs-varid'>b</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varop'><&></span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>if</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>setBit</span> <span class='hs-varid'>b</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>clearBit</span> <span class='hs-varid'>b</span> <span class='hs-varid'>n</span>
<a name="line-167"></a><span class='hs-comment'>{-# INLINE bitAt #-}</span>
<a name="line-168"></a>
<a name="line-169"></a><a name="bits"></a><span class='hs-comment'>-- | Traverse over all bits in a numeric type.</span>
<a name="line-170"></a><span class='hs-comment'>--</span>
<a name="line-171"></a><span class='hs-comment'>-- The bit position is available as the index.</span>
<a name="line-172"></a><span class='hs-comment'>--</span>
<a name="line-173"></a><span class='hs-comment'>-- >>> toListOf bits (5 :: Word8)</span>
<a name="line-174"></a><span class='hs-comment'>-- [True,False,True,False,False,False,False,False]</span>
<a name="line-175"></a><span class='hs-comment'>--</span>
<a name="line-176"></a><span class='hs-comment'>-- If you supply this an 'Integer', the result will be an infinite 'Traversal', which</span>
<a name="line-177"></a><span class='hs-comment'>-- can be productively consumed, but not reassembled.</span>
<a name="line-178"></a><span class='hs-definition'>bits</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Num</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-conid'>Bits</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>SimpleIndexedTraversal</span> <span class='hs-conid'>Int</span> <span class='hs-varid'>b</span> <span class='hs-conid'>Bool</span>
<a name="line-179"></a><span class='hs-definition'>bits</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>indexed</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>f</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>let</span>
<a name="line-180"></a> <span class='hs-varid'>g</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>(,)</span> <span class='hs-varid'>n</span> <span class='hs-varop'><$></span> <span class='hs-varid'>f</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>testBit</span> <span class='hs-varid'>b</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-181"></a> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Prelude</span><span class='hs-varop'>.</span><span class='hs-varid'>takeWhile</span> <span class='hs-varid'>hasBit</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>0</span><span class='hs-keyglyph'>..</span><span class='hs-keyglyph'>]</span>
<a name="line-182"></a> <span class='hs-varid'>hasBit</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>complementBit</span> <span class='hs-varid'>b</span> <span class='hs-varid'>n</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>b</span> <span class='hs-comment'>-- test to make sure that complementing this bit actually changes the value</span>
<a name="line-183"></a> <span class='hs-varid'>step</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-layout'>,</span><span class='hs-conid'>True</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>setBit</span> <span class='hs-varid'>r</span> <span class='hs-varid'>n</span>
<a name="line-184"></a> <span class='hs-varid'>step</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>r</span>
<a name="line-185"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>Prelude</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr</span> <span class='hs-varid'>step</span> <span class='hs-num'>0</span> <span class='hs-varop'><$></span> <span class='hs-varid'>traverse</span> <span class='hs-varid'>g</span> <span class='hs-varid'>bs</span>
<a name="line-186"></a><span class='hs-comment'>{-# INLINE bits #-}</span>
</pre></body>
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