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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="src/Control-Lens-Internal-Context.html">Source</a></li><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">lens-4.13: Lenses, Folds and Traversals</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Copyright</th><td>(C) 2012-2015 Edward Kmett</td></tr><tr><th>License</th><td>BSD-style (see the file LICENSE)</td></tr><tr><th>Maintainer</th><td>Edward Kmett <ekmett@gmail.com></td></tr><tr><th>Stability</th><td>experimental</td></tr><tr><th>Portability</th><td>non-portable</td></tr><tr><th>Safe Haskell</th><td>Safe</td></tr><tr><th>Language</th><td>Haskell98</td></tr></table><p class="caption">Control.Lens.Internal.Context</p></div><div id="description"><p class="caption">Description</p><div class="doc empty"> </div></div><div id="synopsis"><p id="control.syn" class="caption expander" onclick="toggleSection('syn')">Synopsis</p><ul id="section.syn" class="hide" onclick="toggleSection('syn')"><li class="src short"><span class="keyword">class</span> <a href="#t:IndexedFunctor">IndexedFunctor</a> w <span class="keyword">where</span><ul class="subs"><li><a href="#v:ifmap">ifmap</a> :: (s -> t) -> w a b s -> w a b t</li></ul></li><li class="src short"><span class="keyword">class</span> <a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> w => <a href="#t:IndexedComonad">IndexedComonad</a> w <span class="keyword">where</span><ul class="subs"><li><a href="#v:iextract">iextract</a> :: w a a t -> t</li><li><a href="#v:iduplicate">iduplicate</a> :: w a c t -> w a b (w b c t)</li><li><a href="#v:iextend">iextend</a> :: (w b c t -> r) -> w a c t -> w a b r</li></ul></li><li class="src short"><span class="keyword">class</span> <a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a> w => <a href="#t:IndexedComonadStore">IndexedComonadStore</a> w <span class="keyword">where</span><ul class="subs"><li><a href="#v:ipos">ipos</a> :: w a c t -> a</li><li><a href="#v:ipeek">ipeek</a> :: c -> w a c t -> t</li><li><a href="#v:ipeeks">ipeeks</a> :: (a -> c) -> w a c t -> t</li><li><a href="#v:iseek">iseek</a> :: b -> w a c t -> w b c t</li><li><a href="#v:iseeks">iseeks</a> :: (a -> b) -> w a c t -> w b c t</li><li><a href="#v:iexperiment">iexperiment</a> :: <a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.8.2.0/Data-Functor.html#t:Functor">Functor</a> f => (b -> f c) -> w b c t -> f t</li><li><a href="#v:context">context</a> :: w a b t -> <a href="Control-Lens-Internal-Context.html#t:Context">Context</a> a b t</li></ul></li><li class="src short"><span class="keyword">class</span> <a href="file:///usr/share/doc/libghc-profunctors-doc/html/Data-Profunctor-Rep.html#t:Corepresentable">Corepresentable</a> p => <a href="#t:Sellable">Sellable</a> p w | w -> p <span class="keyword">where</span><ul class="subs"><li><a href="#v:sell">sell</a> :: p a (w a b b)</li></ul></li><li class="src short"><span class="keyword">data</span> <a href="#t:Context">Context</a> a b t = <a href="#v:Context">Context</a> (b -> t) a</li><li class="src short"><span class="keyword">type</span> <a href="#t:Context-39-">Context'</a> a = <a href="Control-Lens-Internal-Context.html#t:Context">Context</a> a a</li><li class="src short"><span class="keyword">newtype</span> <a href="#t:Pretext">Pretext</a> p a b t = <a href="#v:Pretext">Pretext</a> {<ul class="subs"><li><a href="#v:runPretext">runPretext</a> :: <span class="keyword">forall</span> f. <a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.8.2.0/Data-Functor.html#t:Functor">Functor</a> f => p a (f b) -> f t</li></ul>}</li><li class="src short"><span class="keyword">type</span> <a href="#t:Pretext-39-">Pretext'</a> p a = <a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a> p a a</li><li class="src short"><span class="keyword">newtype</span> <a href="#t:PretextT">PretextT</a> p g a b t = <a href="#v:PretextT">PretextT</a> {<ul class="subs"><li><a href="#v:runPretextT">runPretextT</a> :: <span class="keyword">forall</span> f. <a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.8.2.0/Data-Functor.html#t:Functor">Functor</a> f => p a (f b) -> f t</li></ul>}</li><li class="src short"><span class="keyword">type</span> <a href="#t:PretextT-39-">PretextT'</a> p g a = <a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g a a</li></ul></div><div id="interface"><h1>Documentation</h1><div class="top"><p class="src"><span class="keyword">class</span> <a name="t:IndexedFunctor" class="def">IndexedFunctor</a> w <span class="keyword">where</span> <a href="src/Control-Lens-Internal-Context.html#IndexedFunctor" class="link">Source</a></p><div class="doc"><p>This is a Bob Atkey -style 2-argument indexed functor.</p><p>It exists as a superclass for <code><a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a></code> and expresses the functoriality
of an <code><a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a></code> in its third argument.</p></div><div class="subs methods"><p class="caption">Methods</p><p class="src"><a name="v:ifmap" class="def">ifmap</a> :: (s -> t) -> w a b s -> w a b t <a href="src/Control-Lens-Internal-Context.html#ifmap" class="link">Source</a></p></div><div class="subs instances"><p id="control.i:IndexedFunctor" class="caption collapser" onclick="toggleSection('i:IndexedFunctor')">Instances</p><div id="section.i:IndexedFunctor" class="show"><table><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> <a href="Control-Lens-Internal-Context.html#t:Context">Context</a></span> <a href="src/Control-Lens-Internal-Context.html#line-148" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> <a href="Control-Lens-Internal-Magma.html#t:Mafic">Mafic</a></span> <a href="src/Control-Lens-Internal-Context.html#line-206" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> (<a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-222" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> (<a href="Control-Lens-Internal-Bazaar.html#t:Bazaar1">Bazaar1</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-244" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> (<a href="Control-Lens-Internal-Bazaar.html#t:Bazaar">Bazaar</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-88" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> (<a href="Control-Lens-Internal-Magma.html#t:Molten">Molten</a> i)</span> <a href="src/Control-Lens-Internal-Context.html#line-138" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> (<a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-302" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> (<a href="Control-Lens-Internal-Bazaar.html#t:BazaarT1">BazaarT1</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-301" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> (<a href="Control-Lens-Internal-Bazaar.html#t:BazaarT">BazaarT</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-151" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> (<a href="Control-Lens-Internal-Magma.html#t:TakingWhile">TakingWhile</a> p f)</span> <a href="src/Control-Lens-Internal-Context.html#line-259" class="link">Source</a></td><td class="doc empty"> </td></tr></table></div></div></div><div class="top"><p class="src"><span class="keyword">class</span> <a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> w => <a name="t:IndexedComonad" class="def">IndexedComonad</a> w <span class="keyword">where</span> <a href="src/Control-Lens-Internal-Context.html#IndexedComonad" class="link">Source</a></p><div class="doc"><p>This is a Bob Atkey -style 2-argument indexed comonad.</p><p>It exists as a superclass for <code><a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a></code> and expresses the functoriality
of an <code><a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a></code> in its third argument.</p><p>The notion of indexed monads is covered in more depth in Bob Atkey's
"Parameterized Notions of Computation" <a href="http://bentnib.org/paramnotions-jfp.pdf">http://bentnib.org/paramnotions-jfp.pdf</a>
and that construction is dualized here.</p></div><div class="subs minimal"><p class="caption">Minimal complete definition</p><p class="src"><a href="Control-Lens-Internal-Context.html#v:iextract">iextract</a></p></div><div class="subs methods"><p class="caption">Methods</p><p class="src"><a name="v:iextract" class="def">iextract</a> :: w a a t -> t <a href="src/Control-Lens-Internal-Context.html#iextract" class="link">Source</a></p><div class="doc"><p>extract from an indexed comonadic value when the indices match.</p></div><p class="src"><a name="v:iduplicate" class="def">iduplicate</a> :: w a c t -> w a b (w b c t) <a href="src/Control-Lens-Internal-Context.html#iduplicate" class="link">Source</a></p><div class="doc"><p>duplicate an indexed comonadic value splitting the index.</p></div><p class="src"><a name="v:iextend" class="def">iextend</a> :: (w b c t -> r) -> w a c t -> w a b r <a href="src/Control-Lens-Internal-Context.html#iextend" class="link">Source</a></p><div class="doc"><p>extend a indexed comonadic computation splitting the index.</p></div></div><div class="subs instances"><p id="control.i:IndexedComonad" class="caption collapser" onclick="toggleSection('i:IndexedComonad')">Instances</p><div id="section.i:IndexedComonad" class="show"><table><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a> <a href="Control-Lens-Internal-Context.html#t:Context">Context</a></span> <a href="src/Control-Lens-Internal-Context.html#line-152" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p => <a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a> (<a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-230" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p => <a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a> (<a href="Control-Lens-Internal-Bazaar.html#t:Bazaar1">Bazaar1</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-248" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p => <a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a> (<a href="Control-Lens-Internal-Bazaar.html#t:Bazaar">Bazaar</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-92" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a> (<a href="Control-Lens-Internal-Magma.html#t:Molten">Molten</a> i)</span> <a href="src/Control-Lens-Internal-Context.html#line-142" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p => <a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a> (<a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-310" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p => <a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a> (<a href="Control-Lens-Internal-Bazaar.html#t:BazaarT1">BazaarT1</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-305" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p => <a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a> (<a href="Control-Lens-Internal-Bazaar.html#t:BazaarT">BazaarT</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-155" class="link">Source</a></td><td class="doc empty"> </td></tr></table></div></div></div><div class="top"><p class="src"><span class="keyword">class</span> <a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a> w => <a name="t:IndexedComonadStore" class="def">IndexedComonadStore</a> w <span class="keyword">where</span> <a href="src/Control-Lens-Internal-Context.html#IndexedComonadStore" class="link">Source</a></p><div class="doc"><p>This is an indexed analogue to <code><a href="file:///usr/share/doc/libghc-comonad-doc/html/Control-Comonad-Store-Class.html#t:ComonadStore">ComonadStore</a></code> for when you are working with an
<code><a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a></code>.</p></div><div class="subs minimal"><p class="caption">Minimal complete definition</p><p class="src"><a href="Control-Lens-Internal-Context.html#v:ipos">ipos</a>, <a href="Control-Lens-Internal-Context.html#v:iseek">iseek</a>, <a href="Control-Lens-Internal-Context.html#v:iseeks">iseeks</a></p></div><div class="subs methods"><p class="caption">Methods</p><p class="src"><a name="v:ipos" class="def">ipos</a> :: w a c t -> a <a href="src/Control-Lens-Internal-Context.html#ipos" class="link">Source</a></p><div class="doc"><p>This is the generalization of <code><a href="file:///usr/share/doc/libghc-comonad-doc/html/Control-Comonad-Store-Class.html#v:pos">pos</a></code> to an indexed comonad store.</p></div><p class="src"><a name="v:ipeek" class="def">ipeek</a> :: c -> w a c t -> t <a href="src/Control-Lens-Internal-Context.html#ipeek" class="link">Source</a></p><div class="doc"><p>This is the generalization of <code><a href="file:///usr/share/doc/libghc-comonad-doc/html/Control-Comonad-Store-Class.html#v:peek">peek</a></code> to an indexed comonad store.</p></div><p class="src"><a name="v:ipeeks" class="def">ipeeks</a> :: (a -> c) -> w a c t -> t <a href="src/Control-Lens-Internal-Context.html#ipeeks" class="link">Source</a></p><div class="doc"><p>This is the generalization of <code><a href="file:///usr/share/doc/libghc-comonad-doc/html/Control-Comonad-Store-Class.html#v:peeks">peeks</a></code> to an indexed comonad store.</p></div><p class="src"><a name="v:iseek" class="def">iseek</a> :: b -> w a c t -> w b c t <a href="src/Control-Lens-Internal-Context.html#iseek" class="link">Source</a></p><div class="doc"><p>This is the generalization of <code><a href="file:///usr/share/doc/libghc-comonad-doc/html/Control-Comonad-Store-Class.html#v:seek">seek</a></code> to an indexed comonad store.</p></div><p class="src"><a name="v:iseeks" class="def">iseeks</a> :: (a -> b) -> w a c t -> w b c t <a href="src/Control-Lens-Internal-Context.html#iseeks" class="link">Source</a></p><div class="doc"><p>This is the generalization of <code><a href="file:///usr/share/doc/libghc-comonad-doc/html/Control-Comonad-Store-Class.html#v:seeks">seeks</a></code> to an indexed comonad store.</p></div><p class="src"><a name="v:iexperiment" class="def">iexperiment</a> :: <a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.8.2.0/Data-Functor.html#t:Functor">Functor</a> f => (b -> f c) -> w b c t -> f t <a href="src/Control-Lens-Internal-Context.html#iexperiment" class="link">Source</a></p><div class="doc"><p>This is the generalization of <code><a href="file:///usr/share/doc/libghc-comonad-doc/html/Control-Comonad-Store-Class.html#v:experiment">experiment</a></code> to an indexed comonad store.</p></div><p class="src"><a name="v:context" class="def">context</a> :: w a b t -> <a href="Control-Lens-Internal-Context.html#t:Context">Context</a> a b t <a href="src/Control-Lens-Internal-Context.html#context" class="link">Source</a></p><div class="doc"><p>We can always forget the rest of the structure of <code>w</code> and obtain a simpler
indexed comonad store model called <code><a href="Control-Lens-Internal-Context.html#t:Context">Context</a></code>.</p></div></div><div class="subs instances"><p id="control.i:IndexedComonadStore" class="caption collapser" onclick="toggleSection('i:IndexedComonadStore')">Instances</p><div id="section.i:IndexedComonadStore" class="show"><table><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedComonadStore">IndexedComonadStore</a> <a href="Control-Lens-Internal-Context.html#t:Context">Context</a></span> <a href="src/Control-Lens-Internal-Context.html#line-160" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p => <a href="Control-Lens-Internal-Context.html#t:IndexedComonadStore">IndexedComonadStore</a> (<a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-242" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p => <a href="Control-Lens-Internal-Context.html#t:IndexedComonadStore">IndexedComonadStore</a> (<a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-322" class="link">Source</a></td><td class="doc empty"> </td></tr></table></div></div></div><div class="top"><p class="src"><span class="keyword">class</span> <a href="file:///usr/share/doc/libghc-profunctors-doc/html/Data-Profunctor-Rep.html#t:Corepresentable">Corepresentable</a> p => <a name="t:Sellable" class="def">Sellable</a> p w | w -> p <span class="keyword">where</span> <a href="src/Control-Lens-Internal-Context.html#Sellable" class="link">Source</a></p><div class="doc"><p>This is used internally to construct a <code><a href="Control-Lens-Internal-Bazaar.html#v:Bazaar">Bazaar</a></code>, <code><a href="Control-Lens-Internal-Context.html#t:Context">Context</a></code> or <code><a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a></code>
from a singleton value.</p></div><div class="subs methods"><p class="caption">Methods</p><p class="src"><a name="v:sell" class="def">sell</a> :: p a (w a b b) <a href="src/Control-Lens-Internal-Context.html#sell" class="link">Source</a></p></div><div class="subs instances"><p id="control.i:Sellable" class="caption collapser" onclick="toggleSection('i:Sellable')">Instances</p><div id="section.i:Sellable" class="show"><table><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:Sellable">Sellable</a> (->) <a href="Control-Lens-Internal-Context.html#t:Context">Context</a></span> <a href="src/Control-Lens-Internal-Context.html#line-202" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:Sellable">Sellable</a> (->) <a href="Control-Lens-Internal-Magma.html#t:Mafic">Mafic</a></span> <a href="src/Control-Lens-Internal-Context.html#line-193" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="file:///usr/share/doc/libghc-profunctors-doc/html/Data-Profunctor-Rep.html#t:Corepresentable">Corepresentable</a> p => <a href="Control-Lens-Internal-Context.html#t:Sellable">Sellable</a> p (<a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-272" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="file:///usr/share/doc/libghc-profunctors-doc/html/Data-Profunctor-Rep.html#t:Corepresentable">Corepresentable</a> p => <a href="Control-Lens-Internal-Context.html#t:Sellable">Sellable</a> p (<a href="Control-Lens-Internal-Bazaar.html#t:Bazaar1">Bazaar1</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-254" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="file:///usr/share/doc/libghc-profunctors-doc/html/Data-Profunctor-Rep.html#t:Corepresentable">Corepresentable</a> p => <a href="Control-Lens-Internal-Context.html#t:Sellable">Sellable</a> p (<a href="Control-Lens-Internal-Bazaar.html#t:Bazaar">Bazaar</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-98" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="file:///usr/share/doc/libghc-profunctors-doc/html/Data-Profunctor-Rep.html#t:Corepresentable">Corepresentable</a> p => <a href="Control-Lens-Internal-Context.html#t:Sellable">Sellable</a> p (<a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-352" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="file:///usr/share/doc/libghc-profunctors-doc/html/Data-Profunctor-Rep.html#t:Corepresentable">Corepresentable</a> p => <a href="Control-Lens-Internal-Context.html#t:Sellable">Sellable</a> p (<a href="Control-Lens-Internal-Bazaar.html#t:BazaarT1">BazaarT1</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-311" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="file:///usr/share/doc/libghc-profunctors-doc/html/Data-Profunctor-Rep.html#t:Corepresentable">Corepresentable</a> p => <a href="Control-Lens-Internal-Context.html#t:Sellable">Sellable</a> p (<a href="Control-Lens-Internal-Bazaar.html#t:BazaarT">BazaarT</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-161" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:Sellable">Sellable</a> (<a href="Control-Lens-Internal-Indexed.html#t:Indexed">Indexed</a> i) (<a href="Control-Lens-Internal-Magma.html#t:Molten">Molten</a> i)</span> <a href="src/Control-Lens-Internal-Context.html#line-128" class="link">Source</a></td><td class="doc empty"> </td></tr></table></div></div></div><div class="top"><p class="src"><span class="keyword">data</span> <a name="t:Context" class="def">Context</a> a b t <a href="src/Control-Lens-Internal-Context.html#Context" class="link">Source</a></p><div class="doc"><p>The indexed store can be used to characterize a <code><a href="Control-Lens-Lens.html#v:Lens">Lens</a></code>
and is used by <code><a href="Control-Lens-Lens.html#v:clone">clone</a></code>.</p><p><code><code><a href="Control-Lens-Internal-Context.html#t:Context">Context</a></code> a b t</code> is isomorphic to
<code>newtype <code><a href="Control-Lens-Internal-Context.html#t:Context">Context</a></code> a b t = <code><a href="Control-Lens-Internal-Context.html#t:Context">Context</a></code> { runContext :: forall f. <code><a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.8.2.0/Data-Functor.html#t:Functor">Functor</a></code> f => (a -> f b) -> f t }</code>,
and to <code>exists s. (s, <code><a href="Control-Lens-Lens.html#v:Lens">Lens</a></code> s t a b)</code>.</p><p>A <code><a href="Control-Lens-Internal-Context.html#t:Context">Context</a></code> is like a <code><a href="Control-Lens-Lens.html#v:Lens">Lens</a></code> that has already been applied to a some structure.</p></div><div class="subs constructors"><p class="caption">Constructors</p><table><tr><td class="src"><a name="v:Context" class="def">Context</a> (b -> t) a</td><td class="doc empty"> </td></tr></table></div><div class="subs instances"><p id="control.i:Context" class="caption collapser" onclick="toggleSection('i:Context')">Instances</p><div id="section.i:Context" class="show"><table><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedComonadStore">IndexedComonadStore</a> <a href="Control-Lens-Internal-Context.html#t:Context">Context</a></span> <a href="src/Control-Lens-Internal-Context.html#line-160" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a> <a href="Control-Lens-Internal-Context.html#t:Context">Context</a></span> <a href="src/Control-Lens-Internal-Context.html#line-152" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> <a href="Control-Lens-Internal-Context.html#t:Context">Context</a></span> <a href="src/Control-Lens-Internal-Context.html#line-148" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:Sellable">Sellable</a> (->) <a href="Control-Lens-Internal-Context.html#t:Context">Context</a></span> <a href="src/Control-Lens-Internal-Context.html#line-202" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left">(~) * a b => <a href="file:///usr/share/doc/libghc-comonad-doc/html/Control-Comonad-Store-Class.html#t:ComonadStore">ComonadStore</a> a (<a href="Control-Lens-Internal-Context.html#t:Context">Context</a> a b)</span> <a href="src/Control-Lens-Internal-Context.html#line-188" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.8.2.0/Data-Functor.html#t:Functor">Functor</a> (<a href="Control-Lens-Internal-Context.html#t:Context">Context</a> a b)</span> <a href="src/Control-Lens-Internal-Context.html#line-176" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left">(~) * a b => <a href="file:///usr/share/doc/libghc-comonad-doc/html/Control-Comonad.html#t:Comonad">Comonad</a> (<a href="Control-Lens-Internal-Context.html#t:Context">Context</a> a b)</span> <a href="src/Control-Lens-Internal-Context.html#line-180" class="link">Source</a></td><td class="doc empty"> </td></tr></table></div></div></div><div class="top"><p class="src"><span class="keyword">type</span> <a name="t:Context-39-" class="def">Context'</a> a = <a href="Control-Lens-Internal-Context.html#t:Context">Context</a> a a <a href="src/Control-Lens-Internal-Context.html#Context%27" class="link">Source</a></p><div class="doc"><pre>type <code><a href="Control-Lens-Internal-Context.html#t:Context-39-">Context'</a></code> a s = <code><a href="Control-Lens-Internal-Context.html#t:Context">Context</a></code> a a s</pre></div></div><div class="top"><p class="src"><span class="keyword">newtype</span> <a name="t:Pretext" class="def">Pretext</a> p a b t <a href="src/Control-Lens-Internal-Context.html#Pretext" class="link">Source</a></p><div class="doc"><p>This is a generalized form of <code><a href="Control-Lens-Internal-Context.html#t:Context">Context</a></code> that can be repeatedly cloned with less
impact on its performance, and which permits the use of an arbitrary <code><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a></code>
<code><a href="Control-Lens-Iso.html#t:Profunctor">Profunctor</a></code></p></div><div class="subs constructors"><p class="caption">Constructors</p><table><tr><td class="src"><a name="v:Pretext" class="def">Pretext</a></td><td class="doc empty"> </td></tr><tr><td colspan="2"><div class="subs fields"><p class="caption">Fields</p><dl><dt class="src"><a name="v:runPretext" class="def">runPretext</a> :: <span class="keyword">forall</span> f. <a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.8.2.0/Data-Functor.html#t:Functor">Functor</a> f => p a (f b) -> f t</dt><dd class="doc empty"> </dd></dl><div class="clear"></div></div></td></tr></table></div><div class="subs instances"><p id="control.i:Pretext" class="caption collapser" onclick="toggleSection('i:Pretext')">Instances</p><div id="section.i:Pretext" class="show"><table><tr><td class="src clearfix"><span class="inst-left"><a href="file:///usr/share/doc/libghc-profunctors-doc/html/Data-Profunctor-Rep.html#t:Corepresentable">Corepresentable</a> p => <a href="Control-Lens-Internal-Context.html#t:Sellable">Sellable</a> p (<a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-272" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left">((~) * a b, <a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p) => <a href="file:///usr/share/doc/libghc-comonad-doc/html/Control-Comonad-Store-Class.html#t:ComonadStore">ComonadStore</a> a (<a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a> p a b)</span> <a href="src/Control-Lens-Internal-Context.html#line-258" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p => <a href="Control-Lens-Internal-Context.html#t:IndexedComonadStore">IndexedComonadStore</a> (<a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-242" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p => <a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a> (<a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-230" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> (<a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a> p)</span> <a href="src/Control-Lens-Internal-Context.html#line-222" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.8.2.0/Data-Functor.html#t:Functor">Functor</a> (<a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a> p a b)</span> <a href="src/Control-Lens-Internal-Context.html#line-226" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left">((~) * a b, <a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p) => <a href="file:///usr/share/doc/libghc-comonad-doc/html/Control-Comonad.html#t:Comonad">Comonad</a> (<a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a> p a b)</span> <a href="src/Control-Lens-Internal-Context.html#line-236" class="link">Source</a></td><td class="doc empty"> </td></tr></table></div></div></div><div class="top"><p class="src"><span class="keyword">type</span> <a name="t:Pretext-39-" class="def">Pretext'</a> p a = <a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a> p a a <a href="src/Control-Lens-Internal-Context.html#Pretext%27" class="link">Source</a></p><div class="doc"><pre>type <code><a href="Control-Lens-Internal-Context.html#t:Pretext-39-">Pretext'</a></code> p a s = <code><a href="Control-Lens-Internal-Context.html#t:Pretext">Pretext</a></code> p a a s</pre></div></div><div class="top"><p class="src"><span class="keyword">newtype</span> <a name="t:PretextT" class="def">PretextT</a> p g a b t <a href="src/Control-Lens-Internal-Context.html#PretextT" class="link">Source</a></p><div class="doc"><p>This is a generalized form of <code><a href="Control-Lens-Internal-Context.html#t:Context">Context</a></code> that can be repeatedly cloned with less
impact on its performance, and which permits the use of an arbitrary <code><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a></code>
<code><a href="Control-Lens-Iso.html#t:Profunctor">Profunctor</a></code>.</p><p>The extra phantom <code><a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.8.2.0/Data-Functor.html#t:Functor">Functor</a></code> is used to let us lie and claim
<code><a href="Control-Lens-Getter.html#v:Getter">Getter</a></code>-compatibility under limited circumstances.
This is used internally to permit a number of combinators to gracefully
degrade when applied to a <code><a href="Control-Lens-Fold.html#v:Fold">Fold</a></code> or
<code><a href="Control-Lens-Getter.html#v:Getter">Getter</a></code>.</p></div><div class="subs constructors"><p class="caption">Constructors</p><table><tr><td class="src"><a name="v:PretextT" class="def">PretextT</a></td><td class="doc empty"> </td></tr><tr><td colspan="2"><div class="subs fields"><p class="caption">Fields</p><dl><dt class="src"><a name="v:runPretextT" class="def">runPretextT</a> :: <span class="keyword">forall</span> f. <a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.8.2.0/Data-Functor.html#t:Functor">Functor</a> f => p a (f b) -> f t</dt><dd class="doc empty"> </dd></dl><div class="clear"></div></div></td></tr></table></div><div class="subs instances"><p id="control.i:PretextT" class="caption collapser" onclick="toggleSection('i:PretextT')">Instances</p><div id="section.i:PretextT" class="show"><table><tr><td class="src clearfix"><span class="inst-left"><a href="file:///usr/share/doc/libghc-profunctors-doc/html/Data-Profunctor-Rep.html#t:Corepresentable">Corepresentable</a> p => <a href="Control-Lens-Internal-Context.html#t:Sellable">Sellable</a> p (<a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-352" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left">((~) * a b, <a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p) => <a href="file:///usr/share/doc/libghc-comonad-doc/html/Control-Comonad-Store-Class.html#t:ComonadStore">ComonadStore</a> a (<a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g a b)</span> <a href="src/Control-Lens-Internal-Context.html#line-338" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p => <a href="Control-Lens-Internal-Context.html#t:IndexedComonadStore">IndexedComonadStore</a> (<a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-322" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p => <a href="Control-Lens-Internal-Context.html#t:IndexedComonad">IndexedComonad</a> (<a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-310" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="Control-Lens-Internal-Context.html#t:IndexedFunctor">IndexedFunctor</a> (<a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g)</span> <a href="src/Control-Lens-Internal-Context.html#line-302" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left"><a href="file:///usr/share/doc/ghc-doc/html/libraries/base-4.8.2.0/Data-Functor.html#t:Functor">Functor</a> (<a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g a b)</span> <a href="src/Control-Lens-Internal-Context.html#line-306" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left">((~) * a b, <a href="Control-Lens-Internal-Indexed.html#t:Conjoined">Conjoined</a> p) => <a href="file:///usr/share/doc/libghc-comonad-doc/html/Control-Comonad.html#t:Comonad">Comonad</a> (<a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g a b)</span> <a href="src/Control-Lens-Internal-Context.html#line-316" class="link">Source</a></td><td class="doc empty"> </td></tr><tr><td class="src clearfix"><span class="inst-left">(<a href="Control-Lens-Iso.html#t:Profunctor">Profunctor</a> p, <a href="Control-Lens-Getter.html#t:Contravariant">Contravariant</a> g) => <a href="Control-Lens-Getter.html#t:Contravariant">Contravariant</a> (<a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g a b)</span> <a href="src/Control-Lens-Internal-Context.html#line-356" class="link">Source</a></td><td class="doc empty"> </td></tr></table></div></div></div><div class="top"><p class="src"><span class="keyword">type</span> <a name="t:PretextT-39-" class="def">PretextT'</a> p g a = <a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a> p g a a <a href="src/Control-Lens-Internal-Context.html#PretextT%27" class="link">Source</a></p><div class="doc"><pre>type <code><a href="Control-Lens-Internal-Context.html#t:PretextT-39-">PretextT'</a></code> p g a s = <code><a href="Control-Lens-Internal-Context.html#t:PretextT">PretextT</a></code> p g a a s</pre></div></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.16.1</p></div></body></html>
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