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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="src/Graphics-Rendering-OpenGL-GL-Exception.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">OpenGL-2.8.0.0: A binding for the OpenGL graphics system</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Portability</th><td>portable</td></tr><tr><th>Stability</th><td>stable</td></tr><tr><th>Maintainer</th><td>sven.panne@aedion.de</td></tr><tr><th>Safe Haskell</th><td>Safe-Inferred</td></tr></table><p class="caption">Graphics.Rendering.OpenGL.GL.Exception</p></div><div id="description"><p class="caption">Description</p><div class="doc"><p>This is a purely internal module to compensate for differences between
Haskell implementations.
</p></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"><a href="#v:bracket">bracket</a> :: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> a -> (a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> b) -> (a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> c) -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> c</li><li class="src short"><a href="#v:bracket_">bracket_</a> :: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> b -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> c -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> c</li><li class="src short"><a href="#v:unsafeBracket_">unsafeBracket_</a> :: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> b -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> c -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> c</li><li class="src short"><a href="#v:finallyRet">finallyRet</a> :: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> b -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> (a, b)</li></ul></div><div id="interface"><h1>Documentation</h1><div class="top"><p class="src"><a name="v:bracket" class="def">bracket</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> a</td><td class="doc"><p>computation to run first ("acquire resource")
</p></td></tr><tr><td class="src">-> (a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> b)</td><td class="doc"><p>computation to run last ("release resource")
</p></td></tr><tr><td class="src">-> (a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> c)</td><td class="doc"><p>computation to run in-between
</p></td></tr><tr><td class="src">-> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> c</td><td class="doc empty"> </td></tr></table></div><div class="doc"><p>When you want to acquire a resource, do some work with it, and
then release the resource, it is a good idea to use <code><a href="Graphics-Rendering-OpenGL-GL-Exception.html#v:bracket">bracket</a></code>,
because <code><a href="Graphics-Rendering-OpenGL-GL-Exception.html#v:bracket">bracket</a></code> will install the necessary exception handler to
release the resource in the event that an exception is raised
during the computation. If an exception is raised, then <code><a href="Graphics-Rendering-OpenGL-GL-Exception.html#v:bracket">bracket</a></code> will
re-raise the exception (after performing the release).
</p><p>A common example is opening a file:
</p><pre> bracket
(openFile "filename" ReadMode)
(hClose)
(\fileHandle -> do { ... })
</pre><p>The arguments to <code><a href="Graphics-Rendering-OpenGL-GL-Exception.html#v:bracket">bracket</a></code> are in this order so that we can partially apply
it, e.g.:
</p><pre> withFile name mode = bracket (openFile name mode) hClose
</pre></div></div><div class="top"><p class="src"><a name="v:bracket_" class="def">bracket_</a> :: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> b -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> c -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> c</p><div class="doc"><p>A variant of <code><a href="Graphics-Rendering-OpenGL-GL-Exception.html#v:bracket">bracket</a></code> where the return value from the first computation
is not required.
</p></div></div><div class="top"><p class="src"><a name="v:unsafeBracket_" class="def">unsafeBracket_</a> :: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> b -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> c -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> c<a href="src/Graphics-Rendering-OpenGL-GL-Exception.html#unsafeBracket_" class="link">Source</a></p></div><div class="top"><p class="src"><a name="v:finallyRet" class="def">finallyRet</a> :: <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> a -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> b -> <a href="/usr/share/doc/ghc-doc/html/libraries/base-4.6.0.1/System-IO.html#t:IO">IO</a> (a, b)<a href="src/Graphics-Rendering-OpenGL-GL-Exception.html#finallyRet" class="link">Source</a></p></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.13.2</p></div></body></html>
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