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BOOST_SCOPE_EXIT_TPL.html

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  26. <a name="BOOST_SCOPE_EXIT_TPL"></a><div class="titlepage"></div>
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    28. 

  28. <h2><span class="refentrytitle">Macro BOOST_SCOPE_EXIT_TPL</span></h2>
    29. 

  29. <p>BOOST_SCOPE_EXIT_TPL &#8212; This macro is a workaround for various versions of GCC to declare scope exits within templates. </p>
    30. 

  30. </div>
    31. 

  31. <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
    32. 

  32. <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="reference.html#header.boost.scope_exit_hpp" title="Header &lt;boost/scope_exit.hpp&gt;">boost/scope_exit.hpp</a>&gt;
    33. 

  33. 

  34. </span>BOOST_SCOPE_EXIT_TPL(capture_list)</pre></div>
    35. 

  35. <div class="refsect1">
    36. 

  36. <a name="id876470"></a><h2>Description</h2>
    37. 

  37. <p>Various versions of the GCC compiler do not compile <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT.html" title="Macro BOOST_SCOPE_EXIT">BOOST_SCOPE_EXIT</a></code> inside function templates. As a workaround, <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT_TPL.html" title="Macro BOOST_SCOPE_EXIT_TPL">BOOST_SCOPE_EXIT_TPL</a></code> should be used instead of  <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT.html" title="Macro BOOST_SCOPE_EXIT">BOOST_SCOPE_EXIT</a></code> in these cases:</p>
    38. 

  38. <pre class="programlisting"><span class="special">{</span> <span class="comment">// Some local scope.</span>
    39. 

  39.     <span class="special">...</span>
    40. 

  40.     <span class="identifier">BOOST_SCOPE_EXIT_TPL</span><span class="special">(</span><span class="identifier">capture_list</span><span class="special">)</span> <span class="special">{</span>
    41. 

  41.         <span class="special">...</span> <span class="comment">// Body code.</span>
    42. 

  42.     <span class="special">}</span> <span class="identifier">BOOST_SCOPE_EXIT_END</span>
    43. 

  43.     <span class="special">...</span>
    44. 

  44. <span class="special">}</span>
    45. 

  45. </pre>
    46. 

  46. <p>The syntax of <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT_TPL.html" title="Macro BOOST_SCOPE_EXIT_TPL">BOOST_SCOPE_EXIT_TPL</a></code> is the exact same as the one of  <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT.html" title="Macro BOOST_SCOPE_EXIT">BOOST_SCOPE_EXIT</a></code> (see <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT.html" title="Macro BOOST_SCOPE_EXIT">BOOST_SCOPE_EXIT</a></code> for more information).</p>
    47. 

  47. <p>On C++11 compilers, <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT_TPL.html" title="Macro BOOST_SCOPE_EXIT_TPL">BOOST_SCOPE_EXIT_TPL</a></code> is not needed because  <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT.html" title="Macro BOOST_SCOPE_EXIT">BOOST_SCOPE_EXIT</a></code> always compiles on GCC versions that support C++11. However, <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT_TPL.html" title="Macro BOOST_SCOPE_EXIT_TPL">BOOST_SCOPE_EXIT_TPL</a></code> is still provided on C++11 so to write code that is portable between C++03 and C++11 compilers. It is recommended to always use <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT_TPL.html" title="Macro BOOST_SCOPE_EXIT_TPL">BOOST_SCOPE_EXIT_TPL</a></code> within templates so to maximize portability.</p>
    48. 

  48. <p>In general, the special macro <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT_ID_TPL.html" title="Macro BOOST_SCOPE_EXIT_ID_TPL">BOOST_SCOPE_EXIT_ID_TPL</a></code> must be used instead of <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT_TPL.html" title="Macro BOOST_SCOPE_EXIT_TPL">BOOST_SCOPE_EXIT_TPL</a></code> when it is necessary to expand multiple scope exit declarations on the same line within templates.</p>
    49. 

  49. <p><span class="bold"><strong>Note:</strong></span> The issue in compiling scope exit declarations that some GCC versions have is illustrated by the following code (see also <a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37920" target="_top">GCC bug 37920</a>): </p>
    50. 

  50. <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
    51. 

  51. <span class="keyword">void</span> <span class="identifier">f</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">x</span><span class="special">)</span> <span class="special">{</span>
    52. 

  52.     <span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
    53. 

  53.     <span class="keyword">struct</span> <span class="identifier">local</span> <span class="special">{</span>
    54. 

  54.         <span class="keyword">typedef</span> <span class="identifier">__typeof__</span><span class="special">(</span><span class="identifier">i</span><span class="special">)</span> <span class="identifier">typeof_i</span><span class="special">;</span>
    55. 

  55.         <span class="keyword">typedef</span> <span class="identifier">__typeof__</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span> <span class="identifier">typeof_x</span><span class="special">;</span>
    56. 

  56.     <span class="special">}</span><span class="special">;</span>
    57. 

  57.     <span class="keyword">typedef</span> <span class="identifier">local</span><span class="special">::</span><span class="identifier">typeof_i</span> <span class="identifier">i_type</span><span class="special">;</span>
    58. 

  58.     <span class="keyword">typedef</span> <span class="identifier">local</span><span class="special">::</span><span class="identifier">typeof_x</span> <span class="identifier">x_type</span><span class="special">;</span>
    59. 

  59. <span class="special">}</span>
    60. 

  60. 

  61. <span class="keyword">int</span> <span class="identifier">main</span><span class="special">(</span><span class="keyword">void</span><span class="special">)</span> <span class="special">{</span> <span class="identifier">f</span><span class="special">(</span><span class="number">0</span><span class="special">)</span><span class="special">;</span> <span class="special">}</span>
    62. 

  62. </pre>
    63. 

  63. <p> This can be fixed by adding <code class="computeroutput">typename</code> in front of <code class="computeroutput">local::typeof_i</code> and <code class="computeroutput">local::typeof_x</code> (which is the approach followed by the implementation of the <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT_TPL.html" title="Macro BOOST_SCOPE_EXIT_TPL">BOOST_SCOPE_EXIT_TPL</a></code> macro).</p>
    64. 

  64. <p><span class="bold"><strong>Note:</strong></span> Although <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT_TPL.html" title="Macro BOOST_SCOPE_EXIT_TPL">BOOST_SCOPE_EXIT_TPL</a></code> has the same suffix as <code class="computeroutput">BOOST_TYPEOF_TPL</code>, it does not follow the Boost.Typeof convention.</p>
    65. 

  65. <p><span class="bold"><strong>See:</strong></span> <a class="link" href="scope_exit/tutorial.html" title="Tutorial"> Tutorial</a> section, <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT.html" title="Macro BOOST_SCOPE_EXIT">BOOST_SCOPE_EXIT</a></code>,  <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT_END.html" title="Macro BOOST_SCOPE_EXIT_END">BOOST_SCOPE_EXIT_END</a></code>, <code class="computeroutput"><a class="link" href="BOOST_SCOPE_EXIT_ID_TPL.html" title="Macro BOOST_SCOPE_EXIT_ID_TPL">BOOST_SCOPE_EXIT_ID_TPL</a></code>. </p>
    66. 

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  70. <td align="right"><div class="copyright-footer">Copyright &#169; 2006-2012 Alexander Nasonov, Lorenzo Caminiti<p>
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  71.         Distributed under the Boost Software License, Version 1.0 (see accompanying
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  72.         file LICENSE_1_0.txt or a copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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