/Src/Dependencies/Boost/libs/preprocessor/doc/ref/list_first.html

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  1. <html>
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  2. <head>
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  3. 	<title>BOOST_PP_LIST_FIRST</title>
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  4. 	<link rel="stylesheet" type="text/css" href="../styles.css">
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  5. </head>
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  6. <body>
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  7. 	<div style="margin-left:  0px;">
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  8. 		The <b>BOOST_PP_LIST_FIRST</b> macro expands to the head of a <i>list</i>.
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  9. 	</div>
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  10. 	<h4>Usage</h4>
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  11. 		<div class="code">
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  12. 			<b>BOOST_PP_LIST_FIRST</b>(<i>list</i>)
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  13. 		</div>
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  14. 	<h4>Arguments</h4>
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  15. 		<dl>
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  16. 			<dt>list</dt>
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  17. 			<dd>
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  18. 				A non-nil <i>list</i>.
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  19. 			</dd>
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  20. 		</dl>
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  21. 	<h4>Requirements</h4>
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  22. 		<div>
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  23. 			<b>Header:</b> &nbsp;<a href="../headers/list/adt.html">&lt;boost/preprocessor/list/adt.hpp&gt;</a>
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  24. 		</div>
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  25. 	<h4>Sample Code</h4>
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  26. <div><pre>
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  27. #include &lt;<a href="../headers/list/adt.html">boost/preprocessor/list/adt.hpp</a>&gt;
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  28. 

  29. #define OLD \
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  30.    <a href="list_cons.html">BOOST_PP_LIST_CONS</a>( \
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  31.       a, \
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  32.       <a href="list_cons.html">BOOST_PP_LIST_CONS</a>( \
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  33.          b, \
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  34.          <a href="list_cons.html">BOOST_PP_LIST_CONS</a>( \
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  35.             c, \
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  36.             <a href="list_nil.html">BOOST_PP_LIST_NIL</a> \
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  37.          ) \
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  38.       ) \
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  39.    ) \
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  40.    /**/
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  41. 

  42. #define NEW (a, (b, (c, <a href="nil.html">BOOST_PP_NIL</a>)))
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  43. 

  44. <a href="list_first.html">BOOST_PP_LIST_FIRST</a>(OLD) == <a href="list_first.html">BOOST_PP_LIST_FIRST</a>(NEW)
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  45.    // expands to a == a
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  46. 

  47. <a href="list_rest.html">BOOST_PP_LIST_REST</a>(OLD) == <a href="list_rest.html">BOOST_PP_LIST_REST</a>(NEW)
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  48.    // expands to (b, (c, <a href="nil.html">BOOST_PP_NIL</a>)) == (b, (c, <a href="nil.html">BOOST_PP_NIL</a>))
    49. 

  49. </pre></div>
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  50. 	<hr size="1">
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  51. 	<div style="margin-left: 0px;">
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  52. 		<i>Š Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
    53. 

  53. 		</br><i>Š Copyright Paul Mensonides 2002</i>
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  54. 	</div>
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  55. 	<div style="margin-left: 0px;">
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  56. 		<p><small>Distributed under the Boost Software License, Version 1.0. (See
    57. 

  57. 		accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
    58. 

  58. 		copy at <a href=
    59. 

  59. 		"http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
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  60. 	</div>
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  61. </body>
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  62. </html>
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