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iif.html

iif.html 2.1 KB
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  1. <html>
    2. 

  2. <head>
    3. 

  3. 	<title>BOOST_PP_IIF</title>
    4. 

  4. 	<link rel="stylesheet" type="text/css" href="../styles.css">
    5. 

  5. </head>
    6. 

  6. <body>
    7. 

  7. 	<div style="margin-left:  0px;">
    8. 

  8. 		The <b>BOOST_PP_IIF</b> macro chooses between to values based on a bitwise condition.
    9. 

  9. 	</div>
    10. 

  10. 	<h4>Usage</h4>
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  11. 		<div class="code">
    12. 

  12. 			<b>BOOST_PP_IIF</b>(<i>bit</i>, <i>t</i>, <i>f</i>)
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  13. 		</div>
    14. 

  14. 	<h4>Arguments</h4>
    15. 

  15. 		<dl>
    16. 

  16. 			<dt>bit</dt>
    17. 

  17. 			<dd>
    18. 

  18. 				The condition that determines if the result is <i>expr</i> or nothing.&nbsp;
    19. 

  19. 				This value must expand to <i>0</i> or <i>1</i>.
    20. 

  20. 			</dd>
    21. 

  21. 			<dt>t</dt>
    22. 

  22. 			<dd>
    23. 

  23. 				The result of the expansion if <i>bit</i> is <i>1</i>.
    24. 

  24. 			</dd>
    25. 

  25. 			<dt>f</dt>
    26. 

  26. 			<dd>
    27. 

  27. 				The result of the expansion if <i>bit</i> is <i>0</i>.
    28. 

  28. 			</dd>
    29. 

  29. 		</dl>
    30. 

  30. 	<h4>Remarks</h4>
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  31. 		<div>
    32. 

  32. 			This macro <i>does not</i> perform a boolean conversion on its first argument.&nbsp;
    33. 

  33. 			If that conversion is necessary, use <b>BOOST_PP_IF</b> instead.
    34. 

  34. 		</div>
    35. 

  35. 	<h4>See Also</h4>
    36. 

  36. 		<ul>
    37. 

  37. 			<li><a href="if.html">BOOST_PP_IF</a></li>
    38. 

  38. 			<li><a href="limit_mag.html">BOOST_PP_LIMIT_MAG</a></li>
    39. 

  39. 		</ul>
    40. 

  40. 	<h4>Requirements</h4>
    41. 

  41. 		<div>
    42. 

  42. 			<b>Header:</b> &nbsp;<a href="../headers/control/iif.html">&lt;boost/preprocessor/control/iif.hpp&gt;</a>
    43. 

  43. 		</div>
    44. 

  44. 	<h4>Sample Code</h4>
    45. 

  45. <div><pre>
    46. 

  46. #include &lt;<a href="../headers/control/iif.html">boost/preprocessor/control/iif.hpp</a>&gt;
    47. 

  47. #include &lt;<a href="../headers/logical/or.html">boost/preprocessor/logical/or.hpp</a>&gt;
    48. 

  48. 

  49. #define OR_IF(p, q, t, f) <a href="iif.html">BOOST_PP_IIF</a>(<a href="or.html">BOOST_PP_OR</a>(p, q), t, f)
    50. 

  50. 

  51. OR_IF(1, 0, abc, xyz) // expands to abc
    52. 

  52. OR_IF(0, 0, abc, xyz) // expands to xyz
    53. 

  53. </pre></div>
    54. 

  54. 	<hr size="1">
    55. 

  55. 	<div style="margin-left: 0px;">
    56. 

  56. 		<i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
    57. 

  57. 		</br><i>© Copyright Paul Mensonides 2002</i>
    58. 

  58. 	</div>
    59. 

  59. 	<div style="margin-left: 0px;">
    60. 

  60. 		<p><small>Distributed under the Boost Software License, Version 1.0. (See
    61. 

  61. 		accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
    62. 

  62. 		copy at <a href=
    63. 

  63. 		"http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
    64. 

  64. 	</div>
    65. 

  65. </body>
    66. 

  66. </html>
    67.