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  25. <div class="section">
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  26. <div class="titlepage"><div><div><h2 class="title" style="clear: both">
    27. 

  27. <a name="boost_integer.minmax"></a><a class="link" href="minmax.html" title="Compile time min/max calculation">Compile time min/max calculation</a>
    28. 

  28. </h2></div></div></div>
    29. 

  29. <div class="toc"><dl class="toc">
    30. 

  30. <dt><span class="section"><a href="minmax.html#boost_integer.minmax.synopsis">Synopsis</a></span></dt>
    31. 

  31. <dt><span class="section"><a href="minmax.html#boost_integer.minmax.usage">Usage</a></span></dt>
    32. 

  32. <dt><span class="section"><a href="minmax.html#boost_integer.minmax.example">Example</a></span></dt>
    33. 

  33. <dt><span class="section"><a href="minmax.html#boost_integer.minmax.demonstration_program">Demonstration
    34. 

  34.       Program</a></span></dt>
    35. 

  35. <dt><span class="section"><a href="minmax.html#boost_integer.minmax.rationale">Rationale</a></span></dt>
    36. 

  36. <dt><span class="section"><a href="minmax.html#boost_integer.minmax.credits">Credits</a></span></dt>
    37. 

  37. </dl></div>
    38. 

  38. <p>
    39. 

  39.       The class templates in <a href="../../../../../boost/integer/static_min_max.hpp" target="_top">&lt;boost/integer/static_min_max.hpp&gt;</a>
    40. 

  40.       provide a compile-time evaluation of the minimum or maximum of two integers.
    41. 

  41.       These facilities are useful for generic programming problems.
    42. 

  42.     </p>
    43. 

  43. <div class="section">
    44. 

  44. <div class="titlepage"><div><div><h3 class="title">
    45. 

  45. <a name="boost_integer.minmax.synopsis"></a><a class="link" href="minmax.html#boost_integer.minmax.synopsis" title="Synopsis">Synopsis</a>
    46. 

  46. </h3></div></div></div>
    47. 

  47. <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span>
    48. 

  48. <span class="special">{</span>
    49. 

  49. 

  50. <span class="keyword">typedef</span> <span class="emphasis"><em>implementation-defined</em></span> <span class="identifier">static_min_max_signed_type</span><span class="special">;</span>
    51. 

  51. <span class="keyword">typedef</span> <span class="emphasis"><em>implementation-defined</em></span> <span class="identifier">static_min_max_unsigned_type</span><span class="special">;</span>
    52. 

  52. 

  53. <span class="keyword">template</span> <span class="special">&lt;</span><span class="identifier">static_min_max_signed_type</span> <span class="identifier">Value1</span><span class="special">,</span> <span class="identifier">static_min_max_signed_type</span> <span class="identifier">Value2</span> <span class="special">&gt;</span>
    54. 

  54.     <span class="keyword">struct</span> <span class="identifier">static_signed_min</span><span class="special">;</span>
    55. 

  55. 

  56. <span class="keyword">template</span> <span class="special">&lt;</span><span class="identifier">static_min_max_signed_type</span> <span class="identifier">Value1</span><span class="special">,</span> <span class="identifier">static_min_max_signed_type</span> <span class="identifier">Value2</span><span class="special">&gt;</span>
    57. 

  57.     <span class="keyword">struct</span> <span class="identifier">static_signed_max</span><span class="special">;</span>
    58. 

  58. 

  59. <span class="keyword">template</span> <span class="special">&lt;</span><span class="identifier">static_min_max_unsigned_type</span> <span class="identifier">Value1</span><span class="special">,</span> <span class="identifier">static_min_max_unsigned_type</span> <span class="identifier">Value2</span><span class="special">&gt;</span>
    60. 

  60.     <span class="keyword">struct</span> <span class="identifier">static_unsigned_min</span><span class="special">;</span>
    61. 

  61. 

  62. <span class="keyword">template</span> <span class="special">&lt;</span><span class="identifier">static_min_max_unsigned_type</span> <span class="identifier">Value1</span><span class="special">,</span> <span class="identifier">static_min_max_unsigned_type</span> <span class="identifier">Value2</span><span class="special">&gt;</span>
    63. 

  63.     <span class="keyword">struct</span> <span class="identifier">static_unsigned_max</span><span class="special">;</span>
    64. 

  64. 

  65. <span class="special">}</span>
    66. 

  66. </pre>
    67. 

  67. </div>
    68. 

  68. <div class="section">
    69. 

  69. <div class="titlepage"><div><div><h3 class="title">
    70. 

  70. <a name="boost_integer.minmax.usage"></a><a class="link" href="minmax.html#boost_integer.minmax.usage" title="Usage">Usage</a>
    71. 

  71. </h3></div></div></div>
    72. 

  72. <p>
    73. 

  73.         The four class templates provide the combinations for finding the minimum
    74. 

  74.         or maximum of two <code class="literal">signed</code> or <code class="literal">unsigned</code>
    75. 

  75.         (<code class="literal">long</code>) parameters, <span class="emphasis"><em>Value1</em></span> and <span class="emphasis"><em>Value2</em></span>,
    76. 

  76.         at compile-time. Each template has a single static data member, <code class="literal">value</code>,
    77. 

  77.         which is set to the respective minimum or maximum of the template's parameters.
    78. 

  78.       </p>
    79. 

  79. </div>
    80. 

  80. <div class="section">
    81. 

  81. <div class="titlepage"><div><div><h3 class="title">
    82. 

  82. <a name="boost_integer.minmax.example"></a><a class="link" href="minmax.html#boost_integer.minmax.example" title="Example">Example</a>
    83. 

  83. </h3></div></div></div>
    84. 

  84. <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">integer</span><span class="special">/</span><span class="identifier">static_min_max</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
    85. 

  85. 

  86. <span class="keyword">template</span> <span class="special">&lt;</span> <span class="keyword">unsigned</span> <span class="keyword">long</span> <span class="identifier">AddendSize1</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">long</span> <span class="identifier">AddendSize2</span> <span class="special">&gt;</span>
    87. 

  87. <span class="keyword">class</span> <span class="identifier">adder</span>
    88. 

  88. <span class="special">{</span>
    89. 

  89. <span class="keyword">public</span><span class="special">:</span>
    90. 

  90.     <span class="keyword">static</span>  <span class="keyword">unsigned</span> <span class="keyword">long</span>  <span class="keyword">const</span>  <span class="identifier">addend1_size</span> <span class="special">=</span> <span class="identifier">AddendSize1</span><span class="special">;</span>
    91. 

  91.     <span class="keyword">static</span>  <span class="keyword">unsigned</span> <span class="keyword">long</span>  <span class="keyword">const</span>  <span class="identifier">addend2_size</span> <span class="special">=</span> <span class="identifier">AddendSize2</span><span class="special">;</span>
    92. 

  92.     <span class="keyword">static</span>  <span class="keyword">unsigned</span> <span class="keyword">long</span>  <span class="keyword">const</span>  <span class="identifier">sum_size</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">static_unsigned_max</span><span class="special">&lt;</span><span class="identifier">AddendSize1</span><span class="special">,</span> <span class="identifier">AddendSize2</span><span class="special">&gt;::</span><span class="identifier">value</span> <span class="special">+</span> <span class="number">1</span><span class="special">;</span>
    93. 

  93. 

  94.     <span class="keyword">typedef</span> <span class="keyword">int</span>  <span class="identifier">addend1_type</span><span class="special">[</span> <span class="identifier">addend1_size</span> <span class="special">];</span>
    95. 

  95.     <span class="keyword">typedef</span> <span class="keyword">int</span>  <span class="identifier">addend2_type</span><span class="special">[</span> <span class="identifier">addend2_size</span> <span class="special">];</span>
    96. 

  96.     <span class="keyword">typedef</span> <span class="keyword">int</span>  <span class="identifier">sum_type</span><span class="special">[</span> <span class="identifier">sum_size</span> <span class="special">];</span>
    97. 

  97. 

  98.     <span class="keyword">void</span>  <span class="keyword">operator</span> <span class="special">()(</span> <span class="identifier">addend1_type</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="identifier">a1</span><span class="special">,</span> <span class="identifier">addend2_type</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="identifier">a2</span><span class="special">,</span> <span class="identifier">sum_type</span> <span class="special">&amp;</span><span class="identifier">s</span> <span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
    99. 

  99. <span class="special">};</span>
    100. 

  100. 

  101. <span class="comment">//...</span>
    102. 

  102. 

  103. <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
    104. 

  104. <span class="special">{</span>
    105. 

  105.     <span class="keyword">int</span> <span class="keyword">const</span>   <span class="identifier">a1</span><span class="special">[]</span> <span class="special">=</span> <span class="special">{</span> <span class="number">0</span><span class="special">,</span> <span class="number">4</span><span class="special">,</span> <span class="number">3</span> <span class="special">};</span>  <span class="comment">// 340</span>
    106. 

  106.     <span class="keyword">int</span> <span class="keyword">const</span>   <span class="identifier">a2</span><span class="special">[]</span> <span class="special">=</span> <span class="special">{</span> <span class="number">9</span><span class="special">,</span> <span class="number">8</span> <span class="special">};</span>     <span class="comment">//  89</span>
    107. 

  107.     <span class="keyword">int</span>         <span class="identifier">s</span><span class="special">[</span> <span class="number">4</span> <span class="special">];</span>
    108. 

  108.     <span class="identifier">adder</span><span class="special">&lt;</span><span class="number">3</span><span class="special">,</span><span class="number">2</span><span class="special">&gt;</span>  <span class="identifier">obj</span><span class="special">;</span>
    109. 

  109. 

  110.     <span class="identifier">obj</span><span class="special">(</span> <span class="identifier">a1</span><span class="special">,</span> <span class="identifier">a2</span><span class="special">,</span> <span class="identifier">s</span> <span class="special">);</span>  <span class="comment">// 's' should be 429 or { 9, 2, 4, 0 }</span>
    111. 

  111.     <span class="comment">//...</span>
    112. 

  112. <span class="special">}</span>
    113. 

  113. </pre>
    114. 

  114. </div>
    115. 

  115. <div class="section">
    116. 

  116. <div class="titlepage"><div><div><h3 class="title">
    117. 

  117. <a name="boost_integer.minmax.demonstration_program"></a><a class="link" href="minmax.html#boost_integer.minmax.demonstration_program" title="Demonstration Program">Demonstration
    118. 

  118.       Program</a>
    119. 

  119. </h3></div></div></div>
    120. 

  120. <p>
    121. 

  121.         The program <a href="../../../test/static_min_max_test.cpp" target="_top">static_min_max_test.cpp</a>
    122. 

  122.         is a simplistic demonstration of various comparisons using the compile-time
    123. 

  123.         extrema class templates.
    124. 

  124.       </p>
    125. 

  125. </div>
    126. 

  126. <div class="section">
    127. 

  127. <div class="titlepage"><div><div><h3 class="title">
    128. 

  128. <a name="boost_integer.minmax.rationale"></a><a class="link" href="minmax.html#boost_integer.minmax.rationale" title="Rationale">Rationale</a>
    129. 

  129. </h3></div></div></div>
    130. 

  130. <p>
    131. 

  131.         Sometimes the minimum or maximum of several values needs to be found for
    132. 

  132.         later compile-time processing, <span class="emphasis"><em>e.g.</em></span> for a bound for
    133. 

  133.         another class template.
    134. 

  134.       </p>
    135. 

  135. </div>
    136. 

  136. <div class="section">
    137. 

  137. <div class="titlepage"><div><div><h3 class="title">
    138. 

  138. <a name="boost_integer.minmax.credits"></a><a class="link" href="minmax.html#boost_integer.minmax.credits" title="Credits">Credits</a>
    139. 

  139. </h3></div></div></div>
    140. 

  140. <p>
    141. 

  141.         The author of the Boost compile-time extrema class templates is <a href="http://www.boost.org/people/daryle_walker.html" target="_top">Daryle
    142. 

  142.         Walker</a>.
    143. 

  143.       </p>
    144. 

  144. </div>
    145. 

  145. </div>
    146. 

  146. <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
    147. 

  147. <td align="left"></td>
    148. 

  148. <td align="right"><div class="copyright-footer">Copyright &#169; 2001-2009 Beman
    149. 

  149.       Dawes, Daryle Walker, Gennaro Prota, John Maddock<p>
    150. 

  150.         Distributed under the Boost Software License, Version 1.0. (See accompanying
    151. 

  151.         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
    152. 

  152.       </p>
    153. 

  153. </div></td>
    154. 

  154. </tr></table>
    155. 

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    156. 

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