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conversion_traits___traits_class.html

conversion_traits___traits_class.html 39 KB
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  4. <title>conversion_traits&lt;&gt; traits class</title>
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    26. 

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

  27. <a name="boost_numericconversion.conversion_traits___traits_class"></a><a class="link" href="conversion_traits___traits_class.html" title="conversion_traits&lt;&gt; traits class">conversion_traits&lt;&gt;
    28. 

  28.     traits class</a>
    29. 

  29. </h2></div></div></div>
    30. 

  30. <div class="toc"><dl class="toc">
    31. 

  31. <dt><span class="section"><a href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types">Types</a></span></dt>
    32. 

  32. <dt><span class="section"><a href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.examples">Examples</a></span></dt>
    33. 

  33. </dl></div>
    34. 

  34. <div class="section">
    35. 

  35. <div class="titlepage"><div><div><h3 class="title">
    36. 

  36. <a name="boost_numericconversion.conversion_traits___traits_class.types"></a><a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types" title="Types">Types</a>
    37. 

  37. </h3></div></div></div>
    38. 

  38. <div class="toc"><dl class="toc">
    39. 

  39. <dt><span class="section"><a href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.enumeration_int_float_mixture_enum">enumeration
    40. 

  40.         int_float_mixture_enum</a></span></dt>
    41. 

  41. <dt><span class="section"><a href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.enumeration_sign_mixture_enum">enumeration
    42. 

  42.         sign_mixture_enum</a></span></dt>
    43. 

  43. <dt><span class="section"><a href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.enumeration_udt_builtin_mixture_enum">enumeration
    44. 

  44.         udt_builtin_mixture_enum</a></span></dt>
    45. 

  45. <dt><span class="section"><a href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_int_float_mixture__">template
    46. 

  46.         class int_float_mixture&lt;&gt;</a></span></dt>
    47. 

  47. <dt><span class="section"><a href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_sign_mixture__">template
    48. 

  48.         class sign_mixture&lt;&gt;</a></span></dt>
    49. 

  49. <dt><span class="section"><a href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_udt_builtin_mixture__">template
    50. 

  50.         class udt_builtin_mixture&lt;&gt;</a></span></dt>
    51. 

  51. <dt><span class="section"><a href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_is_subranged__">template
    52. 

  52.         class is_subranged&lt;&gt;</a></span></dt>
    53. 

  53. <dt><span class="section"><a href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_conversion_traits__">template
    54. 

  54.         class conversion_traits&lt;&gt;</a></span></dt>
    55. 

  55. </dl></div>
    56. 

  56. <div class="section">
    57. 

  57. <div class="titlepage"><div><div><h4 class="title">
    58. 

  58. <a name="boost_numericconversion.conversion_traits___traits_class.types.enumeration_int_float_mixture_enum"></a><a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.enumeration_int_float_mixture_enum" title="enumeration int_float_mixture_enum">enumeration
    59. 

  59.         int_float_mixture_enum</a>
    60. 

  60. </h4></div></div></div>
    61. 

  61. <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">numeric</span> <span class="special">{</span>
    62. 

  62. 

  63.     <span class="keyword">enum</span> <span class="identifier">int_float_mixture_enum</span>
    64. 

  64.     <span class="special">{</span>
    65. 

  65.        <span class="identifier">integral_to_integral</span>
    66. 

  66.       <span class="special">,</span><span class="identifier">integral_to_float</span>
    67. 

  67.       <span class="special">,</span><span class="identifier">float_to_integral</span>
    68. 

  68.       <span class="special">,</span><span class="identifier">float_to_float</span>
    69. 

  69.     <span class="special">}</span> <span class="special">;</span>
    70. 

  70. 

  71. <span class="special">}</span> <span class="special">}</span> <span class="comment">// namespace boost::numeric</span>
    72. 

  72. </pre>
    73. 

  73. </div>
    74. 

  74. <div class="section">
    75. 

  75. <div class="titlepage"><div><div><h4 class="title">
    76. 

  76. <a name="boost_numericconversion.conversion_traits___traits_class.types.enumeration_sign_mixture_enum"></a><a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.enumeration_sign_mixture_enum" title="enumeration sign_mixture_enum">enumeration
    77. 

  77.         sign_mixture_enum</a>
    78. 

  78. </h4></div></div></div>
    79. 

  79. <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">numeric</span> <span class="special">{</span>
    80. 

  80. 

  81. <span class="keyword">enum</span> <span class="identifier">sign_mixture_enum</span>
    82. 

  82. <span class="special">{</span>
    83. 

  83.    <span class="identifier">unsigned_to_unsigned</span>
    84. 

  84.   <span class="special">,</span><span class="identifier">signed_to_signed</span>
    85. 

  85.   <span class="special">,</span><span class="identifier">signed_to_unsigned</span>
    86. 

  86.   <span class="special">,</span><span class="identifier">unsigned_to_signed</span>
    87. 

  87. <span class="special">}</span> <span class="special">;</span>
    88. 

  88. 

  89. <span class="special">}</span> <span class="special">}</span> <span class="comment">// namespace boost::numeric</span>
    90. 

  90. </pre>
    91. 

  91. </div>
    92. 

  92. <div class="section">
    93. 

  93. <div class="titlepage"><div><div><h4 class="title">
    94. 

  94. <a name="boost_numericconversion.conversion_traits___traits_class.types.enumeration_udt_builtin_mixture_enum"></a><a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.enumeration_udt_builtin_mixture_enum" title="enumeration udt_builtin_mixture_enum">enumeration
    95. 

  95.         udt_builtin_mixture_enum</a>
    96. 

  96. </h4></div></div></div>
    97. 

  97. <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">numeric</span> <span class="special">{</span>
    98. 

  98. 

  99.     <span class="keyword">enum</span> <span class="identifier">udt_builtin_mixture_enum</span>
    100. 

  100.     <span class="special">{</span>
    101. 

  101.        <span class="identifier">builtin_to_builtin</span>
    102. 

  102.       <span class="special">,</span><span class="identifier">builtin_to_udt</span>
    103. 

  103.       <span class="special">,</span><span class="identifier">udt_to_builtin</span>
    104. 

  104.       <span class="special">,</span><span class="identifier">udt_to_udt</span>
    105. 

  105.     <span class="special">}</span> <span class="special">;</span>
    106. 

  106. 

  107. <span class="special">}</span> <span class="special">}</span> <span class="comment">// namespace boost::numeric</span>
    108. 

  108. </pre>
    109. 

  109. </div>
    110. 

  110. <div class="section">
    111. 

  111. <div class="titlepage"><div><div><h4 class="title">
    112. 

  112. <a name="boost_numericconversion.conversion_traits___traits_class.types.template_class_int_float_mixture__"></a><a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_int_float_mixture__" title="template class int_float_mixture&lt;&gt;">template
    113. 

  113.         class int_float_mixture&lt;&gt;</a>
    114. 

  114. </h4></div></div></div>
    115. 

  115. <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">numeric</span> <span class="special">{</span>
    116. 

  116. 

  117.     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">S</span><span class="special">&gt;</span>
    118. 

  118.     <span class="keyword">struct</span> <span class="identifier">int_float_mixture</span> <span class="special">:</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">integral_c</span><span class="special">&lt;</span><span class="identifier">int_float_mixture_enum</span><span class="special">,</span> <span class="identifier">impl</span><span class="special">-</span><span class="identifier">def</span><span class="special">-</span><span class="identifier">value</span><span class="special">&gt;</span> <span class="special">{}</span> <span class="special">;</span>
    119. 

  119. 

  120. <span class="special">}</span> <span class="special">}</span> <span class="comment">// namespace boost::numeric</span>
    121. 

  121. </pre>
    122. 

  122. <p>
    123. 

  123.           Classifying <code class="computeroutput"><span class="identifier">S</span></code> and <code class="computeroutput"><span class="identifier">T</span></code> as either integral or float, this
    124. 

  124.           <a href="../../../../../mpl/doc/refmanual/integral-constant.html" target="_top">MPL's
    125. 

  125.           Integral Constant</a> indicates the combination of these attributes.
    126. 

  126.         </p>
    127. 

  127. <p>
    128. 

  128.           Its <code class="computeroutput"><span class="special">::</span><span class="identifier">value</span></code>
    129. 

  129.           is of enumeration type <a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.enumeration_int_float_mixture_enum" title="enumeration int_float_mixture_enum"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">numeric</span><span class="special">::</span><span class="identifier">int_float_mixture_enum</span></code></a>
    130. 

  130.         </p>
    131. 

  131. </div>
    132. 

  132. <div class="section">
    133. 

  133. <div class="titlepage"><div><div><h4 class="title">
    134. 

  134. <a name="boost_numericconversion.conversion_traits___traits_class.types.template_class_sign_mixture__"></a><a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_sign_mixture__" title="template class sign_mixture&lt;&gt;">template
    135. 

  135.         class sign_mixture&lt;&gt;</a>
    136. 

  136. </h4></div></div></div>
    137. 

  137. <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">numeric</span> <span class="special">{</span>
    138. 

  138. 

  139.     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">S</span><span class="special">&gt;</span>
    140. 

  140.     <span class="keyword">struct</span> <span class="identifier">sign_mixture</span> <span class="special">:</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">integral_c</span><span class="special">&lt;</span><span class="identifier">sign_mixture_enum</span><span class="special">,</span> <span class="identifier">impl</span><span class="special">-</span><span class="identifier">def</span><span class="special">-</span><span class="identifier">value</span><span class="special">&gt;</span> <span class="special">{}</span> <span class="special">;</span>
    141. 

  141. 

  142. <span class="special">}</span> <span class="special">}</span> <span class="comment">// namespace boost::numeric</span>
    143. 

  143. </pre>
    144. 

  144. <p>
    145. 

  145.           Classifying <code class="computeroutput"><span class="identifier">S</span></code> and <code class="computeroutput"><span class="identifier">T</span></code> as either signed or unsigned, this
    146. 

  146.           <a href="../../../../../mpl/doc/refmanual/integral-constant.html" target="_top">MPL's
    147. 

  147.           Integral Constant</a> indicates the combination of these attributes.
    148. 

  148.         </p>
    149. 

  149. <p>
    150. 

  150.           Its <code class="computeroutput"><span class="special">::</span><span class="identifier">value</span></code>
    151. 

  151.           is of enumeration type <a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.enumeration_sign_mixture_enum" title="enumeration sign_mixture_enum"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">numeric</span><span class="special">::</span><span class="identifier">sign_mixture_enum</span></code></a>
    152. 

  152.         </p>
    153. 

  153. </div>
    154. 

  154. <div class="section">
    155. 

  155. <div class="titlepage"><div><div><h4 class="title">
    156. 

  156. <a name="boost_numericconversion.conversion_traits___traits_class.types.template_class_udt_builtin_mixture__"></a><a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_udt_builtin_mixture__" title="template class udt_builtin_mixture&lt;&gt;">template
    157. 

  157.         class udt_builtin_mixture&lt;&gt;</a>
    158. 

  158. </h4></div></div></div>
    159. 

  159. <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">numeric</span> <span class="special">{</span>
    160. 

  160. 

  161.     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">S</span><span class="special">&gt;</span>
    162. 

  162.     <span class="keyword">struct</span> <span class="identifier">udt_builtin_mixture</span> <span class="special">:</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">integral_c</span><span class="special">&lt;</span><span class="identifier">udt_builtin__mixture_enum</span><span class="special">,</span> <span class="identifier">impl</span><span class="special">-</span><span class="identifier">def</span><span class="special">-</span><span class="identifier">value</span><span class="special">&gt;</span> <span class="special">{}</span> <span class="special">;</span>
    163. 

  163. 

  164. <span class="special">}</span> <span class="special">}</span> <span class="comment">// namespace boost::numeric</span>
    165. 

  165. </pre>
    166. 

  166. <p>
    167. 

  167.           Classifying <code class="computeroutput"><span class="identifier">S</span></code> and <code class="computeroutput"><span class="identifier">T</span></code> as either user-defined or builtin,
    168. 

  168.           this <a href="../../../../../mpl/doc/refmanual/integral-constant.html" target="_top">MPL's
    169. 

  169.           Integral Constant</a> indicates the combination of these attributes.
    170. 

  170.         </p>
    171. 

  171. <p>
    172. 

  172.           Its <code class="computeroutput"><span class="special">::</span><span class="identifier">value</span></code>
    173. 

  173.           is of enumeration type <a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.enumeration_udt_builtin_mixture_enum" title="enumeration udt_builtin_mixture_enum"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">numeric</span><span class="special">::</span><span class="identifier">udt_builtin_mixture_enum</span></code></a>
    174. 

  174.         </p>
    175. 

  175. </div>
    176. 

  176. <div class="section">
    177. 

  177. <div class="titlepage"><div><div><h4 class="title">
    178. 

  178. <a name="boost_numericconversion.conversion_traits___traits_class.types.template_class_is_subranged__"></a><a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_is_subranged__" title="template class is_subranged&lt;&gt;">template
    179. 

  179.         class is_subranged&lt;&gt;</a>
    180. 

  180. </h4></div></div></div>
    181. 

  181. <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">numeric</span> <span class="special">{</span>
    182. 

  182. 

  183.     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">S</span><span class="special">&gt;</span>
    184. 

  184.     <span class="keyword">struct</span> <span class="identifier">is_subranged</span> <span class="special">:</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">bool_</span><span class="special">&lt;</span><span class="identifier">impl</span><span class="special">-</span><span class="identifier">def</span><span class="special">-</span><span class="identifier">value</span><span class="special">&gt;</span> <span class="special">{}</span> <span class="special">;</span>
    185. 

  185. 

  186. <span class="special">}</span> <span class="special">}</span> <span class="comment">// namespace boost::numeric</span>
    187. 

  187. </pre>
    188. 

  188. <p>
    189. 

  189.           Indicates if the range of the target type <code class="computeroutput"><span class="identifier">T</span></code>
    190. 

  190.           is a subset of the range of the source type <code class="computeroutput"><span class="identifier">S</span></code>.
    191. 

  191.           That is: if there are some source values which fall out of the Target type's
    192. 

  192.           range.
    193. 

  193.         </p>
    194. 

  194. <p>
    195. 

  195.           It is a boolean <a href="../../../../../mpl/doc/refmanual/integral-constant.html" target="_top">MPL's
    196. 

  196.           Integral Constant</a> .
    197. 

  197.         </p>
    198. 

  198. <p>
    199. 

  199.           It does not indicate if a particular conversion is effectively out of range;
    200. 

  200.           it indicates that some conversion might be out of range because not all
    201. 

  201.           the source values are representable as Target type.
    202. 

  202.         </p>
    203. 

  203. </div>
    204. 

  204. <div class="section">
    205. 

  205. <div class="titlepage"><div><div><h4 class="title">
    206. 

  206. <a name="boost_numericconversion.conversion_traits___traits_class.types.template_class_conversion_traits__"></a><a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_conversion_traits__" title="template class conversion_traits&lt;&gt;">template
    207. 

  207.         class conversion_traits&lt;&gt;</a>
    208. 

  208. </h4></div></div></div>
    209. 

  209. <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">numeric</span> <span class="special">{</span>
    210. 

  210. 

  211.     <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">S</span><span class="special">&gt;</span>
    212. 

  212.     <span class="keyword">struct</span> <span class="identifier">conversion_traits</span>
    213. 

  213.     <span class="special">{</span>
    214. 

  214.         <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">integral_c</span><span class="special">&lt;</span><span class="identifier">int_float_mixture_enum</span>  <span class="special">,</span> <span class="special">...&gt;</span> <span class="identifier">int_float_mixture</span> <span class="special">;</span>
    215. 

  215.         <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">integral_c</span><span class="special">&lt;</span><span class="identifier">sign_mixture_enum</span>       <span class="special">,</span> <span class="special">...&gt;</span> <span class="identifier">sign_mixture</span><span class="special">;</span>
    216. 

  216.         <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">integral_c</span><span class="special">&lt;</span><span class="identifier">udt_builtin_mixture_enum</span><span class="special">,</span> <span class="special">...&gt;</span> <span class="identifier">udt_builtin_mixture</span> <span class="special">;</span>
    217. 

  217. 

  218.         <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">bool_</span><span class="special">&lt;...&gt;</span> <span class="identifier">subranged</span> <span class="special">;</span>
    219. 

  219.         <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">bool_</span><span class="special">&lt;...&gt;</span> <span class="identifier">trivial</span> <span class="special">;</span>
    220. 

  220. 

  221.         <span class="keyword">typedef</span> <span class="identifier">T</span> <span class="identifier">target_type</span>   <span class="special">;</span>
    222. 

  222.         <span class="keyword">typedef</span> <span class="identifier">S</span> <span class="identifier">source_type</span>   <span class="special">;</span>
    223. 

  223.         <span class="keyword">typedef</span> <span class="special">...</span> <span class="identifier">argument_type</span> <span class="special">;</span>
    224. 

  224.         <span class="keyword">typedef</span> <span class="special">...</span> <span class="identifier">result_type</span>   <span class="special">;</span>
    225. 

  225.         <span class="keyword">typedef</span> <span class="special">...</span> <span class="identifier">supertype</span>     <span class="special">;</span>
    226. 

  226.         <span class="keyword">typedef</span> <span class="special">...</span> <span class="identifier">subtype</span>       <span class="special">;</span>
    227. 

  227.     <span class="special">}</span> <span class="special">;</span>
    228. 

  228. 

  229. <span class="special">}</span> <span class="special">}</span> <span class="comment">// namespace numeric, namespace boost</span>
    230. 

  230. </pre>
    231. 

  231. <p>
    232. 

  232.           This traits class indicates some properties of a <span class="emphasis"><em>numeric conversion</em></span>
    233. 

  233.           direction: from a source type <code class="computeroutput"><span class="identifier">S</span></code>
    234. 

  234.           to a target type <code class="computeroutput"><span class="identifier">T</span></code>. It
    235. 

  235.           does not indicate the properties of a <span class="emphasis"><em>specific</em></span> conversion,
    236. 

  236.           but of the conversion direction. See <a class="link" href="definitions.html#boost_numericconversion.definitions.subranged_conversion_direction__subtype_and_supertype" title="Subranged Conversion Direction, Subtype and Supertype">Definitions</a>
    237. 

  237.           for details.
    238. 

  238.         </p>
    239. 

  239. <p>
    240. 

  240.           The traits class provides the following <a href="../../../../../mpl/doc/refmanual/integral-constant.html" target="_top">MPL's
    241. 

  241.           Integral Constant</a> \s of enumeration type. They express the combination
    242. 

  242.           of certain attributes of the Source and Target types (thus they are call
    243. 

  243.           mixture):
    244. 

  244.         </p>
    245. 

  245. <div class="informaltable"><table class="table">
    246. 

  246. <colgroup>
    247. 

  247. <col>
    248. 

  248. <col>
    249. 

  249. </colgroup>
    250. 

  250. <thead><tr>
    251. 

  251. <th>
    252. 

  252.                 </th>
    253. 

  253. <th>
    254. 

  254.                 </th>
    255. 

  255. </tr></thead>
    256. 

  256. <tbody>
    257. 

  257. <tr>
    258. 

  258. <td>
    259. 

  259.                   <p>
    260. 

  260.                     <span class="bold"><strong>int_float_mixture </strong></span>
    261. 

  261.                   </p>
    262. 

  262.                 </td>
    263. 

  263. <td>
    264. 

  264.                   <p>
    265. 

  265.                     Same as given by the traits class <a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_int_float_mixture__" title="template class int_float_mixture&lt;&gt;">int_float_mixture</a>
    266. 

  266.                   </p>
    267. 

  267.                 </td>
    268. 

  268. </tr>
    269. 

  269. <tr>
    270. 

  270. <td>
    271. 

  271.                   <p>
    272. 

  272.                     <span class="bold"><strong>sign_mixture </strong></span>
    273. 

  273.                   </p>
    274. 

  274.                 </td>
    275. 

  275. <td>
    276. 

  276.                   <p>
    277. 

  277.                     Same as given by the traits class <a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_sign_mixture__" title="template class sign_mixture&lt;&gt;">sign_mixture</a>
    278. 

  278.                   </p>
    279. 

  279.                 </td>
    280. 

  280. </tr>
    281. 

  281. <tr>
    282. 

  282. <td>
    283. 

  283.                   <p>
    284. 

  284.                     <span class="bold"><strong>udt_builtin_mixture </strong></span>
    285. 

  285.                   </p>
    286. 

  286.                 </td>
    287. 

  287. <td>
    288. 

  288.                   <p>
    289. 

  289.                     Same as given by the traits class <a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_udt_builtin_mixture__" title="template class udt_builtin_mixture&lt;&gt;">udt_builtin_mixture</a>
    290. 

  290.                   </p>
    291. 

  291.                 </td>
    292. 

  292. </tr>
    293. 

  293. </tbody>
    294. 

  294. </table></div>
    295. 

  295. <p>
    296. 

  296.           The traits class provides the following <a href="../../../../../mpl/doc/refmanual/integral-constant.html" target="_top">MPL's
    297. 

  297.           Integral Constant</a> \s of boolean type which indicates indirectly
    298. 

  298.           the relation between the Source and Target ranges (see <a class="link" href="definitions.html#boost_numericconversion.definitions.range_and_precision" title="Range and Precision">Definitions</a>
    299. 

  299.           for details).
    300. 

  300.         </p>
    301. 

  301. <div class="informaltable"><table class="table">
    302. 

  302. <colgroup>
    303. 

  303. <col>
    304. 

  304. <col>
    305. 

  305. </colgroup>
    306. 

  306. <thead><tr>
    307. 

  307. <th>
    308. 

  308.                 </th>
    309. 

  309. <th>
    310. 

  310.                 </th>
    311. 

  311. </tr></thead>
    312. 

  312. <tbody>
    313. 

  313. <tr>
    314. 

  314. <td>
    315. 

  315.                   <p>
    316. 

  316.                     subranged
    317. 

  317.                   </p>
    318. 

  318.                 </td>
    319. 

  319. <td>
    320. 

  320.                   <p>
    321. 

  321.                     Same as given by <a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.types.template_class_is_subranged__" title="template class is_subranged&lt;&gt;">is_subranged</a>
    322. 

  322.                   </p>
    323. 

  323.                 </td>
    324. 

  324. </tr>
    325. 

  325. <tr>
    326. 

  326. <td>
    327. 

  327.                   <p>
    328. 

  328.                     trivial
    329. 

  329.                   </p>
    330. 

  330.                 </td>
    331. 

  331. <td>
    332. 

  332.                   <p>
    333. 

  333.                     Indicates if both Source and Target, <span class="underline">without
    334. 

  334.                     cv-qualifications</span>, are the same type.
    335. 

  335.                   </p>
    336. 

  336.                   <p>
    337. 

  337.                     Its <code class="computeroutput"><span class="special">::</span><span class="identifier">value</span></code>
    338. 

  338.                     is of boolean type.
    339. 

  339.                   </p>
    340. 

  340.                 </td>
    341. 

  341. </tr>
    342. 

  342. </tbody>
    343. 

  343. </table></div>
    344. 

  344. <p>
    345. 

  345.           The traits class provides the following types. They are the Source and
    346. 

  346.           Target types classified and qualified for different purposes.
    347. 

  347.         </p>
    348. 

  348. <div class="informaltable"><table class="table">
    349. 

  349. <colgroup>
    350. 

  350. <col>
    351. 

  351. <col>
    352. 

  352. </colgroup>
    353. 

  353. <thead><tr>
    354. 

  354. <th>
    355. 

  355.                 </th>
    356. 

  356. <th>
    357. 

  357.                 </th>
    358. 

  358. </tr></thead>
    359. 

  359. <tbody>
    360. 

  360. <tr>
    361. 

  361. <td>
    362. 

  362.                   <p>
    363. 

  363.                     <span class="bold"><strong>target_type</strong></span>
    364. 

  364.                   </p>
    365. 

  365.                 </td>
    366. 

  366. <td>
    367. 

  367.                   <p>
    368. 

  368.                     The template parameter <code class="computeroutput"><span class="identifier">T</span></code>
    369. 

  369.                     without cv-qualifications
    370. 

  370.                   </p>
    371. 

  371.                 </td>
    372. 

  372. </tr>
    373. 

  373. <tr>
    374. 

  374. <td>
    375. 

  375.                   <p>
    376. 

  376.                     <span class="bold"><strong>source_type</strong></span>
    377. 

  377.                   </p>
    378. 

  378.                 </td>
    379. 

  379. <td>
    380. 

  380.                   <p>
    381. 

  381.                     The template parameter <code class="computeroutput"><span class="identifier">S</span></code>
    382. 

  382.                     without cv-qualifications
    383. 

  383.                   </p>
    384. 

  384.                 </td>
    385. 

  385. </tr>
    386. 

  386. <tr>
    387. 

  387. <td>
    388. 

  388.                   <p>
    389. 

  389.                     <span class="bold"><strong>argument_type</strong></span>
    390. 

  390.                   </p>
    391. 

  391.                 </td>
    392. 

  392. <td>
    393. 

  393.                   <p>
    394. 

  394.                     This type is either source_type or <code class="computeroutput"><span class="identifier">source_type</span>
    395. 

  395.                     <span class="keyword">const</span><span class="special">&amp;</span></code>.
    396. 

  396.                   </p>
    397. 

  397.                   <p>
    398. 

  398.                     It represents the optimal argument type for the <a class="link" href="converter___function_object.html" title="converter&lt;&gt; function object">converter</a>
    399. 

  399.                     member functions.
    400. 

  400.                   </p>
    401. 

  401.                   <p>
    402. 

  402.                     If S is a built-in type, this is <code class="computeroutput"><span class="identifier">source_type</span></code>,
    403. 

  403.                     otherwise, this is <code class="computeroutput"><span class="identifier">source_type</span>
    404. 

  404.                     <span class="keyword">const</span><span class="special">&amp;</span></code>.
    405. 

  405.                   </p>
    406. 

  406.                 </td>
    407. 

  407. </tr>
    408. 

  408. <tr>
    409. 

  409. <td>
    410. 

  410.                   <p>
    411. 

  411.                     <span class="bold"><strong>result_type</strong></span>
    412. 

  412.                   </p>
    413. 

  413.                 </td>
    414. 

  414. <td>
    415. 

  415.                   <p>
    416. 

  416.                     This type is either target_type or target_type const&amp;
    417. 

  417.                   </p>
    418. 

  418.                   <p>
    419. 

  419.                     It represents the return type of the <a class="link" href="converter___function_object.html" title="converter&lt;&gt; function object">converter</a>
    420. 

  420.                     member functions.
    421. 

  421.                   </p>
    422. 

  422.                   <p>
    423. 

  423.                     If <code class="computeroutput"><span class="identifier">T</span><span class="special">==</span><span class="identifier">S</span></code>, it is <code class="computeroutput"><span class="identifier">target_type</span>
    424. 

  424.                     <span class="keyword">const</span><span class="special">&amp;</span></code>,
    425. 

  425.                     otherwise, it is <code class="computeroutput"><span class="identifier">target_type</span></code>.
    426. 

  426.                   </p>
    427. 

  427.                 </td>
    428. 

  428. </tr>
    429. 

  429. <tr>
    430. 

  430. <td>
    431. 

  431.                   <p>
    432. 

  432.                     <span class="bold"><strong>supertype</strong></span>
    433. 

  433.                   </p>
    434. 

  434.                 </td>
    435. 

  435. <td>
    436. 

  436.                   <p>
    437. 

  437.                     If the conversion is subranged, it is <code class="computeroutput"><span class="identifier">source_type</span></code>,
    438. 

  438.                     otherwise, it is <code class="computeroutput"><span class="identifier">target_type</span></code>
    439. 

  439.                   </p>
    440. 

  440.                 </td>
    441. 

  441. </tr>
    442. 

  442. <tr>
    443. 

  443. <td>
    444. 

  444.                   <p>
    445. 

  445.                     <span class="bold"><strong>subtype</strong></span>
    446. 

  446.                   </p>
    447. 

  447.                 </td>
    448. 

  448. <td>
    449. 

  449.                   <p>
    450. 

  450.                     If the conversion is subranged, it is <code class="computeroutput"><span class="identifier">target_type</span></code>,
    451. 

  451.                     otherwise, it is <code class="computeroutput"><span class="identifier">source_type</span></code>
    452. 

  452.                   </p>
    453. 

  453.                 </td>
    454. 

  454. </tr>
    455. 

  455. </tbody>
    456. 

  456. </table></div>
    457. 

  457. </div>
    458. 

  458. </div>
    459. 

  459. <div class="section">
    460. 

  460. <div class="titlepage"><div><div><h3 class="title">
    461. 

  461. <a name="boost_numericconversion.conversion_traits___traits_class.examples"></a><a class="link" href="conversion_traits___traits_class.html#boost_numericconversion.conversion_traits___traits_class.examples" title="Examples">Examples</a>
    462. 

  462. </h3></div></div></div>
    463. 

  463. <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">cassert</span><span class="special">&gt;</span>
    464. 

  464. <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">typeinfo</span><span class="special">&gt;</span>
    465. 

  465. <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">numeric</span><span class="special">/</span><span class="identifier">conversion</span><span class="special">/</span><span class="identifier">conversion_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
    466. 

  466. 

  467. <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
    468. 

  468. <span class="special">{</span>
    469. 

  469. 

  470.     <span class="comment">// A trivial conversion.</span>
    471. 

  471.     <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">numeric</span><span class="special">::</span><span class="identifier">conversion_traits</span><span class="special">&lt;</span><span class="keyword">short</span><span class="special">,</span><span class="keyword">short</span><span class="special">&gt;</span> <span class="identifier">Short2Short_Traits</span> <span class="special">;</span>
    472. 

  472.     <span class="identifier">assert</span> <span class="special">(</span> <span class="identifier">Short2Short_Traits</span><span class="special">::</span><span class="identifier">trivial</span><span class="special">::</span><span class="identifier">value</span> <span class="special">)</span> <span class="special">;</span>
    473. 

  473. 

  474.     <span class="comment">// A subranged conversion.</span>
    475. 

  475.     <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">numeric</span><span class="special">::</span><span class="identifier">conversion_traits</span><span class="special">&lt;</span><span class="keyword">double</span><span class="special">,</span><span class="keyword">unsigned</span> <span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">UInt2Double_Traits</span> <span class="special">;</span>
    476. 

  476.     <span class="identifier">assert</span> <span class="special">(</span>  <span class="identifier">UInt2Double_Traits</span><span class="special">::</span><span class="identifier">int_float_mixture</span><span class="special">::</span><span class="identifier">value</span> <span class="special">==</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">numeric</span><span class="special">::</span><span class="identifier">integral_to_float</span> <span class="special">)</span> <span class="special">;</span>
    477. 

  477.     <span class="identifier">assert</span> <span class="special">(</span>  <span class="identifier">UInt2Double_Traits</span><span class="special">::</span><span class="identifier">sign_mixture</span><span class="special">::</span><span class="identifier">value</span> <span class="special">==</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">numeric</span><span class="special">::</span><span class="identifier">unsigned_to_signed</span> <span class="special">)</span> <span class="special">;</span>
    478. 

  478.     <span class="identifier">assert</span> <span class="special">(</span> <span class="special">!</span><span class="identifier">UInt2Double_Traits</span><span class="special">::</span><span class="identifier">subranged</span><span class="special">::</span><span class="identifier">value</span> <span class="special">)</span> <span class="special">;</span>
    479. 

  479.     <span class="identifier">assert</span> <span class="special">(</span> <span class="keyword">typeid</span><span class="special">(</span><span class="identifier">UInt2Double_Traits</span><span class="special">::</span><span class="identifier">supertype</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">typeid</span><span class="special">(</span><span class="keyword">double</span><span class="special">)</span> <span class="special">)</span> <span class="special">;</span>
    480. 

  480.     <span class="identifier">assert</span> <span class="special">(</span> <span class="keyword">typeid</span><span class="special">(</span><span class="identifier">UInt2Double_Traits</span><span class="special">::</span><span class="identifier">subtype</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">typeid</span><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">int</span><span class="special">)</span> <span class="special">)</span> <span class="special">;</span>
    481. 

  481. 

  482.     <span class="comment">// A doubly subranged conversion.</span>
    483. 

  483.     <span class="identifier">assert</span> <span class="special">(</span> <span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">numeric</span><span class="special">::</span><span class="identifier">conversion_traits</span><span class="special">&lt;</span><span class="keyword">short</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">short</span><span class="special">&gt;::</span><span class="identifier">subranged</span><span class="special">::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">);</span>
    484. 

  484.     <span class="identifier">assert</span> <span class="special">(</span> <span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">numeric</span><span class="special">::</span><span class="identifier">conversion_traits</span><span class="special">&lt;</span><span class="keyword">unsigned</span> <span class="keyword">short</span><span class="special">,</span> <span class="keyword">short</span><span class="special">&gt;::</span><span class="identifier">subranged</span><span class="special">::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">);</span>
    485. 

  485. 

  486.     <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
    487. 

  487. <span class="special">}</span>
    488. 

  488. </pre>
    489. 

  489. </div>
    490. 

  490. </div>
    491. 

  491. <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
    492. 

  492. <td align="left"></td>
    493. 

  493. <td align="right"><div class="copyright-footer">Copyright &#169; 2004-2007 Fernando
    494. 

  494.       Luis Cacciola Carballal<p>
    495. 

  495.         Distributed under the Boost Software License, Version 1.0. (See accompanying
    496. 

  496.         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>)
    497. 

  497.       </p>
    498. 

  498. </div></td>
    499. 

  499. </tr></table>
    500. 

  500. <hr>
    501. 

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