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26 | <div class="titlepage"><div><div><h2 class="title" style="clear: both"> | |
27 | <a name="boost_typetraits.user_defined"></a><a class="link" href="user_defined.html" title="User Defined Specializations">User Defined Specializations</a> | |
28 | </h2></div></div></div> | |
29 | <p> | |
30 | Occationally the end user may need to provide their own specialization for | |
31 | one of the type traits - typically where intrinsic compiler support is required | |
32 | to implement a specific trait fully. These specializations should derive from | |
33 | boost::<a class="link" href="reference/integral_constant.html" title="integral_constant">true_type</a> | |
34 | or boost::<a class="link" href="reference/integral_constant.html" title="integral_constant">false_type</a> | |
35 | as appropriate: | |
36 | </p> | |
37 | <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">is_pod</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
38 | <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">is_class</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
39 | <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">is_union</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
40 | ||
41 | <span class="keyword">struct</span> <span class="identifier">my_pod</span><span class="special">{};</span> | |
42 | <span class="keyword">struct</span> <span class="identifier">my_union</span> | |
43 | <span class="special">{</span> | |
44 | <span class="keyword">char</span> <span class="identifier">c</span><span class="special">;</span> | |
45 | <span class="keyword">int</span> <span class="identifier">i</span><span class="special">;</span> | |
46 | <span class="special">};</span> | |
47 | ||
48 | <span class="keyword">namespace</span> <span class="identifier">boost</span> | |
49 | <span class="special">{</span> | |
50 | <span class="keyword">template</span><span class="special"><></span> | |
51 | <span class="keyword">struct</span> <a class="link" href="reference/is_pod.html" title="is_pod">is_pod</a><span class="special"><</span><span class="identifier">my_pod</span><span class="special">></span> <span class="special">:</span> <span class="keyword">public</span> <a class="link" href="reference/integral_constant.html" title="integral_constant">true_type</a><span class="special">{};</span> | |
52 | ||
53 | <span class="keyword">template</span><span class="special"><></span> | |
54 | <span class="keyword">struct</span> <a class="link" href="reference/is_pod.html" title="is_pod">is_pod</a><span class="special"><</span><span class="identifier">my_union</span><span class="special">></span> <span class="special">:</span> <span class="keyword">public</span> <a class="link" href="reference/integral_constant.html" title="integral_constant">true_type</a><span class="special">{};</span> | |
55 | ||
56 | <span class="keyword">template</span><span class="special"><></span> | |
57 | <span class="keyword">struct</span> <a class="link" href="reference/is_union.html" title="is_union">is_union</a><span class="special"><</span><span class="identifier">my_union</span><span class="special">></span> <span class="special">:</span> <span class="keyword">public</span> <a class="link" href="reference/integral_constant.html" title="integral_constant">true_type</a><span class="special">{};</span> | |
58 | ||
59 | <span class="keyword">template</span><span class="special"><></span> | |
60 | <span class="keyword">struct</span> <a class="link" href="reference/is_class.html" title="is_class">is_class</a><span class="special"><</span><span class="identifier">my_union</span><span class="special">></span> <span class="special">:</span> <span class="keyword">public</span> <a class="link" href="reference/integral_constant.html" title="integral_constant">false_type</a><span class="special">{};</span> | |
61 | <span class="special">}</span> | |
62 | </pre> | |
63 | </div> | |
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