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<a href="sfinae_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#ifndef __utl_meta_sfinae_h__</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#define __utl_meta_sfinae_h__</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <<a class="code" href="impl_8h.html">utl/core/impl.h</a>></span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <type_traits></span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="keyword">namespace </span><a class="code" href="namespaceutl.html">utl</a> {</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="keyword">namespace </span>meta {</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment">// template <typename... T></span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">// struct dev_null { using type = dev_null; }; //< Same as typelist</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div><div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="structutl_1_1meta_1_1detail_1_1when__.html"> 41</a></span>  <span class="keyword">template</span> <<span class="keywordtype">bool</span> If> <span class="keyword">struct </span><a class="code" href="structutl_1_1meta_1_1detail_1_1when__.html">when_</a> { };</div><div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="structutl_1_1meta_1_1detail_1_1when___3_01true_01_4.html#a2d6b156939c43f8236a109310733323c"> 42</a></span>  <span class="keyword">template</span> <> <span class="keyword">struct </span><a class="code" href="structutl_1_1meta_1_1detail_1_1when__.html">when_</a><true> { <span class="keyword">using</span> <a class="code" href="structutl_1_1meta_1_1detail_1_1when___3_01true_01_4.html#a2d6b156939c43f8236a109310733323c">type</a> = void; };</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  }</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keyword">template</span> <<span class="keywordtype">bool</span> If></div><div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="namespaceutl_1_1meta.html#a181d79db46b10170529e85b907ed3dc7"> 46</a></span>  <span class="keyword">using</span> <a class="code" href="namespaceutl_1_1meta.html#a181d79db46b10170529e85b907ed3dc7">when</a> = <a class="code" href="namespaceutl_1_1meta.html#aa5a37adba244ff4286f994111c4c02ea">eval< detail::when_<If></a> >;</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// //! Well formed only if all of \p Ifs are \c true</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">// template <bool ...Ifs></span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment">// using when_all = detail::dev_null<</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment">// when<Ifs>...</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment">// >;</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div><div class="line"><a name="l00060"></a><span class="lineno"><a class="line" href="namespaceutl_1_1meta.html#ab3fed26a4c7a8204accb349f0b6600e8"> 60</a></span>  <span class="keyword">template</span> <<span class="keywordtype">bool</span> If, <span class="keyword">typename</span> _Tp = <span class="keywordtype">void</span>> <span class="keyword">using</span> <a class="code" href="namespaceutl_1_1meta.html#ab3fed26a4c7a8204accb349f0b6600e8">enable_if</a> = std::enable_if<If, _Tp>;</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div><div class="line"><a name="l00063"></a><span class="lineno"><a class="line" href="namespaceutl_1_1meta.html#a372fe391d9567f66a81091f581e1fa01"> 63</a></span>  <span class="keyword">template</span><<span class="keywordtype">bool</span> If, <span class="keyword">typename</span> _Tp = <span class="keywordtype">void</span>> <span class="keyword">using</span> <a class="code" href="namespaceutl_1_1meta.html#a372fe391d9567f66a81091f581e1fa01">enable_if_t</a> = <a class="code" href="namespaceutl_1_1meta.html#aa5a37adba244ff4286f994111c4c02ea">eval< enable_if<If, _Tp></a> >;</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> }}</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="preprocessor">#endif </span><span class="comment">/* __utl_meta_sfinae_h__ */</span><span class="preprocessor"></span></div><div class="ttc" id="structutl_1_1meta_1_1detail_1_1when___3_01true_01_4_html_a2d6b156939c43f8236a109310733323c"><div class="ttname"><a href="structutl_1_1meta_1_1detail_1_1when___3_01true_01_4.html#a2d6b156939c43f8236a109310733323c">utl::meta::detail::when_< true >::type</a></div><div class="ttdeci">void type</div><div class="ttdef"><b>Definition:</b> <a href="sfinae_8h_source.html#l00042">sfinae.h:42</a></div></div>
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<div class="ttc" id="namespaceutl_1_1meta_html_ab3fed26a4c7a8204accb349f0b6600e8"><div class="ttname"><a href="namespaceutl_1_1meta.html#ab3fed26a4c7a8204accb349f0b6600e8">utl::meta::enable_if</a></div><div class="ttdeci">std::enable_if< If, _Tp > enable_if</div><div class="ttdoc">enable_if, imported from stl </div><div class="ttdef"><b>Definition:</b> <a href="sfinae_8h_source.html#l00060">sfinae.h:60</a></div></div>
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<div class="ttc" id="structutl_1_1meta_1_1detail_1_1when___html"><div class="ttname"><a href="structutl_1_1meta_1_1detail_1_1when__.html">utl::meta::detail::when_</a></div><div class="ttdef"><b>Definition:</b> <a href="sfinae_8h_source.html#l00041">sfinae.h:41</a></div></div>
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<div class="ttc" id="namespaceutl_1_1meta_html_aa5a37adba244ff4286f994111c4c02ea"><div class="ttname"><a href="namespaceutl_1_1meta.html#aa5a37adba244ff4286f994111c4c02ea">utl::meta::eval</a></div><div class="ttdeci">typename Tp::type eval</div><div class="ttdoc">Type alias for Tp::type. Used to evaluate/extract return type of metafunctions. </div><div class="ttdef"><b>Definition:</b> <a href="integral_8h_source.html#l00049">integral.h:49</a></div></div>
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<div class="ttc" id="namespaceutl_html"><div class="ttname"><a href="namespaceutl.html">utl</a></div><div class="ttdoc">STL&#39;s core language concepts. </div><div class="ttdef"><b>Definition:</b> <a href="__1wire_8h_source.html#l00030">_1wire.h:30</a></div></div>
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<div class="ttc" id="namespaceutl_1_1meta_html_a372fe391d9567f66a81091f581e1fa01"><div class="ttname"><a href="namespaceutl_1_1meta.html#a372fe391d9567f66a81091f581e1fa01">utl::meta::enable_if_t</a></div><div class="ttdeci">eval< enable_if< If, _Tp > > enable_if_t</div><div class="ttdoc">alias template for enable_if </div><div class="ttdef"><b>Definition:</b> <a href="sfinae_8h_source.html#l00063">sfinae.h:63</a></div></div>
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<div class="ttc" id="namespaceutl_1_1meta_html_a181d79db46b10170529e85b907ed3dc7"><div class="ttname"><a href="namespaceutl_1_1meta.html#a181d79db46b10170529e85b907ed3dc7">utl::meta::when</a></div><div class="ttdeci">eval< detail::when_< If > > when</div><div class="ttdoc">Well formed only if If is true. </div><div class="ttdef"><b>Definition:</b> <a href="sfinae_8h_source.html#l00046">sfinae.h:46</a></div></div>
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