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Micro template library A library for building device drivers
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  93. <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>&#160;</div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="preprocessor">#ifndef __utl_meta_sfinae_h__</span></div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor">#define __utl_meta_sfinae_h__</span></div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;</div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="impl_8h.html">utl/core/impl.h</a>&gt;</span></div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor">#include &lt;type_traits&gt;</span></div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<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>&#160;<span class="keyword">namespace </span>meta {</div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;   <span class="keyword">namespace </span>detail {</div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment">//      template &lt;typename... T&gt;</span></div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment">//      struct dev_null { using type = dev_null; };  //&lt; Same as typelist</span></div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;</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>&#160;      <span class="keyword">template</span> &lt;<span class="keywordtype">bool</span> If&gt;  <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>&#160;      <span class="keyword">template</span> &lt;&gt;         <span class="keyword">struct </span><a class="code" href="structutl_1_1meta_1_1detail_1_1when__.html">when_</a>&lt;true&gt; { <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>&#160;   }</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;   <span class="keyword">template</span> &lt;<span class="keywordtype">bool</span> If&gt;</div><div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="namespaceutl_1_1meta.html#a181d79db46b10170529e85b907ed3dc7">   46</a></span>&#160;   <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&lt; detail::when_&lt;If&gt;</a> &gt;;</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<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>&#160;<span class="comment">//   template &lt;bool ...Ifs&gt;</span></div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="comment">//   using when_all = detail::dev_null&lt;</span></div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment">//         when&lt;Ifs&gt;...</span></div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="comment">//   &gt;;</span></div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;</div><div class="line"><a name="l00060"></a><span class="lineno"><a class="line" href="namespaceutl_1_1meta.html#ab3fed26a4c7a8204accb349f0b6600e8">   60</a></span>&#160;   <span class="keyword">template</span> &lt;<span class="keywordtype">bool</span> If, <span class="keyword">typename</span> _Tp = <span class="keywordtype">void</span>&gt;   <span class="keyword">using</span> <a class="code" href="namespaceutl_1_1meta.html#ab3fed26a4c7a8204accb349f0b6600e8">enable_if</a> = std::enable_if&lt;If, _Tp&gt;;</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;</div><div class="line"><a name="l00063"></a><span class="lineno"><a class="line" href="namespaceutl_1_1meta.html#a372fe391d9567f66a81091f581e1fa01">   63</a></span>&#160;   <span class="keyword">template</span>&lt;<span class="keywordtype">bool</span> If, <span class="keyword">typename</span> _Tp = <span class="keywordtype">void</span>&gt;    <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&lt; enable_if&lt;If, _Tp&gt;</a> &gt;;</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;}}</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<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_&lt; true &gt;::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>

  94. <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&lt; If, _Tp &gt; 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>

  95. <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>

  96. <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>

  97. <div class="ttc" id="namespaceutl_html"><div class="ttname"><a href="namespaceutl.html">utl</a></div><div class="ttdoc">STL&amp;#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>

  98. <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&lt; enable_if&lt; If, _Tp &gt; &gt; 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>

  99. <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&lt; detail::when_&lt; If &gt; &gt; 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>

  100. <div class="ttc" id="impl_8h_html"><div class="ttname"><a href="impl_8h.html">impl.h</a></div><div class="ttdoc">Implementation detail main forward header. </div></div>

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