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Micro template library A library for building device drivers
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  93. <p>Create an invocable from other invocables(quoted metafunctions) by composition. </p><dl class="section note"><dt>Note</dt><dd>This implies from N invocables in <code>Fns</code> the first N-1 has to be unary. Thats because of the "return" type of metafunction. They can only return one type. So for n-ary invocables in the N-1 places the typelist&lt;&gt; is the solution.</dd></dl>

  94. <div class="fragment"><div class="line">static_assert( std::is_same&lt;</div><div class="line">   <a name="a0"></a><a class="code" href="namespaceutl_1_1meta.html#a77630cd8adc01f7193f6cb834313d90f">invoke</a>&lt;<a name="a1"></a><a class="code" href="namespaceutl_1_1meta.html#a4f0c06cabe66bc73b703eb8509c7bb07">compose</a>&lt;quote&lt;F1&gt;, quote&lt;F2&gt;, quote&lt;F3&gt;&gt;, <span class="keywordtype">int</span>&gt;, F1&lt;F2&lt;F3&lt;int&gt;&gt;&gt;</div><div class="line">&gt;, <span class="stringliteral">&quot;&quot;</span>);</div></div><!-- fragment --><div class="fragment"><div class="line"></div><div class="line"><span class="preprocessor">#ifndef __utl_meta_invoke_h__</span></div><div class="line"><span class="preprocessor">#define __utl_meta_invoke_h__</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="impl_8h.html">utl/core/impl.h</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="integral_8h.html">utl/meta/integral.h</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="detection_8h.html">utl/meta/detection.h</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="operations_8h.html">utl/meta/operations.h</a>&gt;</span></div><div class="line"></div><div class="line"><span class="keyword">namespace </span><a class="code" href="namespaceutl.html">utl</a> {</div><div class="line"><span class="keyword">namespace </span>meta{</div><div class="line"></div><div class="line"></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">typename</span> _Tp&gt;</div><div class="line">   <span class="keyword">struct </span>identity {</div><div class="line"><span class="preprocessor">   #if defined (UTL_WORKAROUND_CWG_1558)</span></div><div class="line">      <span class="comment">// redirect unused Ts... via void_t</span></div><div class="line">      <span class="keyword">template</span> &lt;<span class="keyword">typename</span>... Ts&gt;</div><div class="line">      <span class="keyword">using</span> <a name="a2"></a><a class="code" href="structutl_1_1meta_1_1identity.html#ab13e3134ffe9c6fabb22f67d7b87b2dd">apply</a> = <a name="a3"></a><a class="code" href="group__type.html#gaf7089523d21cd405c76985643f31092a">first_of</a>&lt;_Tp, <a name="a4"></a><a class="code" href="group__detection.html#gae7373c997420d16cf37e542eb3cfa3ad">void_t</a>&lt;Ts...&gt;&gt;;   </div><div class="line"><span class="preprocessor">   #else</span></div><div class="line">      <span class="keyword">template</span> &lt;<span class="keyword">typename</span>...&gt;</div><div class="line">      <span class="keyword">using</span> <a class="code" href="structutl_1_1meta_1_1identity.html#ab13e3134ffe9c6fabb22f67d7b87b2dd">apply</a> = _Tp;   </div><div class="line"><span class="preprocessor">   #endif</span></div><div class="line">      <span class="keyword">using</span> <a name="a5"></a><a class="code" href="structutl_1_1meta_1_1identity.html#a9aab221df05f226c227a6e508460f7b7">type</a> = _Tp;    </div><div class="line">   };</div><div class="line"></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">typename</span> _Tp&gt;</div><div class="line">   <span class="keyword">using</span> <a name="a6"></a><a class="code" href="namespaceutl_1_1meta.html#a63c0b6b08f4c1d9bd3c4db7432e9b2af">identity_t</a> = eval&lt;identity&lt;_Tp&gt;&gt;;</div><div class="line"></div><div class="line"></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Fn, <span class="keyword">typename</span>... Args&gt;</div><div class="line">   <span class="keyword">using</span> <a class="code" href="namespaceutl_1_1meta.html#a77630cd8adc01f7193f6cb834313d90f">invoke</a> = <span class="keyword">typename</span> Fn::template <a name="a7"></a><a class="code" href="namespaceutl_1_1meta.html#a3f684549221fac60bc8c7979cb4b98f4">apply</a>&lt;Args...&gt;;</div><div class="line"></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">typename</span> Fn, <span class="keyword">typename</span>... Args&gt;</div><div class="line">   <span class="keyword">using</span> <a name="a8"></a><a class="code" href="namespaceutl_1_1meta.html#ac27f3e5f3ec42921d9f8a6bb85560cf1">invoke_t</a> = <a name="a9"></a><a class="code" href="namespaceutl_1_1meta.html#aa5a37adba244ff4286f994111c4c02ea">eval</a>&lt; <a class="code" href="namespaceutl_1_1meta.html#a77630cd8adc01f7193f6cb834313d90f">invoke</a> &lt;Fn, Args...&gt;&gt;;</div><div class="line"></div><div class="line"></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">template</span> &lt;<span class="keyword">typename</span>...&gt; <span class="keyword">class </span>F&gt;</div><div class="line">   <span class="keyword">struct </span>wrap {</div><div class="line">      <span class="keyword">template</span> &lt;<span class="keyword">typename</span>... Args&gt;</div><div class="line">      <span class="keyword">using</span> <a name="a10"></a><a class="code" href="structutl_1_1meta_1_1wrap.html#a71fe22d6a841f27b891ca3344ee97b07">apply</a> = F&lt;Args...&gt;;</div><div class="line">   };</div><div class="line"></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">template</span> &lt;T...&gt; <span class="keyword">class </span>F&gt;</div><div class="line">   <span class="keyword">struct </span>wrap_i {</div><div class="line">      <span class="comment">// requires meta::Integral</span></div><div class="line">      <span class="keyword">template</span> &lt;<span class="keyword">typename</span>... Ts&gt;</div><div class="line">      <span class="keyword">using</span> <a name="a11"></a><a class="code" href="structutl_1_1meta_1_1wrap__i.html#a14e7ddd17abbcecf2658a3dd4616e0d2">apply</a> = F&lt;Ts::type::value...&gt;;</div><div class="line">   };</div><div class="line"></div><div class="line">   <span class="keyword">namespace </span>detail {</div><div class="line"></div><div class="line">      <span class="keyword">template</span>&lt;<span class="keyword">template</span>&lt;<span class="keyword">typename</span>...&gt; <span class="keyword">class </span>F, <span class="keyword">typename</span>... T&gt;</div><div class="line">      <span class="keyword">struct </span>is_applicable_ {</div><div class="line">         <span class="keyword">template</span>&lt;<span class="keyword">template</span>&lt;<span class="keyword">typename</span>...&gt; <span class="keyword">class </span>G, <span class="keyword">typename</span> = G&lt;T...&gt;&gt;</div><div class="line">            <span class="keyword">static</span> <a name="a12"></a><a class="code" href="namespaceutl_1_1meta.html#ae9a5a8fbe8202785f059935af219fb97">true_</a> <a name="a13"></a><a class="code" href="structutl_1_1meta_1_1detail_1_1is__applicable__.html#abdbf481cbdd5183b42e3cabdb77d282a">check</a> (<span class="keywordtype">int</span>);  <span class="comment">//&lt; T.. can be passed to G</span></div><div class="line">         <span class="keyword">template</span>&lt;<span class="keyword">template</span>&lt;<span class="keyword">typename</span>...&gt; <span class="keyword">class</span>&gt;</div><div class="line">            <span class="keyword">static</span> <a name="a14"></a><a class="code" href="namespaceutl_1_1meta.html#a55511dbaa0adb605ce22dcec11f8d22d">false_</a> <a class="code" href="structutl_1_1meta_1_1detail_1_1is__applicable__.html#abdbf481cbdd5183b42e3cabdb77d282a">check</a> (...); <span class="comment">//&lt; all other combinations</span></div><div class="line"></div><div class="line">         <span class="keyword">using</span> <a name="a15"></a><a class="code" href="structutl_1_1meta_1_1detail_1_1is__applicable__.html#ababc9a374e6321fb8ded4b2dde19795c">type</a> = decltype(check&lt;F&gt;(0));</div><div class="line">      };</div><div class="line"></div><div class="line">      <span class="keyword">template</span>&lt;<span class="keyword">typename</span> F, <span class="keyword">typename</span>... T&gt;</div><div class="line">      <span class="keyword">struct </span>is_applicable_q_ {</div><div class="line">         <span class="keyword">template</span>&lt;<span class="keyword">typename</span> G, <span class="keyword">typename</span> Ret = <a class="code" href="namespaceutl_1_1meta.html#ac27f3e5f3ec42921d9f8a6bb85560cf1">invoke_t</a>&lt;G, T...&gt;&gt;</div><div class="line">            <span class="keyword">static</span> Ret <a name="a16"></a><a class="code" href="structutl_1_1meta_1_1detail_1_1is__applicable__q__.html#a6d258d626fb7889506d8d0c9c6ab14b1">check</a> (<span class="keywordtype">int</span>);    <span class="comment">//&lt; T.. can be passed to G</span></div><div class="line">         <span class="keyword">template</span>&lt;<span class="keyword">typename</span>...&gt;</div><div class="line">            <span class="keyword">static</span> nil_ <a class="code" href="structutl_1_1meta_1_1detail_1_1is__applicable__q__.html#a6d258d626fb7889506d8d0c9c6ab14b1">check</a> (...);   <span class="comment">//&lt; all other combinations</span></div><div class="line"></div><div class="line">         <span class="keyword">using</span> <a name="a17"></a><a class="code" href="structutl_1_1meta_1_1detail_1_1is__applicable__q__.html#a175161a76c46c8da1d170e329d17ce43">type</a> = <a name="a18"></a><a class="code" href="group__type.html#ga39cc4e727a8faa5ea176f543e62c05c0">if_</a> &lt;</div><div class="line">            <a name="a19"></a><a class="code" href="group__integral.html#ga4dfaf054d891eb35d741662b077bbbd2">not_same_</a>&lt;</div><div class="line">               nil_,</div><div class="line">               decltype(check&lt;F&gt;(0))</div><div class="line">            &gt;, <a class="code" href="namespaceutl_1_1meta.html#ae9a5a8fbe8202785f059935af219fb97">true_</a>, <a class="code" href="namespaceutl_1_1meta.html#a55511dbaa0adb605ce22dcec11f8d22d">false_</a></div><div class="line">         &gt;;</div><div class="line">      };</div><div class="line"></div><div class="line">      <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T, <span class="keyword">template</span> &lt;T...&gt; <span class="keyword">class </span>F, T... Is&gt;</div><div class="line">      <span class="keyword">struct </span>is_applicable_i_ {</div><div class="line">         <span class="keyword">template</span>&lt;<span class="keyword">typename</span> TT, <span class="keyword">template</span>&lt;TT...&gt; <span class="keyword">class </span>G, <span class="keyword">typename</span> = G&lt;Is...&gt;&gt;</div><div class="line">            <span class="keyword">static</span> <a class="code" href="namespaceutl_1_1meta.html#ae9a5a8fbe8202785f059935af219fb97">true_</a> <a name="a20"></a><a class="code" href="structutl_1_1meta_1_1detail_1_1is__applicable__i__.html#ac03023fb86dba10d9dfbd0ba553daccd">check</a> (<span class="keywordtype">int</span>);  <span class="comment">//&lt; Is... can be passed to G</span></div><div class="line">         <span class="keyword">template</span>&lt;<span class="keyword">typename</span> TT, <span class="keyword">template</span>&lt;TT...&gt; <span class="keyword">class </span>G&gt;</div><div class="line">            <span class="keyword">static</span> <a class="code" href="namespaceutl_1_1meta.html#a55511dbaa0adb605ce22dcec11f8d22d">false_</a> <a class="code" href="structutl_1_1meta_1_1detail_1_1is__applicable__i__.html#ac03023fb86dba10d9dfbd0ba553daccd">check</a> (...); <span class="comment">//&lt; all other combinations</span></div><div class="line"></div><div class="line">         <span class="keyword">using</span> <a name="a21"></a><a class="code" href="structutl_1_1meta_1_1detail_1_1is__applicable__i__.html#ac512fdc9db578f9244b861f84c177ca7">type</a> = decltype(check&lt;T, F&gt;(0));</div><div class="line">      };</div><div class="line">   }</div><div class="line"></div><div class="line">   <span class="keyword">template</span>&lt;<span class="keyword">template</span>&lt;<span class="keyword">typename</span>...&gt; <span class="keyword">class </span>F, <span class="keyword">typename</span>... T&gt;</div><div class="line">   <span class="keyword">using</span> <a name="a22"></a><a class="code" href="namespaceutl_1_1meta.html#a695a94a2bbe51b0d0eec9bf82214d094">is_applicable_t</a> = <a class="code" href="namespaceutl_1_1meta.html#aa5a37adba244ff4286f994111c4c02ea">eval</a>&lt;</div><div class="line">      detail::is_applicable_&lt;F, T...&gt;</div><div class="line">   &gt;;</div><div class="line">   <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Q, <span class="keyword">typename</span>... T&gt;</div><div class="line">   <span class="keyword">using</span> <a name="a23"></a><a class="code" href="namespaceutl_1_1meta.html#a52c0afa73f63dc889e44cc6cc180f1f8">is_applicable_qt</a> = <a class="code" href="namespaceutl_1_1meta.html#aa5a37adba244ff4286f994111c4c02ea">eval</a> &lt;</div><div class="line">      detail::is_applicable_q_ &lt;Q, T...&gt;</div><div class="line">   &gt;;</div><div class="line"></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">template</span>&lt;T...&gt; <span class="keyword">class </span>F, T... Is&gt;</div><div class="line">   <span class="keyword">using</span> <a name="a24"></a><a class="code" href="namespaceutl_1_1meta.html#add602488265f07c7a3080355350cda70">is_applicable_it</a> = <a class="code" href="namespaceutl_1_1meta.html#aa5a37adba244ff4286f994111c4c02ea">eval</a>&lt;</div><div class="line">      detail::is_applicable_i_&lt;T, F, Is...&gt;</div><div class="line">   &gt;;</div><div class="line"></div><div class="line"></div><div class="line">   <span class="keyword">namespace </span>detail {</div><div class="line">      <span class="keyword">template</span>&lt;<span class="keyword">template</span>&lt;<span class="keyword">typename</span>...&gt; <span class="keyword">class </span>F, <span class="keyword">typename</span>... Ts&gt;</div><div class="line">      <span class="keyword">struct </span>defer_ {</div><div class="line">         <span class="keyword">using</span> <a name="a25"></a><a class="code" href="structutl_1_1meta_1_1detail_1_1defer__.html#ac8e2ede36472a15488ffdb49a6935be2">type</a> = F&lt;Ts...&gt;;</div><div class="line">      };</div><div class="line"></div><div class="line">      <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T, <span class="keyword">template</span>&lt;T...&gt; <span class="keyword">class </span>F, T... Is&gt;</div><div class="line">      <span class="keyword">struct </span>defer_i_ {</div><div class="line">         <span class="keyword">using</span> <a name="a26"></a><a class="code" href="structutl_1_1meta_1_1detail_1_1defer__i__.html#af8659048a08bb48bae5c0dc3f9595bf7">type</a> = F&lt;Is...&gt;;</div><div class="line">      };</div><div class="line"></div><div class="line">   }</div><div class="line"></div><div class="line">   <span class="keyword">template</span>&lt;<span class="keyword">template</span>&lt;<span class="keyword">class</span>...&gt; <span class="keyword">class </span>F, <span class="keyword">class</span>... Ts&gt;</div><div class="line">   <span class="keyword">using</span> <a name="a27"></a><a class="code" href="namespaceutl_1_1meta.html#a48f9a1220931596a9652351d2e7242be">defer</a> = <a class="code" href="group__type.html#ga39cc4e727a8faa5ea176f543e62c05c0">if_</a>&lt;</div><div class="line">      detail::is_applicable_&lt;F, Ts...&gt;,</div><div class="line">      detail::defer_&lt;F, Ts...&gt;,</div><div class="line">      nil_  </div><div class="line">   &gt;;</div><div class="line"></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">template</span>&lt;T...&gt; <span class="keyword">class </span>F, T... Is&gt;</div><div class="line">   <span class="keyword">using</span> <a name="a28"></a><a class="code" href="namespaceutl_1_1meta.html#a01f183f337439e414184beedc9bcf9e3">defer_i</a> = <a class="code" href="group__type.html#ga39cc4e727a8faa5ea176f543e62c05c0">if_</a> &lt;</div><div class="line">      detail::is_applicable_i_&lt;T, F, Is...&gt;,</div><div class="line">      detail::defer_i_&lt;T, F, Is...&gt;,</div><div class="line">      nil_  </div><div class="line">   &gt;;</div><div class="line"></div><div class="line"></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">template</span> &lt;<span class="keyword">typename</span>...&gt; <span class="keyword">class </span>F&gt;</div><div class="line">   <span class="keyword">struct </span>quote {</div><div class="line">      <span class="keyword">template</span> &lt;<span class="keyword">typename</span>... Args&gt;</div><div class="line">      <span class="keyword">using</span> <a name="a29"></a><a class="code" href="structutl_1_1meta_1_1quote.html#a7741173cf865291c89d374c2fac0d17e">apply</a> = <a class="code" href="namespaceutl_1_1meta.html#aa5a37adba244ff4286f994111c4c02ea">eval</a>&lt;</div><div class="line">         <a class="code" href="namespaceutl_1_1meta.html#a48f9a1220931596a9652351d2e7242be">defer</a>&lt;F, Args...&gt;    </div><div class="line">      &gt;;</div><div class="line">   };</div><div class="line"></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">template</span> &lt;T...&gt; <span class="keyword">class </span>F&gt;</div><div class="line">   <span class="keyword">struct </span>quote_i {</div><div class="line">      <span class="comment">// requires meta::Integral</span></div><div class="line">      <span class="keyword">template</span> &lt;<span class="keyword">typename</span>... Ts&gt;</div><div class="line">      <span class="keyword">using</span> <a name="a30"></a><a class="code" href="structutl_1_1meta_1_1quote__i.html#a32099809fbac1c620ad3993e8ab1b8c0">apply</a> = <a class="code" href="namespaceutl_1_1meta.html#aa5a37adba244ff4286f994111c4c02ea">eval</a>&lt;</div><div class="line">         <a class="code" href="namespaceutl_1_1meta.html#a01f183f337439e414184beedc9bcf9e3">defer_i</a>&lt;T, F, Ts::type::value...&gt;  </div><div class="line">      &gt;;</div><div class="line">   };</div><div class="line"></div><div class="line">   <span class="keyword">namespace </span>detail {</div><div class="line">      <span class="keyword">template</span> &lt;<span class="keyword">template</span> &lt;<span class="keyword">typename</span>...&gt; <span class="keyword">class</span>... Fns&gt; <span class="keyword">struct </span>compose_f_ {};</div><div class="line"></div><div class="line">      <span class="comment">// recursive call to all invokes</span></div><div class="line">      <span class="keyword">template</span> &lt;<span class="keyword">template</span> &lt;<span class="keyword">typename</span>...&gt; <span class="keyword">class </span>Fn0,</div><div class="line">                <span class="keyword">template</span> &lt;<span class="keyword">typename</span>...&gt; <span class="keyword">class</span>... Fns&gt;</div><div class="line">      <span class="keyword">struct </span>compose_f_&lt;Fn0, Fns...&gt; {</div><div class="line">         <span class="keyword">template</span> &lt;<span class="keyword">typename</span>... Args&gt;</div><div class="line">         <span class="keyword">using</span> <a class="code" href="namespaceutl_1_1meta.html#a3f684549221fac60bc8c7979cb4b98f4">apply</a> = <a class="code" href="namespaceutl_1_1meta.html#a77630cd8adc01f7193f6cb834313d90f">invoke</a>&lt;</div><div class="line">            quote&lt;Fn0&gt;,</div><div class="line">            <a class="code" href="namespaceutl_1_1meta.html#a77630cd8adc01f7193f6cb834313d90f">invoke</a>&lt;compose_f_&lt;Fns...&gt;, Args...&gt;</div><div class="line">         &gt;;</div><div class="line">      };</div><div class="line">      <span class="comment">// Termination specialization, finally pass the arguments</span></div><div class="line">      <span class="keyword">template</span> &lt;<span class="keyword">template</span> &lt;<span class="keyword">typename</span>...&gt; <span class="keyword">class </span>Fn0&gt;</div><div class="line">      <span class="keyword">struct </span>compose_f_&lt;Fn0&gt; {</div><div class="line">         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> ...Args&gt;</div><div class="line">         <span class="keyword">using</span> <a class="code" href="namespaceutl_1_1meta.html#a3f684549221fac60bc8c7979cb4b98f4">apply</a> = invoke&lt;quote&lt;Fn0&gt;, Args...&gt;;</div><div class="line">      };</div><div class="line"></div><div class="line"></div><div class="line">      <span class="keyword">template</span>&lt;<span class="keyword">typename</span> ...Fns&gt; <span class="keyword">struct </span>compose_ {};</div><div class="line"></div><div class="line">      <span class="comment">// recursive call to all invokes</span></div><div class="line">      <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Fn0, <span class="keyword">typename</span> ...Fns&gt;</div><div class="line">      <span class="keyword">struct </span>compose_&lt;Fn0, Fns...&gt; {</div><div class="line">         <span class="keyword">template</span> &lt;<span class="keyword">typename</span> ...Args&gt;</div><div class="line">         <span class="keyword">using</span> <a class="code" href="namespaceutl_1_1meta.html#a3f684549221fac60bc8c7979cb4b98f4">apply</a> = <a class="code" href="namespaceutl_1_1meta.html#a77630cd8adc01f7193f6cb834313d90f">invoke</a>&lt;</div><div class="line">               Fn0,</div><div class="line">               <a class="code" href="namespaceutl_1_1meta.html#a77630cd8adc01f7193f6cb834313d90f">invoke</a>&lt;compose_&lt;Fns...&gt;, Args...&gt;</div><div class="line">         &gt;;</div><div class="line">      };</div><div class="line">      <span class="comment">// Termination specialization, finally pass the arguments</span></div><div class="line">      <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Fn0&gt;</div><div class="line">      <span class="keyword">struct </span>compose_&lt;Fn0&gt; {</div><div class="line">         <span class="keyword">template</span> &lt;<span class="keyword">typename</span>... Args&gt;</div><div class="line">         <span class="keyword">using</span> <a class="code" href="namespaceutl_1_1meta.html#a3f684549221fac60bc8c7979cb4b98f4">apply</a> = <a class="code" href="namespaceutl_1_1meta.html#a77630cd8adc01f7193f6cb834313d90f">invoke</a>&lt;Fn0, Args...&gt;;</div><div class="line">      };</div><div class="line">   }</div><div class="line"></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">typename</span>... Fns&gt;</div><div class="line">   <span class="keyword">using</span> <a class="code" href="namespaceutl_1_1meta.html#a4f0c06cabe66bc73b703eb8509c7bb07">compose</a> = detail::compose_&lt;Fns...&gt;;</div><div class="line"></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">template</span> &lt;<span class="keyword">typename</span>...&gt; <span class="keyword">class</span>... Fns&gt;</div><div class="line">   <span class="keyword">using</span> <a name="a31"></a><a class="code" href="namespaceutl_1_1meta.html#a729294327829b3068632da1235dc3090">compose_f</a> = detail::compose_f_&lt;Fns...&gt;;</div><div class="line"></div><div class="line">   <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Fn, <span class="keyword">typename</span>... Ts&gt;</div><div class="line">   <span class="keyword">struct </span>bind_front {</div><div class="line">       <span class="keyword">template</span>&lt;<span class="keyword">typename</span>... Us&gt;</div><div class="line">       <span class="keyword">using</span> <a name="a32"></a><a class="code" href="structutl_1_1meta_1_1bind__front.html#a4247cb2b0a19e3168161dead529c532c">apply</a> = <a class="code" href="namespaceutl_1_1meta.html#a77630cd8adc01f7193f6cb834313d90f">invoke</a>&lt;Fn, Ts..., Us...&gt;;</div><div class="line">   };</div><div class="line"></div><div class="line">   <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Fn, <span class="keyword">typename</span>... Ts&gt;</div><div class="line">   <span class="keyword">struct </span>bind_back {</div><div class="line">       <span class="keyword">template</span>&lt;<span class="keyword">typename</span>... Us&gt;</div><div class="line">       <span class="keyword">using</span> <a name="a33"></a><a class="code" href="structutl_1_1meta_1_1bind__back.html#a2f8a5ad9fd3b9e5ed79ace2c18d1ec9a">apply</a> = <a class="code" href="namespaceutl_1_1meta.html#a77630cd8adc01f7193f6cb834313d90f">invoke</a>&lt;Fn, Us..., Ts...&gt;;</div><div class="line">   };</div><div class="line"></div><div class="line"></div><div class="line">   <span class="comment">/*</span></div><div class="line"><span class="comment">    * ========== meta:: predicates ============</span></div><div class="line"><span class="comment">    */</span></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T1&gt;</div><div class="line">   <span class="keyword">struct </span>same_as {</div><div class="line">      <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T2&gt;</div><div class="line">      <span class="keyword">struct </span><a class="code" href="namespaceutl_1_1meta.html#a3f684549221fac60bc8c7979cb4b98f4">apply</a> : same_&lt;T1, T2&gt; { };</div><div class="line">   };</div><div class="line"></div><div class="line">   <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T1&gt;</div><div class="line">   <span class="keyword">struct </span>not_same_as {</div><div class="line">      <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T2&gt;</div><div class="line">      <span class="keyword">struct </span><a class="code" href="namespaceutl_1_1meta.html#a3f684549221fac60bc8c7979cb4b98f4">apply</a> : <a class="code" href="group__integral.html#ga4dfaf054d891eb35d741662b077bbbd2">not_same_</a>&lt;T1, T2&gt; { };</div><div class="line">   };</div><div class="line"></div><div class="line">}}</div><div class="line"></div><div class="line"></div><div class="line"><span class="preprocessor">#endif </span><span class="comment">/* __utl_meta_invoke_h__ */</span><span class="preprocessor"></span></div></div><!-- fragment --> </div><!-- contents -->

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