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   &#160;<span id="projectnumber">1.6.0</span>
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   <div id="projectbrief">Your standard library for metaprogramming</div>
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<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
<p>Implementation details. Do not rely on anything here, even if it is documented. </p>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1detail_1_1any__of.html">boost::hana::detail::any_of&lt; Predicate, T &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns whether the <code>Predicate</code> is satisfied by any of the <code>T...</code>.  <a href="structboost_1_1hana_1_1detail_1_1any__of.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1detail_1_1array.html">boost::hana::detail::array&lt; T, Size &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">A minimal <code><a class="el" href="structstd_1_1array.html" title="Adaptation of std::array for Hana.">std::array</a></code> with better <code>constexpr</code> support.  <a href="structboost_1_1hana_1_1detail_1_1array.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1detail_1_1CanonicalConstant.html">boost::hana::detail::CanonicalConstant&lt; T &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Tag representing a canonical <code>Constant</code>.  <a href="structboost_1_1hana_1_1detail_1_1CanonicalConstant.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1detail_1_1create.html">boost::hana::detail::create&lt; T &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Implementation of the generic <code>std::make_xxx</code> pattern for arbitrary <code>xxx</code>s.  <a href="structboost_1_1hana_1_1detail_1_1create.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1detail_1_1decay.html">boost::hana::detail::decay&lt; T, U &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code>std::decay</code>, except faster.  <a href="structboost_1_1hana_1_1detail_1_1decay.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1detail_1_1first__unsatisfied__index.html">boost::hana::detail::first_unsatisfied_index&lt; Pred &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns the index of the first element which does not satisfy <code>Pred</code>, or <code>sizeof...(Xs)</code> if no such element exists.  <a href="structboost_1_1hana_1_1detail_1_1first__unsatisfied__index.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1detail_1_1has__duplicates.html">boost::hana::detail::has_duplicates&lt; T &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns whether any of the <code>T</code>s are duplicate w.r.t. <code><a class="el" href="group__group-Comparable.html#gacaf1ebea6b3ab96ac9dcb82f0e64e547" title="Returns a Logical representing whether x is equal to y.The equal function can be called in two differ...">hana::equal</a></code>.  <a href="structboost_1_1hana_1_1detail_1_1has__duplicates.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1detail_1_1nested__by.html">boost::hana::detail::nested_by&lt; Algorithm &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Provides a <code>.by</code> static constexpr function object.  <a href="structboost_1_1hana_1_1detail_1_1nested__by.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1detail_1_1nested__than.html">boost::hana::detail::nested_than&lt; Algorithm &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Provides a <code>.than</code> static constexpr function object.  <a href="structboost_1_1hana_1_1detail_1_1nested__than.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1detail_1_1nested__to.html">boost::hana::detail::nested_to&lt; Algorithm &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Provides a <code>.to</code> static constexpr function object.  <a href="structboost_1_1hana_1_1detail_1_1nested__to.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1detail_1_1operators_1_1adl.html">boost::hana::detail::operators::adl&lt;... &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Enables <a href="http://en.cppreference.com/w/cpp/language/adl">ADL</a> in the <code>hana::detail::operators</code> namespace.  <a href="structboost_1_1hana_1_1detail_1_1operators_1_1adl.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1detail_1_1std__common__type.html">boost::hana::detail::std_common_type&lt; T, U, typename &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code>std::common_type</code>, except it is SFINAE-friendly and does not support custom specializations.  <a href="structboost_1_1hana_1_1detail_1_1std__common__type.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1detail_1_1type__at.html">boost::hana::detail::type_at&lt; n, T &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Classic MPL-style metafunction returning the nth element of a type parameter pack.  <a href="structboost_1_1hana_1_1detail_1_1type__at.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
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Macros</h2></td></tr>
<tr class="memitem:ga5de7a0132a80e37c73d544ece1e6dd4e"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__group-details.html#ga5de7a0132a80e37c73d544ece1e6dd4e">BOOST_HANA_DISPATCH_IF</a>(IMPL, ...)&#160;&#160;&#160;IMPL</td></tr>
<tr class="memdesc:ga5de7a0132a80e37c73d544ece1e6dd4e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Dispatch to the given implementation method only when a condition is satisfied.  <a href="#ga5de7a0132a80e37c73d544ece1e6dd4e">More...</a><br /></td></tr>
<tr class="separator:ga5de7a0132a80e37c73d544ece1e6dd4e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga444e73a2fe13732b802a770b55b4a99c"><td class="memItemLeft" align="right" valign="top"><a id="ga444e73a2fe13732b802a770b55b4a99c"></a>
#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__group-details.html#ga444e73a2fe13732b802a770b55b4a99c">BOOST_HANA_PP_CONCAT</a>(x,  y)&#160;&#160;&#160;BOOST_HANA_PP_CONCAT_PRIMITIVE(x, y)</td></tr>
<tr class="memdesc:ga444e73a2fe13732b802a770b55b4a99c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Expands to the concatenation of its two arguments. <br /></td></tr>
<tr class="separator:ga444e73a2fe13732b802a770b55b4a99c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga6b4ca5cb5cefc6cf77455d7d7ef6f381"><td class="memItemLeft" align="right" valign="top"><a id="ga6b4ca5cb5cefc6cf77455d7d7ef6f381"></a>
#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__group-details.html#ga6b4ca5cb5cefc6cf77455d7d7ef6f381">BOOST_HANA_PP_STRINGIZE</a>(...)&#160;&#160;&#160;BOOST_HANA_PP_STRINGIZE_PRIMITIVE(__VA_ARGS__)</td></tr>
<tr class="memdesc:ga6b4ca5cb5cefc6cf77455d7d7ef6f381"><td class="mdescLeft">&#160;</td><td class="mdescRight">Expands to the stringized version of its argument. <br /></td></tr>
<tr class="separator:ga6b4ca5cb5cefc6cf77455d7d7ef6f381"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gaf8319341c937c45415ae0eae8d656723"><td class="memItemLeft" align="right" valign="top"><a id="gaf8319341c937c45415ae0eae8d656723"></a>
#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__group-details.html#gaf8319341c937c45415ae0eae8d656723">BOOST_HANA_PP_FRONT</a>(...)&#160;&#160;&#160;BOOST_HANA_PP_FRONT_IMPL(__VA_ARGS__, )</td></tr>
<tr class="memdesc:gaf8319341c937c45415ae0eae8d656723"><td class="mdescLeft">&#160;</td><td class="mdescRight">Expands to its first argument. <br /></td></tr>
<tr class="separator:gaf8319341c937c45415ae0eae8d656723"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga4bd17b3ef62e1e275dfe485923fdf666"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__group-details.html#ga4bd17b3ef62e1e275dfe485923fdf666">BOOST_HANA_PP_DROP_FRONT</a>(e0, ...)&#160;&#160;&#160;__VA_ARGS__</td></tr>
<tr class="memdesc:ga4bd17b3ef62e1e275dfe485923fdf666"><td class="mdescLeft">&#160;</td><td class="mdescRight">Expands to all of its arguments, except for the first one.  <a href="#ga4bd17b3ef62e1e275dfe485923fdf666">More...</a><br /></td></tr>
<tr class="separator:ga4bd17b3ef62e1e275dfe485923fdf666"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga62fe3327023c37706c827cc82624998b"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__group-details.html#ga62fe3327023c37706c827cc82624998b">BOOST_HANA_PP_NARG</a>(...)&#160;&#160;&#160;BOOST_HANA_PP_NARG_IMPL(__VA_ARGS__, 40,39,38,37,36,35,34,33,32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,)</td></tr>
<tr class="memdesc:ga62fe3327023c37706c827cc82624998b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Macro expanding to the number of arguments it is passed.  <a href="#ga62fe3327023c37706c827cc82624998b">More...</a><br /></td></tr>
<tr class="separator:ga62fe3327023c37706c827cc82624998b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga1be7a4bd805ffff2882fe54995dc41bd"><td class="memItemLeft" align="right" valign="top"><a id="ga1be7a4bd805ffff2882fe54995dc41bd"></a>
#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__group-details.html#ga1be7a4bd805ffff2882fe54995dc41bd">BOOST_HANA_PP_BACK</a>(...)&#160;&#160;&#160;BOOST_HANA_PP_BACK_IMPL(<a class="el" href="group__group-details.html#ga62fe3327023c37706c827cc82624998b">BOOST_HANA_PP_NARG</a>(__VA_ARGS__), __VA_ARGS__)</td></tr>
<tr class="memdesc:ga1be7a4bd805ffff2882fe54995dc41bd"><td class="mdescLeft">&#160;</td><td class="mdescRight">Expands to its last argument. <br /></td></tr>
<tr class="separator:ga1be7a4bd805ffff2882fe54995dc41bd"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gadcf0cf5cb650681b8cac90d94ce52d44"><td class="memItemLeft" align="right" valign="top"><a id="gadcf0cf5cb650681b8cac90d94ce52d44"></a>
#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__group-details.html#gadcf0cf5cb650681b8cac90d94ce52d44">BOOST_HANA_PP_DROP_BACK</a>(...)&#160;&#160;&#160;BOOST_HANA_PP_DROP_BACK_IMPL(<a class="el" href="group__group-details.html#ga62fe3327023c37706c827cc82624998b">BOOST_HANA_PP_NARG</a>(__VA_ARGS__), __VA_ARGS__)</td></tr>
<tr class="memdesc:gadcf0cf5cb650681b8cac90d94ce52d44"><td class="mdescLeft">&#160;</td><td class="mdescRight">Expands to all of its arguments, except for the last one. <br /></td></tr>
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Typedefs</h2></td></tr>
<tr class="memitem:gae85b604ae6c7a386f0fc3631c561091b"><td class="memTemplParams" colspan="2">template&lt;template&lt; typename... &gt; class Concept, typename T , typename U &gt; </td></tr>
<tr class="memitem:gae85b604ae6c7a386f0fc3631c561091b"><td class="memTemplItemLeft" align="right" valign="top">using&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__group-details.html#gae85b604ae6c7a386f0fc3631c561091b">boost::hana::detail::has_common_embedding</a> = typename has_common_embedding_impl&lt; Concept, T, U &gt;::<a class="el" href="structboost_1_1hana_1_1type.html">type</a></td></tr>
<tr class="memdesc:gae85b604ae6c7a386f0fc3631c561091b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns whether <code>T</code> and <code>U</code> both have an embedding into a common type.  <a href="group__group-details.html#gae85b604ae6c7a386f0fc3631c561091b">More...</a><br /></td></tr>
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<tr class="memitem:ga9acac3c4609cff5f0957572744c61ec4"><td class="memTemplParams" colspan="2">template&lt;template&lt; typename... &gt; class Concept, typename T , typename U &gt; </td></tr>
<tr class="memitem:ga9acac3c4609cff5f0957572744c61ec4"><td class="memTemplItemLeft" align="right" valign="top">using&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="group__group-details.html#ga9acac3c4609cff5f0957572744c61ec4">boost::hana::detail::has_nontrivial_common_embedding</a> = typename has_nontrivial_common_embedding_impl&lt; Concept, T, U &gt;::<a class="el" href="structboost_1_1hana_1_1type.html">type</a></td></tr>
<tr class="memdesc:ga9acac3c4609cff5f0957572744c61ec4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns whether <code>T</code> and <code>U</code> are distinct and both have an embedding into a common type.  <a href="group__group-details.html#ga9acac3c4609cff5f0957572744c61ec4">More...</a><br /></td></tr>
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<h2 class="groupheader">Macro Definition Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ga5de7a0132a80e37c73d544ece1e6dd4e">&#9670;&nbsp;</a></span>BOOST_HANA_DISPATCH_IF</h2>

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          <td class="memname">#define BOOST_HANA_DISPATCH_IF</td>
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<p><code>#include &lt;<a class="el" href="dispatch__if_8hpp.html">boost/hana/detail/dispatch_if.hpp</a>&gt;</code></p>

<p>Dispatch to the given implementation method only when a condition is satisfied. </p>
<p>If the condition is satisfied, this macro is equivalent to the type <code>IMPL</code>. Otherwise, it is equivalent to a type with a deleted static function named <code>apply</code>. When a tag-dispatching error happens, the condition should be false and the deleted static function <code>apply</code> will prevent the compiler from generating too much garbage.</p>
<dl class="section note"><dt>Note</dt><dd>When <code>BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS</code> is defined, the condition is always ignored and this macro expands to the implementation only.</dd></dl>
<dl class="section remark"><dt>Remarks</dt><dd>This must be implemented as a macro, because we don't want the condition to be evaluated at all when <code>BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS</code> is defined. </dd></dl>

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<h2 class="memtitle"><span class="permalink"><a href="#ga4bd17b3ef62e1e275dfe485923fdf666">&#9670;&nbsp;</a></span>BOOST_HANA_PP_DROP_FRONT</h2>

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          <td class="memname">#define BOOST_HANA_PP_DROP_FRONT</td>
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<p><code>#include &lt;<a class="el" href="preprocessor_8hpp.html">boost/hana/detail/preprocessor.hpp</a>&gt;</code></p>

<p>Expands to all of its arguments, except for the first one. </p>
<p>This macro may not be called with less than 2 arguments. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga62fe3327023c37706c827cc82624998b">&#9670;&nbsp;</a></span>BOOST_HANA_PP_NARG</h2>

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          <td class="memname">#define BOOST_HANA_PP_NARG</td>
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          <td>&#160;&#160;&#160;BOOST_HANA_PP_NARG_IMPL(__VA_ARGS__, 40,39,38,37,36,35,34,33,32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,)</td>
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<p><code>#include &lt;<a class="el" href="struct__macros_8hpp.html">boost/hana/detail/struct_macros.hpp</a>&gt;</code></p>

<p>Macro expanding to the number of arguments it is passed. </p>
<p>Specifically, <code><a class="el" href="group__group-details.html#ga62fe3327023c37706c827cc82624998b" title="Macro expanding to the number of arguments it is passed.">BOOST_HANA_PP_NARG(x1, ..., xn)</a></code> expands to <code>n</code>. It is an error to call this macro with 0 arguments. </p>

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<h2 class="groupheader">Typedef Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#gae85b604ae6c7a386f0fc3631c561091b">&#9670;&nbsp;</a></span>has_common_embedding</h2>

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template&lt;template&lt; typename... &gt; class Concept, typename T , typename U &gt; </div>
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          <td class="memname">using <a class="el" href="group__group-details.html#gae85b604ae6c7a386f0fc3631c561091b">boost::hana::detail::has_common_embedding</a> = typedef typename has_common_embedding_impl&lt;Concept, T, U&gt;::<a class="el" href="structboost_1_1hana_1_1type.html">type</a></td>
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<p><code>#include &lt;<a class="el" href="has__common__embedding_8hpp.html">boost/hana/detail/has_common_embedding.hpp</a>&gt;</code></p>

<p>Returns whether <code>T</code> and <code>U</code> both have an embedding into a common type. </p>
<p>If <code>T</code> and <code>U</code> do not have a common-type, this metafunction returns false. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga9acac3c4609cff5f0957572744c61ec4">&#9670;&nbsp;</a></span>has_nontrivial_common_embedding</h2>

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template&lt;template&lt; typename... &gt; class Concept, typename T , typename U &gt; </div>
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<p><code>#include &lt;<a class="el" href="has__common__embedding_8hpp.html">boost/hana/detail/has_common_embedding.hpp</a>&gt;</code></p>

<p>Returns whether <code>T</code> and <code>U</code> are distinct and both have an embedding into a common type. </p>
<p>If <code>T</code> and <code>U</code> do not have a common-type, this metafunction returns false. </p>

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