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- <a href="#related">Synopsis of associated functions</a> |
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- <div class="title">boost::hana::tuple< Xn > Struct Template Reference<div class="ingroups"><a class="el" href="group__group-datatypes.html">Data types</a></div></div> </div>
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- <a name="details" id="details"></a><h2 class="groupheader">Description</h2>
- <div class="textblock"><h3>template<typename ... Xn><br />
- struct boost::hana::tuple< Xn ></h3>
- <p>General purpose index-based heterogeneous sequence with a fixed length. </p>
- <p>The tuple is the bread and butter for static metaprogramming. Conceptually, it is like a <code><a class="el" href="structstd_1_1tuple.html" title="Adapter for std::tuples.">std::tuple</a></code>; it is a container able of holding objects of different types and whose size is fixed at compile-time. However, Hana's tuple provides much more functionality than its <code>std</code> counterpart, and it is also much more efficient than all standard library implementations tested so far.</p>
- <p>Tuples are index-based sequences. If you need an associative sequence with a key-based access, then you should consider <code><a class="el" href="structboost_1_1hana_1_1map.html" title="Basic associative container requiring unique, Comparable and Hashable keys.">hana::map</a></code> or <code><a class="el" href="structboost_1_1hana_1_1set.html" title="Basic unordered container requiring unique, Comparable and Hashable keys.">hana::set</a></code> instead.</p>
- <dl class="section note"><dt>Note</dt><dd>When you use a container, remember not to make assumptions about its representation, unless the documentation gives you those guarantees. More details <a class="el" href="index.html#tutorial-containers-types">in the tutorial</a>.</dd></dl>
- <h2>Modeled concepts </h2>
- <p><code>Sequence</code>, and all the concepts it refines</p>
- <h2>Provided operators </h2>
- <p>For convenience, the following operators are provided: </p><div class="fragment"><div class="line">xs == ys -> <a class="code" href="group__group-Comparable.html#gacaf1ebea6b3ab96ac9dcb82f0e64e547">equal</a>(xs, ys)</div><div class="line">xs != ys -> <a class="code" href="group__group-Comparable.html#gae33be2e0d5e04f19082f4b7740dfc9cd">not_equal</a>(xs, ys)</div><div class="line"></div><div class="line">xs < ys -> <a class="code" href="group__group-Orderable.html#gad510011602bdb14686f1c4ec145301c9">less</a>(xs, ys)</div><div class="line">xs <= ys -> <a class="code" href="group__group-Orderable.html#ga9917dd82beb67151bf5657245d37b851">less_equal</a>(xs, ys)</div><div class="line">xs > ys -> <a class="code" href="group__group-Orderable.html#gaf9a073eafebbe514fb19dff82318f198">greater</a>(xs, ys)</div><div class="line">xs >= ys -> <a class="code" href="group__group-Orderable.html#ga6023631e7d0a01e16dc3fa4221fbd703">greater_equal</a>(xs, ys)</div><div class="line"></div><div class="line">xs | f -> <a class="code" href="group__group-Monad.html#ga05fdc2f887cb9967357487a432ace98b">chain</a>(xs, f)</div><div class="line"></div><div class="line">xs[n] -> <a class="code" href="group__group-Iterable.html#ga8a484304380eae38f3d9663d98860129">at</a>(xs, n)</div></div><!-- fragment --><h2>Example </h2>
- <div class="fragment"><div class="line"><span class="comment">// Copyright Louis Dionne 2013-2017</span></div><div class="line"><span class="comment">// Distributed under the Boost Software License, Version 1.0.</span></div><div class="line"><span class="comment">// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <<a class="code" href="assert_8hpp.html">boost/hana/assert.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="equal_8hpp.html">boost/hana/equal.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="integral__constant_8hpp.html">boost/hana/integral_constant.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="transform_8hpp.html">boost/hana/transform.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="tuple_8hpp.html">boost/hana/tuple.hpp</a>></span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <string></span></div><div class="line"><span class="keyword">namespace </span>hana = <a class="code" href="namespaceboost_1_1hana.html">boost::hana</a>;</div><div class="line"><span class="keyword">using namespace </span>hana::literals;</div><div class="line"></div><div class="line"></div><div class="line"><span class="keyword">struct </span>Fish { std::string name; };</div><div class="line"><span class="keyword">struct </span>Cat { std::string name; };</div><div class="line"><span class="keyword">struct </span>Dog { std::string name; };</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() {</div><div class="line"> hana::tuple<Fish, Cat, Dog> animals{{<span class="stringliteral">"Nemo"</span>}, {<span class="stringliteral">"Garfield"</span>}, {<span class="stringliteral">"Snoopy"</span>}};</div><div class="line"> animals[0_c].name = <span class="stringliteral">"Moby Dick"</span>; <span class="comment">// can modify elements in place, like std::tuple</span></div><div class="line"></div><div class="line"> <span class="keyword">auto</span> names = <a class="code" href="group__group-Functor.html#ga5a8975f6e55375d5b6038a9c36ee63e7">hana::transform</a>(animals, [](<span class="keyword">auto</span> a) {</div><div class="line"> <span class="keywordflow">return</span> a.name;</div><div class="line"> });</div><div class="line"></div><div class="line"> <a class="code" href="group__group-assertions.html#ga4796ae107d58b67e0bbccd5ae6f70101">BOOST_HANA_RUNTIME_CHECK</a>(names == hana::make_tuple(<span class="stringliteral">"Moby Dick"</span>, <span class="stringliteral">"Garfield"</span>, <span class="stringliteral">"Snoopy"</span>));</div><div class="line">}</div></div><!-- fragment --> </div><div id="dynsection-0" onclick="return toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;">
- <img id="dynsection-0-trigger" src="closed.png" alt="+"/> Inheritance diagram for boost::hana::tuple< Xn >:</div>
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- <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="related"></a>
- Synopsis of associated functions</h2></td></tr>
- <tr class="memitem:ad9d8c7efa77e573eba2dfc48b3343e66"><td class="memTemplParams" colspan="2">template<> </td></tr>
- <tr class="memitem:ad9d8c7efa77e573eba2dfc48b3343e66"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#ad9d8c7efa77e573eba2dfc48b3343e66">make< tuple_tag ></a></td></tr>
- <tr class="memdesc:ad9d8c7efa77e573eba2dfc48b3343e66"><td class="mdescLeft"> </td><td class="mdescRight">Function object for creating a <code>tuple</code>. <a href="#ad9d8c7efa77e573eba2dfc48b3343e66">More...</a><br /></td></tr>
- <tr class="separator:ad9d8c7efa77e573eba2dfc48b3343e66"><td class="memSeparator" colspan="2"> </td></tr>
- <tr class="memitem:af3c175cfb83276339f91e867d738a2e6"><td class="memItemLeft" align="right" valign="top">constexpr auto </td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#af3c175cfb83276339f91e867d738a2e6">make_tuple</a> = <a class="el" href="group__group-core.html#ga1d92480f0af1029878e773dafa3e2f60">make</a><<a class="el" href="structboost_1_1hana_1_1tuple__tag.html">tuple_tag</a>></td></tr>
- <tr class="memdesc:af3c175cfb83276339f91e867d738a2e6"><td class="mdescLeft"> </td><td class="mdescRight">Alias to <code>make<<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>></code>; provided for convenience. <a href="#af3c175cfb83276339f91e867d738a2e6">More...</a><br /></td></tr>
- <tr class="separator:af3c175cfb83276339f91e867d738a2e6"><td class="memSeparator" colspan="2"> </td></tr>
- <tr class="memitem:a749b564c8f115957837761d75191beac"><td class="memItemLeft" align="right" valign="top">constexpr auto </td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a749b564c8f115957837761d75191beac">to_tuple</a> = <a class="el" href="group__group-core.html#gadc70755c1d059139297814fb3bfeb91e">to</a><<a class="el" href="structboost_1_1hana_1_1tuple__tag.html">tuple_tag</a>></td></tr>
- <tr class="memdesc:a749b564c8f115957837761d75191beac"><td class="mdescLeft"> </td><td class="mdescRight">Equivalent to <code>to<<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>></code>; provided for convenience. <a href="#a749b564c8f115957837761d75191beac">More...</a><br /></td></tr>
- <tr class="separator:a749b564c8f115957837761d75191beac"><td class="memSeparator" colspan="2"> </td></tr>
- <tr class="memitem:a1997546daf58a48cc15498d338a03da3"><td class="memTemplParams" colspan="2">template<typename ... T> </td></tr>
- <tr class="memitem:a1997546daf58a48cc15498d338a03da3"><td class="memTemplItemLeft" align="right" valign="top">constexpr implementation_defined </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a1997546daf58a48cc15498d338a03da3">tuple_t</a> {}</td></tr>
- <tr class="memdesc:a1997546daf58a48cc15498d338a03da3"><td class="mdescLeft"> </td><td class="mdescRight">Create a tuple specialized for holding <code><a class="el" href="structboost_1_1hana_1_1type.html" title="C++ type in value-level representation.">hana::type</a></code>s. <a href="#a1997546daf58a48cc15498d338a03da3">More...</a><br /></td></tr>
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- <tr class="memitem:a85c2f16caa2a1e12eefd1b3f69fa658e"><td class="memTemplParams" colspan="2">template<typename T , T ... v> </td></tr>
- <tr class="memitem:a85c2f16caa2a1e12eefd1b3f69fa658e"><td class="memTemplItemLeft" align="right" valign="top">constexpr implementation_defined </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a85c2f16caa2a1e12eefd1b3f69fa658e">tuple_c</a> {}</td></tr>
- <tr class="memdesc:a85c2f16caa2a1e12eefd1b3f69fa658e"><td class="mdescLeft"> </td><td class="mdescRight">Create a tuple specialized for holding <code><a class="el" href="structboost_1_1hana_1_1integral__constant.html" title="Compile-time value of an integral type.">hana::integral_constant</a></code>s. <a href="#a85c2f16caa2a1e12eefd1b3f69fa658e">More...</a><br /></td></tr>
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- Friends</h2></td></tr>
- <tr class="memitem:a59b4d21f17e2caed8c31d8389d0f0878"><td class="memTemplParams" colspan="2"><a id="a59b4d21f17e2caed8c31d8389d0f0878"></a>
- template<typename ... T, typename F > </td></tr>
- <tr class="memitem:a59b4d21f17e2caed8c31d8389d0f0878"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a59b4d21f17e2caed8c31d8389d0f0878">operator|</a> (<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a>< T... >, F)</td></tr>
- <tr class="memdesc:a59b4d21f17e2caed8c31d8389d0f0878"><td class="mdescLeft"> </td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Monad.html#ga05fdc2f887cb9967357487a432ace98b" title="Feed a monadic value into a monadic computation.Given a monadic value and a monadic function,...">hana::chain</a></code>. <br /></td></tr>
- <tr class="separator:a59b4d21f17e2caed8c31d8389d0f0878"><td class="memSeparator" colspan="2"> </td></tr>
- <tr class="memitem:a27607958295e6da8a0ba602a2db468f1"><td class="memTemplParams" colspan="2"><a id="a27607958295e6da8a0ba602a2db468f1"></a>
- template<typename X , typename Y > </td></tr>
- <tr class="memitem:a27607958295e6da8a0ba602a2db468f1"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a27607958295e6da8a0ba602a2db468f1">operator==</a> (X &&x, Y &&y)</td></tr>
- <tr class="memdesc:a27607958295e6da8a0ba602a2db468f1"><td class="mdescLeft"> </td><td class="mdescRight">Equivalent to <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> <br /></td></tr>
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- <tr class="memitem:a0cae3af55edb3eb05bfa184bda633f7d"><td class="memTemplParams" colspan="2"><a id="a0cae3af55edb3eb05bfa184bda633f7d"></a>
- template<typename X , typename Y > </td></tr>
- <tr class="memitem:a0cae3af55edb3eb05bfa184bda633f7d"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a0cae3af55edb3eb05bfa184bda633f7d">operator!=</a> (X &&x, Y &&y)</td></tr>
- <tr class="memdesc:a0cae3af55edb3eb05bfa184bda633f7d"><td class="mdescLeft"> </td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Comparable.html#gae33be2e0d5e04f19082f4b7740dfc9cd" title="Returns a Logical representing whether x is not equal to y.The not_equal function can be called in tw...">hana::not_equal</a></code> <br /></td></tr>
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- <tr class="memitem:ada078dcf9e68b8e9a82b33c75dde8457"><td class="memTemplParams" colspan="2"><a id="ada078dcf9e68b8e9a82b33c75dde8457"></a>
- template<typename X , typename Y > </td></tr>
- <tr class="memitem:ada078dcf9e68b8e9a82b33c75dde8457"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#ada078dcf9e68b8e9a82b33c75dde8457">operator<</a> (X &&x, Y &&y)</td></tr>
- <tr class="memdesc:ada078dcf9e68b8e9a82b33c75dde8457"><td class="mdescLeft"> </td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Orderable.html#gad510011602bdb14686f1c4ec145301c9" title="Returns a Logical representing whether x is less than y.">hana::less</a></code> <br /></td></tr>
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- template<typename X , typename Y > </td></tr>
- <tr class="memitem:aedd11fddefddbbbb87d3b24c7117528f"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#aedd11fddefddbbbb87d3b24c7117528f">operator></a> (X &&x, Y &&y)</td></tr>
- <tr class="memdesc:aedd11fddefddbbbb87d3b24c7117528f"><td class="mdescLeft"> </td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Orderable.html#gaf9a073eafebbe514fb19dff82318f198" title="Returns a Logical representing whether x is greater than y.">hana::greater</a></code> <br /></td></tr>
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- template<typename X , typename Y > </td></tr>
- <tr class="memitem:a53817979990da799e659b2576799a79a"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a53817979990da799e659b2576799a79a">operator<=</a> (X &&x, Y &&y)</td></tr>
- <tr class="memdesc:a53817979990da799e659b2576799a79a"><td class="mdescLeft"> </td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Orderable.html#ga9917dd82beb67151bf5657245d37b851" title="Returns a Logical representing whether x is less than or equal to y.">hana::less_equal</a></code> <br /></td></tr>
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- template<typename X , typename Y > </td></tr>
- <tr class="memitem:aa3f0436b623de5208767751e1e9f7e59"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#aa3f0436b623de5208767751e1e9f7e59">operator>=</a> (X &&x, Y &&y)</td></tr>
- <tr class="memdesc:aa3f0436b623de5208767751e1e9f7e59"><td class="mdescLeft"> </td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Orderable.html#ga6023631e7d0a01e16dc3fa4221fbd703" title="Returns a Logical representing whether x is greater than or equal to y.">hana::greater_equal</a></code> <br /></td></tr>
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- <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
- Public Member Functions</h2></td></tr>
- <tr class="memitem:a8e10223983bfb3873c285be85f7ab273"><td class="memItemLeft" align="right" valign="top"><a id="a8e10223983bfb3873c285be85f7ab273"></a>
- constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a8e10223983bfb3873c285be85f7ab273">tuple</a> ()</td></tr>
- <tr class="memdesc:a8e10223983bfb3873c285be85f7ab273"><td class="mdescLeft"> </td><td class="mdescRight">Default constructs the <code>tuple</code>. Only exists when all the elements of the tuple are default constructible. <br /></td></tr>
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- <tr class="memitem:a4e4e6193df38146b1eab93bcf963fc81"><td class="memItemLeft" align="right" valign="top">constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a4e4e6193df38146b1eab93bcf963fc81">tuple</a> (Xn const &...xn)</td></tr>
- <tr class="memdesc:a4e4e6193df38146b1eab93bcf963fc81"><td class="mdescLeft"> </td><td class="mdescRight">Initialize each element of the tuple with the corresponding element from <code>xn...</code>. Only exists when all the elements of the tuple are copy-constructible. <a href="#a4e4e6193df38146b1eab93bcf963fc81">More...</a><br /></td></tr>
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- <tr class="memitem:a9a5dd3930d94a900190de98247e0c415"><td class="memTemplParams" colspan="2">template<typename ... Yn> </td></tr>
- <tr class="memitem:a9a5dd3930d94a900190de98247e0c415"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a9a5dd3930d94a900190de98247e0c415">tuple</a> (Yn &&...yn)</td></tr>
- <tr class="memdesc:a9a5dd3930d94a900190de98247e0c415"><td class="mdescLeft"> </td><td class="mdescRight">Initialize each element of the tuple by perfect-forwarding the corresponding element in <code>yn...</code>. Only exists when all the elements of the created tuple are constructible from the corresponding perfect-forwarded value. <a href="#a9a5dd3930d94a900190de98247e0c415">More...</a><br /></td></tr>
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- template<typename ... Yn> </td></tr>
- <tr class="memitem:a6cf99e86ab1506594eca03881748fe91"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#a6cf99e86ab1506594eca03881748fe91">tuple</a> (<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a>< Yn... > const &other)</td></tr>
- <tr class="memdesc:a6cf99e86ab1506594eca03881748fe91"><td class="mdescLeft"> </td><td class="mdescRight">Copy-initialize a tuple from another tuple. Only exists when all the elements of the constructed tuple are copy-constructible from the corresponding element in the source tuple. <br /></td></tr>
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- template<typename ... Yn> </td></tr>
- <tr class="memitem:ac504757198d85ab9de1258de634e3b71"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#ac504757198d85ab9de1258de634e3b71">tuple</a> (<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a>< Yn... > &&other)</td></tr>
- <tr class="memdesc:ac504757198d85ab9de1258de634e3b71"><td class="mdescLeft"> </td><td class="mdescRight">Move-initialize a tuple from another tuple. Only exists when all the elements of the constructed tuple are move-constructible from the corresponding element in the source tuple. <br /></td></tr>
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- template<typename ... Yn> </td></tr>
- <tr class="memitem:acddfa6d631c249ae667d52dd63c0aeaf"><td class="memTemplItemLeft" align="right" valign="top">constexpr <a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a> & </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#acddfa6d631c249ae667d52dd63c0aeaf">operator=</a> (<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a>< Yn... > const &other)</td></tr>
- <tr class="memdesc:acddfa6d631c249ae667d52dd63c0aeaf"><td class="mdescLeft"> </td><td class="mdescRight">Assign a tuple to another tuple. Only exists when all the elements of the destination tuple are assignable from the corresponding element in the source tuple. <br /></td></tr>
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- template<typename ... Yn> </td></tr>
- <tr class="memitem:ad3f0fe520974a22cc12a978f4b061caa"><td class="memTemplItemLeft" align="right" valign="top">constexpr <a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a> & </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#ad3f0fe520974a22cc12a978f4b061caa">operator=</a> (<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a>< Yn... > &&other)</td></tr>
- <tr class="memdesc:ad3f0fe520974a22cc12a978f4b061caa"><td class="mdescLeft"> </td><td class="mdescRight">Move-assign a tuple to another tuple. Only exists when all the elements of the destination tuple are move-assignable from the corresponding element in the source tuple. <br /></td></tr>
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- template<typename N > </td></tr>
- <tr class="memitem:acef38216a6c6da0296a5f7b5241e951b"><td class="memTemplItemLeft" align="right" valign="top">decltype(auto) constexpr </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1tuple.html#acef38216a6c6da0296a5f7b5241e951b">operator[]</a> (N &&n)</td></tr>
- <tr class="memdesc:acef38216a6c6da0296a5f7b5241e951b"><td class="mdescLeft"> </td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-Iterable.html#ga8a484304380eae38f3d9663d98860129" title="Returns the nth element of an iterable.Given an Iterable and an IntegralConstant index,...">hana::at</a></code> <br /></td></tr>
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- <h2 class="groupheader">Associated functions</h2>
- <a id="ad9d8c7efa77e573eba2dfc48b3343e66"></a>
- <h2 class="memtitle"><span class="permalink"><a href="#ad9d8c7efa77e573eba2dfc48b3343e66">◆ </a></span>make< tuple_tag ></h2>
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- template<typename ... Xn> </div>
- <div class="memtemplate">
- template<> </div>
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- <td class="memname">constexpr auto <a class="el" href="group__group-core.html#ga1d92480f0af1029878e773dafa3e2f60">make</a>< <a class="el" href="structboost_1_1hana_1_1tuple__tag.html">tuple_tag</a> ></td>
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- <span class="mlabels"><span class="mlabel">related</span></span> </td>
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- </div><div class="memdoc">
- <b>Initial value:</b><div class="fragment"><div class="line">= [](<span class="keyword">auto</span>&& ...xs) {</div><div class="line"> <span class="keywordflow">return</span> <a class="code" href="structboost_1_1hana_1_1tuple.html#a8e10223983bfb3873c285be85f7ab273">tuple</a><std::decay_t<decltype(xs)>...>{forwarded(xs)...};</div><div class="line"> }</div></div><!-- fragment -->
- <p>Function object for creating a <code>tuple</code>. </p>
- <p>Given zero or more objects <code>xs...</code>, <code>make<<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>></code> returns a new tuple containing those objects. The elements are held by value inside the resulting tuple, and they are hence copied or moved in. This is analogous to <code>std::make_tuple</code> for creating Hana tuples.</p>
- <h2>Example </h2>
- <div class="fragment"><div class="line"><span class="comment">// Copyright Louis Dionne 2013-2017</span></div><div class="line"><span class="comment">// Distributed under the Boost Software License, Version 1.0.</span></div><div class="line"><span class="comment">// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <<a class="code" href="assert_8hpp.html">boost/hana/assert.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="core_2make_8hpp.html">boost/hana/core/make.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="equal_8hpp.html">boost/hana/equal.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="tuple_8hpp.html">boost/hana/tuple.hpp</a>></span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <string></span></div><div class="line"><span class="keyword">namespace </span>hana = <a class="code" href="namespaceboost_1_1hana.html">boost::hana</a>;</div><div class="line"></div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() {</div><div class="line"> <span class="keyword">auto</span> xs = hana::make<hana::tuple_tag>(1, 2, <span class="charliteral">'3'</span>, std::string{<span class="stringliteral">"456"</span>});</div><div class="line"></div><div class="line"> constexpr <span class="keyword">auto</span> ys = hana::make<hana::tuple_tag>(1, <span class="charliteral">'2'</span>, 3.456);</div><div class="line"> static_assert(ys == hana::make_tuple(1, <span class="charliteral">'2'</span>, 3.456), <span class="stringliteral">""</span>);</div><div class="line">}</div></div><!-- fragment -->
- </div>
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- <h2 class="memtitle"><span class="permalink"><a href="#af3c175cfb83276339f91e867d738a2e6">◆ </a></span>make_tuple</h2>
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- template<typename ... Xn> </div>
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- <td class="memname">constexpr auto make_tuple = <a class="el" href="group__group-core.html#ga1d92480f0af1029878e773dafa3e2f60">make</a><<a class="el" href="structboost_1_1hana_1_1tuple__tag.html">tuple_tag</a>></td>
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- <p>Alias to <code>make<<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>></code>; provided for convenience. </p>
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- </div>
- <a id="a749b564c8f115957837761d75191beac"></a>
- <h2 class="memtitle"><span class="permalink"><a href="#a749b564c8f115957837761d75191beac">◆ </a></span>to_tuple</h2>
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- template<typename ... Xn> </div>
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- <td class="memname">constexpr auto to_tuple = <a class="el" href="group__group-core.html#gadc70755c1d059139297814fb3bfeb91e">to</a><<a class="el" href="structboost_1_1hana_1_1tuple__tag.html">tuple_tag</a>></td>
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- <span class="mlabels"><span class="mlabel">related</span></span> </td>
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- <p>Equivalent to <code>to<<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>></code>; provided for convenience. </p>
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- <a id="a1997546daf58a48cc15498d338a03da3"></a>
- <h2 class="memtitle"><span class="permalink"><a href="#a1997546daf58a48cc15498d338a03da3">◆ </a></span>tuple_t</h2>
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- template<typename ... Xn> </div>
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- <p>Create a tuple specialized for holding <code><a class="el" href="structboost_1_1hana_1_1type.html" title="C++ type in value-level representation.">hana::type</a></code>s. </p>
- <p>This is functionally equivalent to <code>make<<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>>(type_c<T>...)</code>, except that using <code>tuple_t</code> allows the library to perform some compile-time optimizations. Also note that the type of the objects returned by <code>tuple_t</code> and an equivalent call to <code>make<<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>></code> may differ.</p>
- <h2>Example </h2>
- <div class="fragment"><div class="line"><span class="comment">// Copyright Louis Dionne 2013-2017</span></div><div class="line"><span class="comment">// Distributed under the Boost Software License, Version 1.0.</span></div><div class="line"><span class="comment">// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <<a class="code" href="assert_8hpp.html">boost/hana/assert.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="core_2to_8hpp.html">boost/hana/core/to.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="equal_8hpp.html">boost/hana/equal.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="tuple_8hpp.html">boost/hana/tuple.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="type_8hpp.html">boost/hana/type.hpp</a>></span></div><div class="line"><span class="keyword">namespace </span>hana = <a class="code" href="namespaceboost_1_1hana.html">boost::hana</a>;</div><div class="line"></div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() {</div><div class="line"> <a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(</div><div class="line"> hana::to_tuple(hana::tuple_t<<span class="keywordtype">int</span>, <span class="keywordtype">char</span>, <span class="keywordtype">void</span>, <span class="keywordtype">int</span>(<span class="keywordtype">float</span>)>)</div><div class="line"> ==</div><div class="line"> hana::make_tuple(hana::type_c<int>, hana::type_c<char>, hana::type_c<void>, hana::type_c<<span class="keywordtype">int</span>(<span class="keywordtype">float</span>)>)</div><div class="line"> );</div><div class="line">}</div></div><!-- fragment -->
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- template<typename ... Xn> </div>
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- template<typename T , T ... v> </div>
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- <span class="mlabels"><span class="mlabel">related</span></span> </td>
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- </div><div class="memdoc">
- <p>Create a tuple specialized for holding <code><a class="el" href="structboost_1_1hana_1_1integral__constant.html" title="Compile-time value of an integral type.">hana::integral_constant</a></code>s. </p>
- <p>This is functionally equivalent to <code>make<<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>>(integral_c<T, v>...)</code>, except that using <code>tuple_c</code> allows the library to perform some compile-time optimizations. Also note that the type of the objects returned by <code>tuple_c</code> and an equivalent call to <code>make<<a class="el" href="structboost_1_1hana_1_1tuple__tag.html" title="Tag representing hana::tuples.">tuple_tag</a>></code> may differ.</p>
- <h2>Example </h2>
- <div class="fragment"><div class="line"><span class="comment">// Copyright Louis Dionne 2013-2017</span></div><div class="line"><span class="comment">// Distributed under the Boost Software License, Version 1.0.</span></div><div class="line"><span class="comment">// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <<a class="code" href="assert_8hpp.html">boost/hana/assert.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="core_2to_8hpp.html">boost/hana/core/to.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="equal_8hpp.html">boost/hana/equal.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="front_8hpp.html">boost/hana/front.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="integral__constant_8hpp.html">boost/hana/integral_constant.hpp</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="code" href="tuple_8hpp.html">boost/hana/tuple.hpp</a>></span></div><div class="line"><span class="keyword">namespace </span>hana = <a class="code" href="namespaceboost_1_1hana.html">boost::hana</a>;</div><div class="line"></div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() {</div><div class="line"> <a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(</div><div class="line"> hana::tuple_c<int, 0, 1, 2></div><div class="line"> ==</div><div class="line"> hana::make_tuple(hana::int_c<0>, hana::int_c<1>, hana::int_c<2>)</div><div class="line"> );</div><div class="line"></div><div class="line"> <a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(<a class="code" href="group__group-Iterable.html#ga8a67ea10e8082dbe6705e573fa978444">hana::front</a>(hana::tuple_c<int, 0, 1, 2>) == hana::int_c<0>);</div><div class="line">}</div></div><!-- fragment -->
- </div>
- </div>
- <h2 class="groupheader">Constructor & Destructor Documentation</h2>
- <a id="a4e4e6193df38146b1eab93bcf963fc81"></a>
- <h2 class="memtitle"><span class="permalink"><a href="#a4e4e6193df38146b1eab93bcf963fc81">◆ </a></span>tuple() <span class="overload">[1/2]</span></h2>
- <div class="memitem">
- <div class="memproto">
- <div class="memtemplate">
- template<typename ... Xn> </div>
- <table class="memname">
- <tr>
- <td class="memname">constexpr <a class="el" href="structboost_1_1hana_1_1tuple.html">boost::hana::tuple</a>< Xn >::<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a> </td>
- <td>(</td>
- <td class="paramtype">Xn const &... </td>
- <td class="paramname"><em>xn</em></td><td>)</td>
- <td></td>
- </tr>
- </table>
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- <p>Initialize each element of the tuple with the corresponding element from <code>xn...</code>. Only exists when all the elements of the tuple are copy-constructible. </p>
- <dl class="section note"><dt>Note</dt><dd>Unlike the corresponding constructor for <code><a class="el" href="structstd_1_1tuple.html" title="Adapter for std::tuples.">std::tuple</a></code>, this constructor is not explicit. This allows returning a tuple from a function with the brace-initialization syntax. </dd></dl>
- </div>
- </div>
- <a id="a9a5dd3930d94a900190de98247e0c415"></a>
- <h2 class="memtitle"><span class="permalink"><a href="#a9a5dd3930d94a900190de98247e0c415">◆ </a></span>tuple() <span class="overload">[2/2]</span></h2>
- <div class="memitem">
- <div class="memproto">
- <div class="memtemplate">
- template<typename ... Xn> </div>
- <div class="memtemplate">
- template<typename ... Yn> </div>
- <table class="memname">
- <tr>
- <td class="memname">constexpr <a class="el" href="structboost_1_1hana_1_1tuple.html">boost::hana::tuple</a>< Xn >::<a class="el" href="structboost_1_1hana_1_1tuple.html">tuple</a> </td>
- <td>(</td>
- <td class="paramtype">Yn &&... </td>
- <td class="paramname"><em>yn</em></td><td>)</td>
- <td></td>
- </tr>
- </table>
- </div><div class="memdoc">
- <p>Initialize each element of the tuple by perfect-forwarding the corresponding element in <code>yn...</code>. Only exists when all the elements of the created tuple are constructible from the corresponding perfect-forwarded value. </p>
- <dl class="section note"><dt>Note</dt><dd>Unlike the corresponding constructor for <code><a class="el" href="structstd_1_1tuple.html" title="Adapter for std::tuples.">std::tuple</a></code>, this constructor is not explicit. This allows returning a tuple from a function with the brace-initialization syntax. </dd></dl>
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