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<div class="title">std::experimental::fundamentals_v1::optional< _Tp > Class Template Reference<div class="ingroups"><a class="el" href="a01514.html">Experimental</a> » <a class="el" href="a01515.html">Optional values</a></div></div> </div>
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Inheritance diagram for std::experimental::fundamentals_v1::optional< _Tp >:</div>
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Public Types</h2></td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>value_type</b> = _Tp</td></tr>
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Public Member Functions</h2></td></tr>
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template<typename _Up = _Tp, enable_if_t< __and_< __not_< is_same< optional< _Tp >, decay_t< _Up >>>, is_constructible< _Tp, _Up && >, is_convertible< _Up &&, _Tp > >::value, bool > = true> </td></tr>
<tr class="memitem:a1b00d32a52f30992694ada8caca4a823"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><b>optional</b> (_Up &&__t)</td></tr>
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template<typename _Up = _Tp, enable_if_t< __and_< __not_< is_same< optional< _Tp >, decay_t< _Up >>>, is_constructible< _Tp, _Up && >, __not_< is_convertible< _Up &&, _Tp >> >::value, bool > = false> </td></tr>
<tr class="memitem:a1b00d32a52f30992694ada8caca4a823"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><b>optional</b> (_Up &&__t)</td></tr>
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template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, const _Up & >, is_convertible< const _Up &, _Tp >, __not_< __converts_from_optional< _Tp, _Up >> >::value, bool > = true> </td></tr>
<tr class="memitem:a1422c558f2a90617079f59dcc13f45bd"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><b>optional</b> (const <a class="el" href="a09988.html">optional</a>< _Up > &__t)</td></tr>
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template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, const _Up & >, __not_< is_convertible< const _Up &, _Tp >>, __not_< __converts_from_optional< _Tp, _Up >> >::value, bool > = false> </td></tr>
<tr class="memitem:a1422c558f2a90617079f59dcc13f45bd"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><b>optional</b> (const <a class="el" href="a09988.html">optional</a>< _Up > &__t)</td></tr>
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template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, _Up && >, is_convertible< _Up &&, _Tp >, __not_< __converts_from_optional< _Tp, _Up >> >::value, bool > = true> </td></tr>
<tr class="memitem:a87c6c66e8024cb875018dcf92e931a92"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><b>optional</b> (<a class="el" href="a09988.html">optional</a>< _Up > &&__t)</td></tr>
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template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, _Up && >, __not_< is_convertible< _Up &&, _Tp >>, __not_< __converts_from_optional< _Tp, _Up >> >::value, bool > = false> </td></tr>
<tr class="memitem:a87c6c66e8024cb875018dcf92e931a92"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><b>optional</b> (<a class="el" href="a09988.html">optional</a>< _Up > &&__t)</td></tr>
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template<typename... _Args> </td></tr>
<tr class="memitem:a32a6fa9d6e3935453b0bea719052a90c"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a01476.html#gaccc2a55dff256e901d69f67ef213d12c">enable_if_t</a>< <a class="el" href="a03572.html">is_constructible</a>< _Tp, _Args &&... >::value > </td><td class="memTemplItemRight" valign="bottom"><b>emplace</b> (_Args &&... __args)</td></tr>
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template<typename _Up , typename... _Args> </td></tr>
<tr class="memitem:a98001758510cbd45538ba02c3fbd4f74"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a01476.html#gaccc2a55dff256e901d69f67ef213d12c">enable_if_t</a>< <a class="el" href="a03572.html">is_constructible</a>< _Tp, <a class="el" href="a01652.html">initializer_list</a>< _Up > &, _Args &&... >::value > </td><td class="memTemplItemRight" valign="bottom"><b>emplace</b> (<a class="el" href="a01652.html">initializer_list</a>< _Up > __il, _Args &&... __args)</td></tr>
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constexpr </td><td class="memItemRight" valign="bottom"><b>operator bool</b> () const noexcept</td></tr>
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constexpr const _Tp & </td><td class="memItemRight" valign="bottom"><b>operator*</b> () const &</td></tr>
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constexpr _Tp & </td><td class="memItemRight" valign="bottom"><b>operator*</b> () &</td></tr>
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constexpr _Tp && </td><td class="memItemRight" valign="bottom"><b>operator*</b> () &&</td></tr>
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constexpr const _Tp && </td><td class="memItemRight" valign="bottom"><b>operator*</b> () const &&</td></tr>
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constexpr const _Tp * </td><td class="memItemRight" valign="bottom"><b>operator-></b> () const</td></tr>
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_Tp * </td><td class="memItemRight" valign="bottom"><b>operator-></b> ()</td></tr>
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<a class="el" href="a09988.html">optional</a> & </td><td class="memItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="a09996.html">nullopt_t</a>) noexcept</td></tr>
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template<typename _Up = _Tp> </td></tr>
<tr class="memitem:a6d51e63b6cddb2823b30ee626a8ced8d"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a01476.html#gaccc2a55dff256e901d69f67ef213d12c">enable_if_t</a>< __and_< __not_< <a class="el" href="a03880.html">is_same</a>< <a class="el" href="a09988.html">optional</a>< _Tp >, <a class="el" href="a01476.html#gabe26c12710bb4c683badfaf0a586c5be">decay_t</a>< _Up > > >, <a class="el" href="a03572.html">is_constructible</a>< _Tp, _Up >, __not_< __and_< <a class="el" href="a03416.html">is_scalar</a>< _Tp >, <a class="el" href="a03880.html">is_same</a>< _Tp, <a class="el" href="a01476.html#gabe26c12710bb4c683badfaf0a586c5be">decay_t</a>< _Up > > > >, <a class="el" href="a03680.html">is_assignable</a>< _Tp &, _Up > >::value, <a class="el" href="a09988.html">optional</a> & > </td><td class="memTemplItemRight" valign="bottom"><b>operator=</b> (_Up &&__u)</td></tr>
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template<typename _Up > </td></tr>
<tr class="memitem:a47118c8b80e699324c33370a1de84dba"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a01476.html#gaccc2a55dff256e901d69f67ef213d12c">enable_if_t</a>< __and_< __not_< <a class="el" href="a03880.html">is_same</a>< _Tp, _Up > >, <a class="el" href="a03572.html">is_constructible</a>< _Tp, const _Up & >, <a class="el" href="a03680.html">is_assignable</a>< _Tp &, _Up >, __not_< __converts_from_optional< _Tp, _Up > >, __not_< __assigns_from_optional< _Tp, _Up > > >::value, <a class="el" href="a09988.html">optional</a> & > </td><td class="memTemplItemRight" valign="bottom"><b>operator=</b> (const <a class="el" href="a09988.html">optional</a>< _Up > &__u)</td></tr>
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template<typename _Up > </td></tr>
<tr class="memitem:ae74bac4ef7c2b2c69b93c765900b669f"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="a01476.html#gaccc2a55dff256e901d69f67ef213d12c">enable_if_t</a>< __and_< __not_< <a class="el" href="a03880.html">is_same</a>< _Tp, _Up > >, <a class="el" href="a03572.html">is_constructible</a>< _Tp, _Up >, <a class="el" href="a03680.html">is_assignable</a>< _Tp &, _Up >, __not_< __converts_from_optional< _Tp, _Up > >, __not_< __assigns_from_optional< _Tp, _Up > > >::value, <a class="el" href="a09988.html">optional</a> & > </td><td class="memTemplItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="a09988.html">optional</a>< _Up > &&__u)</td></tr>
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void </td><td class="memItemRight" valign="bottom"><b>swap</b> (<a class="el" href="a09988.html">optional</a> &__other) noexcept(<a class="el" href="a03676.html">is_nothrow_move_constructible</a>< _Tp >() &&__is_nothrow_swappable< _Tp >::value)</td></tr>
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constexpr const _Tp & </td><td class="memItemRight" valign="bottom"><b>value</b> () const &</td></tr>
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constexpr _Tp & </td><td class="memItemRight" valign="bottom"><b>value</b> () &</td></tr>
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constexpr _Tp && </td><td class="memItemRight" valign="bottom"><b>value</b> () &&</td></tr>
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constexpr const _Tp && </td><td class="memItemRight" valign="bottom"><b>value</b> () const &&</td></tr>
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template<typename _Up > </td></tr>
<tr class="memitem:a24af000be1a559fcbce6c3ea99b196aa"><td class="memTemplItemLeft" align="right" valign="top">constexpr _Tp </td><td class="memTemplItemRight" valign="bottom"><b>value_or</b> (_Up &&__u) const &</td></tr>
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template<typename _Up > </td></tr>
<tr class="memitem:ac503d2b8a3e8582ed7a28e8d032f3bc5"><td class="memTemplItemLeft" align="right" valign="top">_Tp </td><td class="memTemplItemRight" valign="bottom"><b>value_or</b> (_Up &&__u) &&</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pri-methods"></a>
Private Member Functions</h2></td></tr>
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void </td><td class="memItemRight" valign="bottom"><b>_M_construct</b> (_Args &&... __args) noexcept(<a class="el" href="a03644.html">is_nothrow_constructible</a>< _Stored_type, _Args... >())</td></tr>
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void </td><td class="memItemRight" valign="bottom"><b>_M_destruct</b> ()</td></tr>
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constexpr _Tp & </td><td class="memItemRight" valign="bottom"><b>_M_get</b> () noexcept</td></tr>
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constexpr const _Tp & </td><td class="memItemRight" valign="bottom"><b>_M_get</b> () const noexcept</td></tr>
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constexpr bool </td><td class="memItemRight" valign="bottom"><b>_M_is_engaged</b> () const noexcept</td></tr>
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void </td><td class="memItemRight" valign="bottom"><b>_M_reset</b> ()</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pri-attribs"></a>
Private Attributes</h2></td></tr>
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_Empty_byte </td><td class="memItemRight" valign="bottom"><b>_M_empty</b></td></tr>
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_Stored_type </td><td class="memItemRight" valign="bottom"><b>_M_payload</b></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template<typename _Tp><br />
class std::experimental::fundamentals_v1::optional< _Tp ></h3>
<p>Class template for optional values. </p>
<p class="definition">Definition at line <a class="el" href="a01007_source.html#l00081">81</a> of file <a class="el" href="a01007_source.html">optional</a>.</p>
</div><hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="a01007_source.html">optional</a></li>
</ul>
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<li class="navelem"><a class="el" href="a01538.html">std</a></li><li class="navelem"><b>experimental</b></li><li class="navelem"><b>fundamentals_v1</b></li><li class="navelem"><a class="el" href="a09988.html">optional</a></li>
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