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<div class="headertitle"><div class="title">ranges::optional< T > Struct Template Reference</div></div>
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<img id="dynsection-0-trigger" src="closed.png" alt="+"/> Inheritance diagram for ranges::optional< T >:</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> = <a class="el" href="group__invocation.html#ga08e2193149605769f6052795ff0a87b1">meta::_t</a>< std::remove_cv< T > ></td></tr>
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<tr class="separator:aeda0f8cabc44f6bc3135b052905f65f8"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pub-methods" name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:ad8e95c49b8fc44a97e747b5de58aa205"><td class="memTemplParams" colspan="2"><a id="ad8e95c49b8fc44a97e747b5de58aa205" name="ad8e95c49b8fc44a97e747b5de58aa205"></a>
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template<typename... Args> <br />
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requires constructible_from<T, Args...></td></tr>
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<tr class="memitem:ad8e95c49b8fc44a97e747b5de58aa205"><td class="memTemplItemLeft" align="right" valign="top">T & </td><td class="memTemplItemRight" valign="bottom"><b>emplace</b> (Args &&... args) noexcept(std::is_nothrow_constructible< T, Args... >::value)</td></tr>
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<tr class="separator:ad8e95c49b8fc44a97e747b5de58aa205"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6fb88d6a0409d2229833ff87f4c32814"><td class="memTemplParams" colspan="2"><a id="a6fb88d6a0409d2229833ff87f4c32814" name="a6fb88d6a0409d2229833ff87f4c32814"></a>
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template<typename E , typename... Args> <br />
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requires constructible_from<T, std::initializer_list<E> &, Args...></td></tr>
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<tr class="memitem:a6fb88d6a0409d2229833ff87f4c32814"><td class="memTemplItemLeft" align="right" valign="top">T & </td><td class="memTemplItemRight" valign="bottom"><b>emplace</b> (std::initializer_list< E > il, Args &&... args) noexcept(std::is_nothrow_constructible< T, std::initializer_list< E > &, Args... >::value)</td></tr>
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<tr class="separator:a6fb88d6a0409d2229833ff87f4c32814"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a8348ed0af689f9e154765d9db032170b"><td class="memTemplParams" colspan="2"><a id="a8348ed0af689f9e154765d9db032170b" name="a8348ed0af689f9e154765d9db032170b"></a>
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template<typename I > <br />
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requires constructible_from<T, decltype(*std::declval<const I &>())></td></tr>
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<tr class="memitem:a8348ed0af689f9e154765d9db032170b"><td class="memTemplItemLeft" align="right" valign="top">T & </td><td class="memTemplItemRight" valign="bottom"><b>emplace_deref</b> (const I &it)</td></tr>
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<tr class="memitem:a7ede29c7f8c2232d733052da26bae9a3"><td class="memItemLeft" align="right" valign="top"><a id="a7ede29c7f8c2232d733052da26bae9a3" name="a7ede29c7f8c2232d733052da26bae9a3"></a>
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constexpr </td><td class="memItemRight" valign="bottom"><b>operator bool</b> () const noexcept</td></tr>
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<tr class="memitem:a5e660579eb02aacb893d6d43016a6d13"><td class="memItemLeft" align="right" valign="top"><a id="a5e660579eb02aacb893d6d43016a6d13" name="a5e660579eb02aacb893d6d43016a6d13"></a>
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constexpr <a class="el" href="structranges_1_1optional.html">optional</a> & </td><td class="memItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="structranges_1_1nullopt__t.html">nullopt_t</a>) noexcept</td></tr>
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<tr class="separator:a5e660579eb02aacb893d6d43016a6d13"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ac0438ab907d355b3929aa79f7883daf5"><td class="memItemLeft" align="right" valign="top"><a id="ac0438ab907d355b3929aa79f7883daf5" name="ac0438ab907d355b3929aa79f7883daf5"></a>
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<a class="el" href="structranges_1_1optional.html">optional</a> & </td><td class="memItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="structranges_1_1optional.html">optional</a> &&)=default</td></tr>
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<tr class="separator:ac0438ab907d355b3929aa79f7883daf5"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a650b55218118ec9de26a059626833401"><td class="memItemLeft" align="right" valign="top"><a id="a650b55218118ec9de26a059626833401" name="a650b55218118ec9de26a059626833401"></a>
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<a class="el" href="structranges_1_1optional.html">optional</a> & </td><td class="memItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="structranges_1_1optional.html">optional</a> const &)=default</td></tr>
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<tr class="separator:a650b55218118ec9de26a059626833401"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a58bbaf1eff62570093d1beee90210489"><td class="memTemplParams" colspan="2"><a id="a58bbaf1eff62570093d1beee90210489" name="a58bbaf1eff62570093d1beee90210489"></a>
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template<typename U > <br />
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requires optional_should_convert_assign<U, T> && constructible_from<T, U> && assignable_from<T &, U></td></tr>
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<tr class="memitem:a58bbaf1eff62570093d1beee90210489"><td class="memTemplItemLeft" align="right" valign="top">constexpr <a class="el" href="structranges_1_1optional.html">optional</a> & </td><td class="memTemplItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="structranges_1_1optional.html">optional</a>< U > &&that)</td></tr>
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<tr class="separator:a58bbaf1eff62570093d1beee90210489"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a2c84b29fb91c642879ec144a3cdb59bf"><td class="memTemplParams" colspan="2"><a id="a2c84b29fb91c642879ec144a3cdb59bf" name="a2c84b29fb91c642879ec144a3cdb59bf"></a>
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template<typename U > <br />
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requires optional_should_convert_assign<U, T> && constructible_from<T, const U &> && assignable_from<T &, const U &></td></tr>
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<tr class="memitem:a2c84b29fb91c642879ec144a3cdb59bf"><td class="memTemplItemLeft" align="right" valign="top">constexpr <a class="el" href="structranges_1_1optional.html">optional</a> & </td><td class="memTemplItemRight" valign="bottom"><b>operator=</b> (<a class="el" href="structranges_1_1optional.html">optional</a>< U > const &that)</td></tr>
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<tr class="separator:a2c84b29fb91c642879ec144a3cdb59bf"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a7523ff68c7389c216ae4233749ebf94d"><td class="memTemplParams" colspan="2"><a id="a7523ff68c7389c216ae4233749ebf94d" name="a7523ff68c7389c216ae4233749ebf94d"></a>
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template<typename U = T> <br />
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requires (!same_as<<a class="el" href="structranges_1_1optional.html">optional</a>, detail::decay_t<U>>) && (!(satisfies<T, std::is_scalar> && same_as<T, detail::decay_t<U>>)) && constructible_from<T, U> && assignable_from<T &, U></td></tr>
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<tr class="memitem:a7523ff68c7389c216ae4233749ebf94d"><td class="memTemplItemLeft" align="right" valign="top">constexpr <a class="el" href="structranges_1_1optional.html">optional</a> & </td><td class="memTemplItemRight" valign="bottom"><b>operator=</b> (U &&u) noexcept(std::is_nothrow_constructible< T, U >::value &&std::is_nothrow_assignable< T &, U >::value)</td></tr>
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<tr class="separator:a7523ff68c7389c216ae4233749ebf94d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a0b39976e2665f9cbf8e0def22a0ad157"><td class="memTemplParams" colspan="2"><a id="a0b39976e2665f9cbf8e0def22a0ad157" name="a0b39976e2665f9cbf8e0def22a0ad157"></a>
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template<typename E , typename... Args> <br />
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requires constructible_from<T, std::initializer_list<E> &, Args...></td></tr>
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<tr class="memitem:a0b39976e2665f9cbf8e0def22a0ad157"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><b>optional</b> (<a class="el" href="structranges_1_1in__place__t.html">in_place_t</a>, std::initializer_list< E > il, Args &&... args) noexcept(std::is_nothrow_constructible< T, std::initializer_list< E > &, Args... >::value)</td></tr>
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<tr class="separator:a0b39976e2665f9cbf8e0def22a0ad157"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a78a32128ef557ddd769b6e4f84bc2002"><td class="memItemLeft" align="right" valign="top"><a id="a78a32128ef557ddd769b6e4f84bc2002" name="a78a32128ef557ddd769b6e4f84bc2002"></a>
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constexpr </td><td class="memItemRight" valign="bottom"><b>optional</b> (<a class="el" href="structranges_1_1nullopt__t.html">nullopt_t</a>) noexcept</td></tr>
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<tr class="memitem:a1f1b588e9371fe7a9fca93d064152e84"><td class="memItemLeft" align="right" valign="top"><a id="a1f1b588e9371fe7a9fca93d064152e84" name="a1f1b588e9371fe7a9fca93d064152e84"></a>
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 </td><td class="memItemRight" valign="bottom"><b>optional</b> (<a class="el" href="structranges_1_1optional.html">optional</a> &&)=default</td></tr>
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<tr class="separator:a1f1b588e9371fe7a9fca93d064152e84"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a50bd4938a812b0acf95a506d4501d358"><td class="memItemLeft" align="right" valign="top"><a id="a50bd4938a812b0acf95a506d4501d358" name="a50bd4938a812b0acf95a506d4501d358"></a>
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 </td><td class="memItemRight" valign="bottom"><b>optional</b> (<a class="el" href="structranges_1_1optional.html">optional</a> const &)=default</td></tr>
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<tr class="separator:a50bd4938a812b0acf95a506d4501d358"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a352453036acf3df793340a8393438253"><td class="memTemplParams" colspan="2"><a id="a352453036acf3df793340a8393438253" name="a352453036acf3df793340a8393438253"></a>
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template<typename U > <br />
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requires optional_should_convert<U, T> && constructible_from<T, U> && convertible_to<U, T></td></tr>
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<tr class="memitem:a352453036acf3df793340a8393438253"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><b>optional</b> (<a class="el" href="structranges_1_1optional.html">optional</a>< U > &&that)</td></tr>
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<tr class="memitem:a988f4c1a100c1733a83f0688119e9f77"><td class="memTemplParams" colspan="2"><a id="a988f4c1a100c1733a83f0688119e9f77" name="a988f4c1a100c1733a83f0688119e9f77"></a>
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template<typename U > <br />
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requires optional_should_convert<U, T> && constructible_from<T, U> && (!convertible_to<U, T>)</td></tr>
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<tr class="memitem:a988f4c1a100c1733a83f0688119e9f77"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><b>optional</b> (<a class="el" href="structranges_1_1optional.html">optional</a>< U > &&that)</td></tr>
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<tr class="memitem:af18f21543611269bef836d0333ba640f"><td class="memTemplParams" colspan="2"><a id="af18f21543611269bef836d0333ba640f" name="af18f21543611269bef836d0333ba640f"></a>
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template<typename U > <br />
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requires optional_should_convert<U, T> && constructible_from<T, U const &> && convertible_to<U const &, T></td></tr>
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<tr class="memitem:af18f21543611269bef836d0333ba640f"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><b>optional</b> (<a class="el" href="structranges_1_1optional.html">optional</a>< U > const &that)</td></tr>
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template<typename U > <br />
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requires optional_should_convert<U, T> && constructible_from<T, U const &> && (!convertible_to<U const &, T>)</td></tr>
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<tr class="memitem:af1dc0197652fe815d64ec3e4c7ff76fd"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><b>optional</b> (<a class="el" href="structranges_1_1optional.html">optional</a>< U > const &that)</td></tr>
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<tr class="memitem:a9a21624229b471736ee49ba4220b32ef"><td class="memTemplParams" colspan="2"><a id="a9a21624229b471736ee49ba4220b32ef" name="a9a21624229b471736ee49ba4220b32ef"></a>
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template<typename U = T> <br />
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requires (!same_as<detail::decay_t<U>, <a class="el" href="structranges_1_1in__place__t.html">in_place_t</a>>) && (!same_as<detail::decay_t<U>, <a class="el" href="structranges_1_1optional.html">optional</a>>) && constructible_from<T, U> && convertible_to<U, T></td></tr>
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<tr class="memitem:a9a21624229b471736ee49ba4220b32ef"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><b>optional</b> (U &&v)</td></tr>
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<tr class="separator:a9a21624229b471736ee49ba4220b32ef"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a4961523bdbf70a1123e7d39402f76256"><td class="memTemplParams" colspan="2"><a id="a4961523bdbf70a1123e7d39402f76256" name="a4961523bdbf70a1123e7d39402f76256"></a>
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template<typename U = T> <br />
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requires (!same_as<detail::decay_t<U>, <a class="el" href="structranges_1_1in__place__t.html">in_place_t</a>>) && (!same_as<detail::decay_t<U>, <a class="el" href="structranges_1_1optional.html">optional</a>>) && constructible_from<T, U> && (!convertible_to<U, T>)</td></tr>
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<tr class="memitem:a4961523bdbf70a1123e7d39402f76256"><td class="memTemplItemLeft" align="right" valign="top">constexpr </td><td class="memTemplItemRight" valign="bottom"><b>optional</b> (U &&v)</td></tr>
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<tr class="separator:a4961523bdbf70a1123e7d39402f76256"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a1d6a04b4537e2c109ccaf72d38ccddd0"><td class="memItemLeft" align="right" valign="top"><a id="a1d6a04b4537e2c109ccaf72d38ccddd0" name="a1d6a04b4537e2c109ccaf72d38ccddd0"></a>
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constexpr T & </td><td class="memItemRight" valign="bottom"><b>value</b> () &</td></tr>
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<tr class="separator:a1d6a04b4537e2c109ccaf72d38ccddd0"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a09460af4ae2d2eb2bf2afc8cc9da0c7b"><td class="memItemLeft" align="right" valign="top"><a id="a09460af4ae2d2eb2bf2afc8cc9da0c7b" name="a09460af4ae2d2eb2bf2afc8cc9da0c7b"></a>
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constexpr T && </td><td class="memItemRight" valign="bottom"><b>value</b> () &&</td></tr>
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<tr class="separator:a09460af4ae2d2eb2bf2afc8cc9da0c7b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a014bd8e4c8a71e8b4c206ac8d629549b"><td class="memItemLeft" align="right" valign="top"><a id="a014bd8e4c8a71e8b4c206ac8d629549b" name="a014bd8e4c8a71e8b4c206ac8d629549b"></a>
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constexpr T const & </td><td class="memItemRight" valign="bottom"><b>value</b> () const &</td></tr>
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<tr class="separator:a014bd8e4c8a71e8b4c206ac8d629549b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aa1544296cc71d2962a28905b980418fc"><td class="memItemLeft" align="right" valign="top"><a id="aa1544296cc71d2962a28905b980418fc" name="aa1544296cc71d2962a28905b980418fc"></a>
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constexpr T const && </td><td class="memItemRight" valign="bottom"><b>value</b> () const &&</td></tr>
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<tr class="separator:aa1544296cc71d2962a28905b980418fc"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:affceeb030eb57058c45fb1caa06649cf"><td class="memTemplParams" colspan="2"><a id="affceeb030eb57058c45fb1caa06649cf" name="affceeb030eb57058c45fb1caa06649cf"></a>
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template<typename U > <br />
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requires move_constructible<T> && convertible_to<U, T></td></tr>
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<tr class="memitem:affceeb030eb57058c45fb1caa06649cf"><td class="memTemplItemLeft" align="right" valign="top">constexpr T </td><td class="memTemplItemRight" valign="bottom"><b>value_or</b> (U &&u) &&</td></tr>
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<tr class="memitem:a9a0c0ff3f8c6f75151df7aebd6138901"><td class="memTemplParams" colspan="2"><a id="a9a0c0ff3f8c6f75151df7aebd6138901" name="a9a0c0ff3f8c6f75151df7aebd6138901"></a>
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template<typename U > <br />
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requires copy_constructible<T> && convertible_to<U, T></td></tr>
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<tr class="memitem:a9a0c0ff3f8c6f75151df7aebd6138901"><td class="memTemplItemLeft" align="right" valign="top">constexpr T </td><td class="memTemplItemRight" valign="bottom"><b>value_or</b> (U &&u) const &</td></tr>
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</table>
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<li class="navelem"><b>ranges</b></li><li class="navelem"><a class="el" href="structranges_1_1optional.html">optional</a></li>
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