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template<typename... Args> |
requires constructible_from< T, Args... > T & | emplace (Args &&... args) noexcept(std::is_nothrow_constructible< T, Args... >::value) |
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template<typename E , typename... Args> |
requires constructible_from< T, std::initializer_list< E > &, Args... > T & | emplace (std::initializer_list< E > il, Args &&... args) noexcept(std::is_nothrow_constructible< T, std::initializer_list< E > &, Args... >::value) |
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template<typename U > |
requires optional_should_convert< U, T > &&constructible_from< T, U const & > | explicit (!convertible_to< U const &, T >) optional(optional< U > const &that) |
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constexpr | operator bool () const noexcept |
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constexpr optional & | operator= (nullopt_t) noexcept |
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optional & | operator= (optional &&)=default |
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optional & | operator= (optional const &)=default |
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template<typename U > |
requires optional_should_convert_assign< U, T > &&constructible_from< T, U > &&constexpr assignable_from< T &, U > optional & | operator= (optional< U > &&that) |
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template<typename U > |
requires optional_should_convert_assign< U, T > &&constructible_from< T, const U & > &&constexpr assignable_from< T &, const U & > optional & | operator= (optional< U > const &that) |
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std::is_scalar &&same_as< T, detail::decay_t< U > > &&constructible_from< T, U > &&constexpr assignable_from< T &, U > optional & | operator= (U &&u) noexcept(std::is_nothrow_constructible< T, U >::value &&std::is_nothrow_assignable< T &, U >::value) |
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template<typename E , typename... Args> |
requires constexpr constructible_from< T, std::initializer_list< E > &, Args... > | optional (in_place_t, std::initializer_list< E > il, Args &&... args) noexcept(std::is_nothrow_constructible< T, std::initializer_list< E > &, Args... >::value) |
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constexpr | optional (nullopt_t) noexcept |
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| optional (optional &&)=default |
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| optional (optional const &)=default |
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template<typename U > |
requires optional_should_convert< U, T > &&constructible_from< T, U > &&convertible_to< U, T > | optional (optional< U > &&that) |
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template<typename U > |
requires optional_should_convert< U, T > &&constructible_from< T, U > &&!convertible_to< U, T > | optional (optional< U > &&that) |
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template<typename U = T> |
| requires (!same_as< detail::decay_t< U >, in_place_t >) &&(!same_as< detail |
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template<typename U = T> |
| requires (!same_as< optional, detail::decay_t< U >>) &&(!(satisfies< T |
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constexpr T & | value () & |
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constexpr T && | value () && |
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constexpr T const & | value () const & |
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constexpr T const && | value () const && |
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template<typename U > |
requires move_constructible< T > &&constexpr convertible_to< U, T > T | value_or (U &&u) && |
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template<typename U > |
requires copy_constructible< T > &&constexpr convertible_to< U, T > T | value_or (U &&u) const & |
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