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| optional (const none_t &=none) |
| Creates an instance without value.
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template<class U , class E = typename std::enable_if<std::is_convertible<U, T>::value>::type> |
| optional (U x) |
| Creates an valid instance from value .
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| optional (const optional &other) |
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| optional (optional &&other) noexcept(std::is_nothrow_move_constructible< T >::value) |
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optional & | operator= (const optional &other) |
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optional & | operator= (optional &&other) noexcept(std::is_nothrow_destructible< T >::value &&std::is_nothrow_move_assignable< T >::value) |
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| operator bool () const |
| Checks whether this object contains a value.
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bool | operator! () const |
| Checks whether this object does not contain a value.
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T & | operator* () |
| Returns the value.
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const T & | operator* () const |
| Returns the value.
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const T * | operator-> () const |
| Returns the value.
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T * | operator-> () |
| Returns the value.
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T & | value () |
| Returns the value.
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const T & | value () const |
| Returns the value.
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const T & | value_or (const T &default_value) const |
| Returns the value if m_valid , otherwise returns default_value .
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void | reset () |
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template<class... Ts> |
T & | emplace (Ts &&... xs) |
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(Note that these are not member functions.)
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template<class T > |
auto | to_string (const optional< T > &x) -> decltype(to_string(std::declval< const T & >())) |
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template<class T > |
T && | move_if_optional (optional< T > &x) |
| Returns an rvalue to the value managed by x .
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template<class T > |
T & | move_if_optional (T *x) |
| Returns *x .
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template<class T > |
bool | operator== (const optional< T > &lhs, const optional< T > &rhs) |
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template<class T > |
bool | operator!= (const optional< T > &lhs, const optional< T > &rhs) |
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template<class T > |
bool | operator< (const optional< T > &lhs, const optional< T > &rhs) |
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template<class T > |
bool | operator<= (const optional< T > &lhs, const optional< T > &rhs) |
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template<class T > |
bool | operator>= (const optional< T > &lhs, const optional< T > &rhs) |
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template<class T > |
bool | operator> (const optional< T > &lhs, const optional< T > &rhs) |
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template<class T > |
bool | operator== (const optional< T > &lhs, none_t) |
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template<class T > |
bool | operator== (none_t, const optional< T > &rhs) |
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template<class T > |
bool | operator!= (const optional< T > &lhs, none_t) |
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template<class T > |
bool | operator!= (none_t, const optional< T > &rhs) |
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template<class T > |
bool | operator< (const optional< T > &, none_t) |
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template<class T > |
bool | operator< (none_t, const optional< T > &rhs) |
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template<class T > |
bool | operator<= (const optional< T > &lhs, none_t) |
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template<class T > |
bool | operator<= (none_t, const optional< T > &) |
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template<class T > |
bool | operator> (const optional< T > &lhs, none_t) |
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template<class T > |
bool | operator> (none_t, const optional< T > &) |
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template<class T > |
bool | operator>= (const optional< T > &, none_t) |
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template<class T > |
bool | operator>= (none_t, const optional< T > &) |
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template<class T > |
bool | operator== (const optional< T > &lhs, const T &rhs) |
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template<class T > |
bool | operator== (const T &lhs, const optional< T > &rhs) |
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template<class T > |
bool | operator!= (const optional< T > &lhs, const T &rhs) |
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template<class T > |
bool | operator!= (const T &lhs, const optional< T > &rhs) |
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template<class T > |
bool | operator< (const optional< T > &lhs, const T &rhs) |
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template<class T > |
bool | operator< (const T &lhs, const optional< T > &rhs) |
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template<class T > |
bool | operator<= (const optional< T > &lhs, const T &rhs) |
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template<class T > |
bool | operator<= (const T &lhs, const optional< T > &rhs) |
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template<class T > |
bool | operator> (const optional< T > &lhs, const T &rhs) |
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template<class T > |
bool | operator> (const T &lhs, const optional< T > &rhs) |
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template<class T > |
bool | operator>= (const optional< T > &lhs, const T &rhs) |
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template<class T > |
bool | operator>= (const T &lhs, const optional< T > &rhs) |
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template<class T>
class caf::optional< T >
A C++17 compatible optional
implementation.