C++ Actor Framework 0.19
|
A C++17 compatible optional
implementation.
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#include <optional.hpp>
Public Types | |
using | type = T |
Type alias for T . | |
using | value_type = T |
Public Member Functions | |
optional (const none_t &=none) | |
Creates an instance without value. | |
template<class U , class E = std::enable_if_t<std::is_convertible_v<U, T>>> | |
optional (U x) | |
Creates an valid instance from value . | |
optional (const optional &other) | |
optional (optional &&other) noexcept(std::is_nothrow_move_constructible_v< T >) | |
optional & | operator= (const optional &other) |
optional & | operator= (optional &&other) noexcept(std::is_nothrow_destructible_v< T > &&std::is_nothrow_move_assignable_v< T >) |
operator bool () const | |
Checks whether this object contains a value. | |
bool | operator! () const |
Checks whether this object does not contain a value. | |
T & | operator* () |
Returns the value. | |
const T & | operator* () const |
Returns the value. | |
const T * | operator-> () const |
Returns the value. | |
T * | operator-> () |
Returns the value. | |
T & | value () |
Returns the value. | |
const T & | value () const |
Returns the value. | |
const T & | value_or (const T &default_value) const |
Returns the value if m_valid , otherwise returns default_value . | |
void | reset () |
template<class... Ts> | |
T & | emplace (Ts &&... xs) |
Related Symbols | |
(Note that these are not member symbols.) | |
template<class T > | |
auto | to_string (const optional< T > &x) -> decltype(to_string(std::declval< const T & >())) |
template<class T > | |
T && | move_if_optional (optional< T > &x) |
Returns an rvalue to the value managed by x . | |
template<class T > | |
T & | move_if_optional (T *x) |
Returns *x . | |
template<class T > | |
bool | operator== (const optional< T > &lhs, const optional< T > &rhs) |
template<class T > | |
bool | operator!= (const optional< T > &lhs, const optional< T > &rhs) |
template<class T > | |
bool | operator< (const optional< T > &lhs, const optional< T > &rhs) |
template<class T > | |
bool | operator<= (const optional< T > &lhs, const optional< T > &rhs) |
template<class T > | |
bool | operator>= (const optional< T > &lhs, const optional< T > &rhs) |
template<class T > | |
bool | operator> (const optional< T > &lhs, const optional< T > &rhs) |
template<class T > | |
bool | operator== (const optional< T > &lhs, none_t) |
template<class T > | |
bool | operator== (none_t, const optional< T > &rhs) |
template<class T > | |
bool | operator!= (const optional< T > &lhs, none_t) |
template<class T > | |
bool | operator!= (none_t, const optional< T > &rhs) |
template<class T > | |
bool | operator< (const optional< T > &, none_t) |
template<class T > | |
bool | operator< (none_t, const optional< T > &rhs) |
template<class T > | |
bool | operator<= (const optional< T > &lhs, none_t) |
template<class T > | |
bool | operator<= (none_t, const optional< T > &) |
template<class T > | |
bool | operator> (const optional< T > &lhs, none_t) |
template<class T > | |
bool | operator> (none_t, const optional< T > &) |
template<class T > | |
bool | operator>= (const optional< T > &, none_t) |
template<class T > | |
bool | operator>= (none_t, const optional< T > &) |
template<class T > | |
bool | operator== (const optional< T > &lhs, const T &rhs) |
template<class T > | |
bool | operator== (const T &lhs, const optional< T > &rhs) |
template<class T > | |
bool | operator!= (const optional< T > &lhs, const T &rhs) |
template<class T > | |
bool | operator!= (const T &lhs, const optional< T > &rhs) |
template<class T > | |
bool | operator< (const optional< T > &lhs, const T &rhs) |
template<class T > | |
bool | operator< (const T &lhs, const optional< T > &rhs) |
template<class T > | |
bool | operator<= (const optional< T > &lhs, const T &rhs) |
template<class T > | |
bool | operator<= (const T &lhs, const optional< T > &rhs) |
template<class T > | |
bool | operator> (const optional< T > &lhs, const T &rhs) |
template<class T > | |
bool | operator> (const T &lhs, const optional< T > &rhs) |
template<class T > | |
bool | operator>= (const optional< T > &lhs, const T &rhs) |
template<class T > | |
bool | operator>= (const T &lhs, const optional< T > &rhs) |
A C++17 compatible optional
implementation.