caf::optional< T > Class Template Reference

A C++17 compatible optional implementation. More...

#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)

Detailed Description

template<class T>
class caf::optional< T >

A C++17 compatible optional implementation.

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The documentation for this class was generated from the following files:

• libcaf_core/caf/fwd.hpp
• libcaf_core/caf/optional.hpp