std::copyable_function::operator= - cppreference.com (original) (raw)

copyable_function& operator=( const copyable_function& other ); (1) (since C++26)
copyable_function& operator=( copyable_function&& other ); (2) (since C++26)
copyable_function& operator=( std::nullptr_t ) noexcept; (3) (since C++26)
template< class F >copyable_function& operator=( F&& f ); (4) (since C++26)

Assigns a new target to std::copyable_function or destroys its target.

  1. Assigns a copy of the target of other to *this as if by executing auto(other).swap(*this).

  2. Moves the target of other to *this or destroys the target of *this (if any) if other is empty, by auto(std::move(other)).swap(*this). other is in a valid state with an unspecified value after move assignment.

  3. Destroys the current target if it exists. *this is empty after the call.

  4. Sets the target of *this to the callable f, or destroys the current target if f is a null function pointer, a null pointer to member function, or an empty std::copyable_function, as if by executing copyable_function(std::forward<F>(f)).swap(*this);. This overload participates in overload resolution only if the constructor of copyable_function from F participates in overload resolution. The program is ill-formed or has undefined behavior if the selected constructor call is ill-formed or has undefined behavior.

[edit] Parameters

other - another std::copyable_function object to copy or move the target of
f - a callable object to initialize the new target with

[edit] Return value

*this

[edit] Example

[edit] See also

| | assigns a new target (public member function of std::function<R(Args...)>) [edit] | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | replaces or destroys the target (public member function of std::move_only_function) [edit] |