std::copyable_function::operator=
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.Parameters
| other | - | another std::copyable_function object to copy or move the target of |
| f | - | a callable object to initialize the new target with |
Return value
*this
Example
See also
| assigns a new target (public member function of std::function<R(Args...)>) |
|
| replaces or destroys the target (public member function of std::move_only_function) |
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