std::function::operator=
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< cpp | utility | functional | function
| function& operator=( const function& other ); |
(1) | (since C++11) |
| function& operator=( function&& other ); |
(2) | (since C++11) |
| function& operator=( std::nullptr_t ); |
(3) | (since C++11) |
| template< class F > function& operator=( F&& f ); |
(4) | (since C++11) |
| template< class F > function& operator=( std::reference_wrapper<F> f ); |
(5) | (since C++11) |
Assigns a new target to std::function.
1) Assigns a copy of target of
other, as if by executing function(other).swap(*this);2) Moves the target of
other to *this. other is in a valid state with an unspecified value.3) Drops the current target. *this is empty after the call.
4) Sets the target of *this to the callable
f, as if by executing function(std::forward<F>(f)).swap(*this);. This operator does not participate in overload resolution unless f is Callable for argument types Args... and return type R. (since C++14)5) Sets the target of *this to a copy of
f, as if by executing function(f).swap(*this);Parameters
| other | - | another std::function object to copy the target of
|
| f | - | a callable to initialize the target with |
| Type requirements | ||
-F must meet the requirements of Callable.
| ||
Return value
*this
Exceptions
1-2) (none)
3)
|
(none) |
(until C++17) |
|
noexcept specification:
noexcept |
(since C++17) |
4) (none)
5)
noexcept specification:
noexcept
Notes
The move assignment operator uses the default allocator rather than the allocator of *this or the allocator of other (LWG #2386)
See also
| (until C++17) |
assigns a new target (public member function) |