std::function<R(Args...)>::operator=
< cpp | utility | functional | function
function& operator=( const function& other ); |
(1) | (since C++11) |
function& operator=( function&& other ); |
(2) | (since C++11) |
(3) | ||
function& operator=( std::nullptr_t ); |
(since C++11) (until C++17) |
|
function& operator=( std::nullptr_t ) noexcept; |
(since C++17) | |
template< class F > function& operator=( F&& f ); |
(4) | (since C++11) |
template< class F > function& operator=( std::reference_wrapper<F> f ) noexcept; |
(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
Notes
Even before allocator support was removed from std::function
in C++17, these assignment operators use the default allocator rather than the allocator of *this
or the allocator of other
(see LWG #2386).
See also
(until C++17) |
assigns a new target (public member function) |