std::experimental::function::operator= (3) Linux Manual Page

std::experimental::function<R(Args…)>::operator= – std::experimental::function<R(Args…)>::operator=

Synopsis

function &operator=(const function &other);
(1)(library fundamentals TS)

    function &
    operator=(function &&other);
(2)(library fundamentals TS)

    function &
    operator=(std::nullptr_t) noexcept;
(3)(library fundamentals TS)

    template <class F>
    (4)(library fundamentals TS)

        function &
        operator=(F &&f);

template <class F>
(5)(library fundamentals TS)

    function &
    operator=(std::reference_wrapper<F> f);
Assigns a new target to std::experimental::function.In the description below, let ALLOCATOR_OF(f) be the allocator specified in the construction of f, or the value of std::experimental::pmr::get_default_resource() at the time of construction if no allocator was specified.

1) Assigns a copy of target of other, as if by executing function(std::allocator_arg, ALLOCATOR_OF(*this), other).swap(*this);

2) Moves the target of other to *this, as if by executing function(std::allocator_arg, ALLOCATOR_OF(*this), std::move(other)).swap(*this);. other is in a valid state with an unspecified value.

3) Destroys the target of *this. *this is empty after the call. The memory resource returned by get_memory_resource() after the assignment is equivalent to the memory resource before the assignment, but the address may change.

4) Sets the target of *this to the callable f, as if by executing function(std::allocator_arg, ALLOCATOR_OF(*this),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.

    5) Sets the target of * this to a copy of f,
    as if by executing function(std::allocator_arg, ALLOCATOR_OF(*this), f).swap(*this);

Parameters

other – another std::experimental::function object to copy or move from
f – a callable to initialize the target with

Type requirements

–
F must meet the requirements of Callable.

Return value

*this

Exceptions

1-2,4-5) (none)