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

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Diagnostics library

Memory management library

Metaprogramming library (C++11)

General utilities library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library (C++17)

Concurrency support library (C++11)

Execution control library (C++26)

Technical specifications

Symbols index

External libraries

 

Experimental

Technical Specification

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals TS v2)

Library fundamentals 3 (library fundamentals TS v3)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Extensions for concurrency 2 (concurrency TS v2)

Concepts (concepts TS)

Ranges (ranges TS)

Reflection (reflection TS)

Mathematical special functions (special functions TR)

Experimental Non-TS

Pattern Matching

Linear Algebra

std::execution

Contracts

2D Graphics

 

Library fundamentals

experimental::optional

experimental::any

experimental::basic_string_view

experimental::sample

experimental::shared_ptr

experimental::weak_ptr

experimental::apply

experimental::invocation_typeexperimental::raw_invocation_type

experimental::search

experimental::default_searcherexperimental::make_default_searcher

experimental::boyer_moore_searcherexperimental::make_boyer_moore_searcher

experimental::boyer_moore_horspool_searcherexperimental::make_boyer_moore_horspool_searcher

Type-erased and polymorphic allocators

Variable templates for type traits

 

Polymorphic allocator library

polymorphic_allocator

Convenience aliases for containers using polymorphic_allocator

Memory resource classes

memory_resource

synchronized_pool_resource

unsynchronized_pool_resource

monotonic_buffer_resource

resource_adaptor

Global memory resources

new_delete_resource

null_memory_resource

get_default_resource

set_default_resource

Type-erased allocator support for existing classes

function

packaged_task

promise

 

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 > function& operator=( F&& f );	(4)	(library fundamentals TS)
	(5)
template< class F > function& operator=( std::reference_wrapper<F> f );			(library fundamentals TS)
template< class F > function& operator=( std::reference_wrapper<F> f ) noexcept;			(library fundamentals TS v3)

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()(until library fundamentals TS v3)the default-constructed std::pmr::polymorphic_allocator<> value(library fundamentals TS v3) 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) Exception thrown on needed allocation of the storage or initialization of the target of *this, if any.

5) (none)

Notes

The move assignment operator may need to allocate storage if get_memory_resource() != other.get_memory_resource()(until library fundamentals TS v3)get_allocator() != other.get_allocator()(library fundamentals TS v3)

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