operator==,!=(std::experimental::function)

 

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

 

Defined in header <experimental/functional>
template< class R, class... ArgTypes > bool operator==( const std::experimental::function<R(ArgTypes...)>& f,                  std::nullptr_t ) noexcept;	(1)	(library fundamentals TS)
template< class R, class... ArgTypes > bool operator==( std::nullptr_t,                  const std::experimental::function<R(ArgTypes...)>& f ) noexcept;	(2)	(library fundamentals TS) (removed in library fundamentals TS v3)
template< class R, class... ArgTypes > bool operator!=( const std::experimental::function<R(ArgTypes...)>& f,                  std::nullptr_t ) noexcept;	(3)	(library fundamentals TS) (removed in library fundamentals TS v3)
template< class R, class... ArgTypes > bool operator!=( std::nullptr_t,                  const std::experimental::function<R(ArgTypes...)>& f ) noexcept;	(4)	(library fundamentals TS) (removed in library fundamentals TS v3)

Compares a std::experimental::function with a null pointer. Empty functions (that is, functions without a callable target) compare equal, non-empty functions compare non-equal.

The != operator is synthesized from operator==.

(library fundamentals TS v3)

Parameters

f

-

std::experimental::function to compare

Return value

1,2) !f

3,4) (bool) f

See also

operator==operator!= (removed in C++20)

compares a std::function with nullptr (function template)

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