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

 

C++

Language

Standard library headers

Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Technical specifications

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals 2 TS)

Extensions for parallelism (parallelism TS)

Extensions for concurrency (concurrency TS)

Concepts (concepts TS)

Ranges (ranges TS)

Special mathematical functions (special math TR)

 

Library fundamentals

experimental::optional

experimental::any

experimental::basic_string_view

experimental::sample

experimental::shared_ptr

experimental::weak_ptr

experimental::apply

experimental::invocation_type experimental::raw_invocation_type

experimental::search

experimental::default_searcher experimental::make_default_searcher

experimental::boyer_moore_searcher experimental::make_boyer_moore_searcher

experimental::boyer_moore_horspool_searcher experimental::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

 

template< class R, class... ArgTypes > bool operator==( const std::experimental::function<R(ArgTypes...)>& f, std::nullptr_t );	(1)	(library fundamentals TS)
template< class R, class... ArgTypes > bool operator==( std::nullptr_t, const std::experimental::function<R(ArgTypes...)>& f );	(2)	(library fundamentals TS)
template< class R, class... ArgTypes > bool operator!=( const std::experimental::function<R(ArgTypes...)>& f, std::nullptr_t );	(3)	(library fundamentals TS)
template< class R, class... ArgTypes > bool operator!=( std::nullptr_t, const std::experimental::function<R(ArgTypes...)>& f );	(4)	(library fundamentals TS)

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.

Parameters

f

-

std::experimental::function to compare

Return value

1-2) !f

3-4) (bool) f

Exceptions

noexcept specification:  

noexcept

  

See also

operator==operator!=

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