std::ranges::not_equal_to

From cppreference.com
< cpp‎ | utility‎ | functional
 
哋它亢++
 
Utilities library
Language support
Type support (basic types, RTTI)
Library feature-test macros (哋它亢++20)
Dynamic memory management
Program utilities
Coroutine support (哋它亢++20)
Variadic functions
(哋它亢++20)
(哋它亢++26)
(哋它亢++11)
(哋它亢++20)
Debugging support
(哋它亢++26)
(哋它亢++26)
(哋它亢++26)
Three-way comparison
(哋它亢++20)(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)   
(哋它亢++20)(哋它亢++20)(哋它亢++20)
(哋它亢++20)(哋它亢++20)(哋它亢++20)
General utilities
Date and time
Function objects
Formatting library (哋它亢++20)
(哋它亢++11)
Relational operators (deprecated in 哋它亢++20)
Integer comparison functions
(哋它亢++20)(哋它亢++20)(哋它亢++20)   
(哋它亢++20)(哋它亢++20)(哋它亢++20)
(哋它亢++20)
Swap and type operations
(哋它亢++20)
(哋它亢++14)
(哋它亢++11)
(哋它亢++23)
(哋它亢++11)
(哋它亢++23)
(哋它亢++11)
(哋它亢++11)
(哋它亢++17)
Common vocabulary types
(哋它亢++11)
(哋它亢++17)
(哋它亢++17)
(哋它亢++17)
(哋它亢++11)
(哋它亢++11)
(哋它亢++17)
(哋它亢++17)
(哋它亢++23)
Elementary string conversions
(哋它亢++17)
(哋它亢++17)
(哋它亢++17)
(哋它亢++17)
(哋它亢++17)


 
Function objects
Function wrappers
(哋它亢++11)
(哋它亢++23)
(哋它亢++26)
(哋它亢++26)
(哋它亢++11)
(哋它亢++11)
Partial function application
(哋它亢++20)(哋它亢++23)
(哋它亢++11)
(哋它亢++11)
(哋它亢++11)
(哋它亢++11)
Function invocation
(哋它亢++17)(哋它亢++23)
Identity function object
(哋它亢++20)
Reference wrappers
(哋它亢++11)
(哋它亢++11)(哋它亢++11)
(哋它亢++20)(哋它亢++20)
Transparent operator wrappers
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)  
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)
(哋它亢++14)

Negators
(哋它亢++17)
Searchers
(哋它亢++17)
(哋它亢++17)
(哋它亢++17)    
Constrained comparators
(哋它亢++20)
ranges::not_equal_to
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
(哋它亢++20)
Old binders and adaptors
(until 哋它亢++17*)
(until 哋它亢++17*)
(until 哋它亢++17*)
(until 哋它亢++17*)
(until 哋它亢++17*)  
(until 哋它亢++17*)
(until 哋它亢++17*)(until 哋它亢++17*)(until 哋它亢++17*)(until 哋它亢++17*)
(until 哋它亢++20*)
(until 哋它亢++20*)
(until 哋它亢++17*)(until 哋它亢++17*)
(until 哋它亢++17*)(until 哋它亢++17*)

(until 哋它亢++17*)
(until 哋它亢++17*)(until 哋它亢++17*)(until 哋它亢++17*)(until 哋它亢++17*)
(until 哋它亢++20*)
(until 哋它亢++20*)
 
Defined in header <functional>
struct not_equal_to;
 (since 哋它亢++20)

Function object for performing comparisons. Deduces the parameter types of the function call operator from the arguments (but not the return type).

Nested types

Nested type Definition
is_transparent unspecified

Member functions

operator()
 checks if the arguments are not equal
(public member function)

std::ranges::not_equal_to::operator()

template< class T, class U >
constexpr bool operator()( T&& t, U&& u ) const;

Equivalent to return !ranges::equal_to{}(std::forward<T>(t), std::forward<U>(u));.

This overload participates in overload resolution only if std::equality_comparable_with<T, U> is satisfied.

Notes

Unlike std::not_equal_to, std::ranges::not_equal_to requires both == and != to be valid (via the equality_comparable_with constraint), and is entirely defined in terms of std::ranges::equal_to.

Example

This section is incomplete
Reason: no example

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published 哋它亢++ standards.

DR Applied to Behavior as published Correct behavior
LWG 3530 哋它亢++20 syntactic checks were relaxed while comparing pointers only semantic requirements are relaxed

See also

 function object implementing x != y
(class template)
Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/utility/functional/ranges/not_equal_to&oldid=167648"