std::ranges::less_equal
From cppreference.com
< cpp | utility | functional
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Utilities library
Relational operators (deprecated in C++20) Integer comparison functions
Swap and type operations Common vocabulary types
Type support (basic types, RTTI)
Library feature-test macros (C++20)
(C++11)
(C++20)
(C++26)
(C++20)
Coroutine support (C++20)
Contract support (C++26)
(C++20)(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)(C++20)
(C++20)(C++20)(C++20)
General utilities
(C++20)(C++20)(C++20)
(C++20)(C++20)(C++20)
(C++20)
Function objects
Old binders and adaptors
(C++11)
(C++23)
(C++26)
(C++26)
(C++11)
(C++11)
(C++20)(C++23)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)(C++11)
(C++20)(C++20)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++17)
(C++17)
(C++17)
(C++17)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
ranges::less_equal
(C++20)
(C++20)
(until C++17*)
(until C++17*)
(until C++17*)
(until C++17*)
(until C++17*)
(until C++17*)
(until C++17*)(until C++17*)(until C++17*)(until C++17*)
(until C++20*)
(until C++20*)
(until C++17*)(until C++17*)
(until C++17*)(until C++17*)
(until C++17*)
(until C++17*)(until C++17*)(until C++17*)(until C++17*)
(until C++20*)
(until C++20*)
Defined in header
<functional>
struct less_equal;
(since C++20)
Function object for performing comparisons. Deduces the parameter types of the function call operator from the arguments (but not the return type).
Contents
[edit] Nested types
Nested type
Definition
is_transparent
unspecified
[edit] Member functions
operator()
(public member function)
std::ranges::less_equal::operator()
template< class T, class U >
constexpr bool operator()( T&& t, U&& u ) const;
constexpr bool operator()( T&& t, U&& u ) const;
Equivalent to return !ranges::less {}(std::forward <U>(u), std::forward <T>(t));.
This overload participates in overload resolution only if std::totally_ordered_with <T, U> is satisfied.
[edit] Notes
Unlike std::less_equal , std::ranges::less_equal requires all six comparison operators <, <=, >, >=, == and != to be valid (via the totally_ordered_with constraint) and is entirely defined in terms of
std::ranges::less.
[edit] Example
This section is incomplete
Reason: no example
Reason: no example
[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 3530 | C++20 | syntactic checks were relaxed while comparing pointers | only semantic requirements are relaxed |