Namespaces
Variants
Views
Actions

std::ranges::greater_equal

From cppreference.com
< cpp‎ | utility‎ | functional
 
 
Utilities library
General utilities
Relational operators (deprecated in C++20)
Integer comparison functions
(C++20)(C++20)(C++20)   
(C++20)
Swap and type operations
(C++14)
(C++11)

(C++11)
(C++11)
(C++17)
Common vocabulary types
(C++11)
(C++17)
(C++17)
(C++17)
(C++11)
(C++17)

Elementary string conversions
(C++17)
(C++17)

Stacktrace
 
Function objects
Function wrappers
(C++11)
(C++11)
Partial function application
(C++20)
(C++11)
Function invocation
(C++17)(C++23)
Identity function object
(C++20)
Reference wrappers
(C++11)(C++11)
Transparent operator wrappers
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
Negators
(C++17)
Searchers
Constrained comparators
ranges::greater_equal
(C++20)
Old binders and adaptors
(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 greater_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] Implementation-defined strict total order over pointers

The function call operator yields the implementation-defined strict total order over pointers if the < operator between arguments invokes a built-in comparison operator for a pointer, even if the built-in < operator does not.

The implementation-defined strict total order is consistent with the partial order imposed by built-in comparison operators (<=>, <, >, <=, and >=), and consistent among following standard function objects:

[edit] Member types

Member type Definition
is_transparent /* unspecified */

[edit] Member functions

operator()
checks if the first argument is greater than or equal to the second
(public member function)

std::ranges::greater_equal::operator()

template< class T, class U >

    requires std::totally_ordered_with<T, U> // with different semantic requirements

constexpr bool operator()(T&& t, U&& u) const;

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

[edit] Notes

Unlike std::greater_equal, std::ranges::greater_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

[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 relaxed

[edit] See also

function object implementing x >= y
(class template) [edit]