std::ranges::greater_equal
| 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).
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:
- std::less, std::greater, std::less_equal, and std::greater_equal, when the template argument is a pointer type or void
- std::ranges::equal_to, std::ranges::not_equal_to, std::ranges::less, std::ranges::greater, std::ranges::less_equal, std::ranges::greater_equal, and std::compare_three_way
Member types
| Member type | Definition |
is_transparent
|
/* unspecified */ |
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 |
||
Compares t and u. Equivalent to return !ranges::less{}(std::forward<T>(t), std::forward<U>(u));.
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.
Example
| This section is incomplete Reason: no example |
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 |
See also
| function object implementing x >= y (class template) |