std::ranges::less_equal - cppreference.com
From cppreference.com
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(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).
Nested types
Member functions
| checks if the first argument is less than or equal to the second (public member function) |
std::ranges::less_equal::operator()
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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.
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.
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 |
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| LWG 3530 | C++20 | syntactic checks were relaxed while comparing pointers | only semantic requirements are relaxed |