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std::less_equal(3) C++ Standard Libary std::less_equal(3) NAME std::less_equal - std::less_equal Synopsis Defined in header <functional> template<> (since C++14) class less_equal<void>; std::less_equal<void> is a specialization of std::less_equal with parameter and return type deduced. Member functions operator() tests if lhs compares less or equal than rhs (public member function) std::less_equal<void>::operator() template< class T, class U > constexpr auto operator()( T&& lhs, U&& rhs ) const -> decltype(std::forward<T>(lhs) <= std::forward<U>(rhs)); Returns the result of std::forward<T>(lhs) <= std::forward<U>(rhs). Parameters lhs, rhs - values to compare Return value std::forward<T>(lhs) <= std::forward<U>(rhs). If a built-in operator comparing pointers is called, the result is consistent with the implementation-defined strict total order over pointers. Exceptions May throw implementation-defined exceptions. Example // Run this code #include <algorithm> #include <functional> #include <initializer_list> constexpr bool strictly_not_positive(int lhs) { return std::less_equal<>()(lhs, 0); } int main() { constexpr int low = 0, high = 8; std::less_equal<> less_equal{}; static_assert(less_equal(low, high)); static_assert(less_equal(low, low)); static constexpr auto arr = {1, 0, -1, -2, -3, -4}; static_assert(!std::all_of(arr.begin(), arr.end(), strictly_not_positive)); static_assert(std::all_of(arr.begin() + 1, arr.end(), strictly_not_positive)); } Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Cor- rect behavior LWG 2562 C++98 the pointer total order might be guaranteed to be consistent inconsistent http://cppreference.com 2024.06.10 std::less_equal(3)
NAME | Synopsis | Member functions | Parameters | Return value | Exceptions | Example
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