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std::isless(3) C++ Standard Libary std::isless(3) NAME std::isless - std::isless Synopsis Defined in header <cmath> bool isless( float x, float y ); (since C++11) bool isless( double x, double y ); (until C++23) bool isless( long double x, long double y ); constexpr bool isless( /* floating-point-type */ x, (1) /* floating-point-type */ y (since C++23) ); Additional overloads Defined in header <cmath> template< class Arithmetic1, class Arithmetic2 > (A) (since C++11) bool isless( Arithmetic1 x, Arithmetic2 y ); (const- expr since C++23) 1) Determines if the floating point number x is less than the float- ing-point number y, without setting floating-point exceptions. The library provides overloads for all cv-unqualified floating-point types as the type of the parameters x and y. (since C++23) A) Additional overloads are provided for all other combinations of arithmetic types. Parameters x, y - floating-point or integer values Return value true if x < y, false otherwise. Notes The built-in operator< for floating-point numbers may raise FE_IN- VALID if one or both of the arguments is NaN. This function is a "quiet" version of operator<. The additional overloads are not required to be provided exactly as (A). They only need to be sufficient to ensure that for their first argument num1 and second argument num2: * If num1 or num2 has type long double, then std::isless(num1, num2) has the same effect as std::isless(static_cast<long dou- ble>(num1), static_cast<long double>(num2)). * Otherwise, if num1 and/or num2 has type double or an integer type, then std::isless(num1, num2) has the same effect as (until C++23) std::isless(static_cast<double>(num1), static_cast<double>(num2)). * Otherwise, if num1 or num2 has type float, then std::is- less(num1, num2) has the same effect as std::isless(sta- tic_cast<float>(num1), static_cast<float>(num2)). If num1 and num2 have arithmetic types, then std::isless(num1, num2) has the same effect as std::isless(static_cast</* common-floating-point-type */>(num1), static_cast</* common-floating-point-type */>(num2)), where /* common-floating-point-type */ is the floating-point type with the greatest floating-point conversion rank and greatest floating-point conversion subrank between the types of num1 and num2, (since C++23) arguments of integer type are considered to have the same floating-point conversion rank as double. If no such floating-point type with the greatest rank and subrank exists, then overload resolution does not result in a usable candi- date from the overloads provided. See also less function object implementing x < y (class template) isgreater checks if the first floating-point argument is greater than the second (C++11) (function) C documentation for isless http://cppreference.com 2024.06.10 std::isless(3)
NAME | Synopsis | Parameters | Return value | Notes | See also
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