std::islessgreater(3)

NAME
std::islessgreater - std::islessgreater

Synopsis
   Defined in header <cmath>
   bool islessgreater( float x, float y );
                        (since C++11)
   bool islessgreater( double x, double y ); (until C++23)
   bool islessgreater( long double x, long double y );
   constexpr bool islessgreater( /* floating-point-type
   */ x, (1) (since C++23)
                        /* floating-point-type
   */ y );
   Additional overloads
   Defined in header <cmath>
   template< class Arithmetic1, class Arithmetic2 > (A) (since C++11)
   bool islessgreater( Arithmetic1 x, Arithmetic2 y ); (constexpr since C++23)
   1) Determines if the floating point number x is less than or greater than the
   floating-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 || x > y, false otherwise.

Notes
   The built-in operator< and operator> for floating-point numbers may raise FE_INVALID
   if one or both of the arguments is NaN. This function is a "quiet" version of the
   expression x < y || x > y.
   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::islessgreater(num1, num2) has the same effect as
       std::islessgreater(static_cast<long double>(num1),
                        static_cast<long double>(num2)).
     * Otherwise, if num1 and/or num2 has type double or an integer type,
       then std::islessgreater(num1, num2) has the same effect as (until C++23)
       std::islessgreater(static_cast<double>(num1),
                        static_cast<double>(num2)).
     * Otherwise, if num1 or num2 has type float, then
       std::islessgreater(num1, num2) has the same effect as
       std::islessgreater(static_cast<float>(num1),
                        static_cast<float>(num2)).
   If num1 and num2 have arithmetic types, then std::islessgreater(num1,
   num2) has the same effect as std::islessgreater(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 (since C++23)
   num1 and num2, 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 candidate
   from the overloads provided.

See also
   isless checks if the first floating-point argument is less than the second
   (C++11) (function)
   isgreater checks if the first floating-point argument is greater than the second
   (C++11) (function)
   C documentation for
   islessgreater