Defined in header <cmath>
bool isless( float x, float y );
(1) (since C++11)
bool isless( double x, double y );
(2) (since C++11)
bool isless( long double x, long double y );
(3) (since C++11)
bool isless( Arithmetic x, Arithmetic y );
(4) (since C++11)
1-3) Determines if the floating point number x is less than the floating-point number y, without setting floating-point exceptions.
4) A set of overloads or a function template for all combinations of arguments of arithmetic type not covered by (1-3). If any argument has integral type, it is cast to double.


x - floating point value
y - floating point value

Return value

true if x < y, false otherwise.


The built-in 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 operator<.

See also

function object implementing x < y
(class template)
checks if the first floating-point argument is greater than the second

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