# std::isless

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< cpp‎ | numeric‎ | math

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.

### Parameters

x | - | floating point value
y | - | floating point value

### Return value

true if x < y, false otherwise

### Notes

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

less | function object implementing x < y (class template)
isgreater (C++11) | checks if the first floating-point argument is greater than the second (function)

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