[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] Reference for unit 'sysutils' (#rtl)

TDoubleHelper.IsNan

Check whether a value equals NaN.

Declaration

Source position: syshelph.inc line 267

public class function TDoubleHelper.IsNan(

  const AValue: Double

):Boolean; overload;

function TDoubleHelper.IsNan: Boolean; overload;

Description

IsNan checks whether a Double-sized floating point value is NaN (Not a Number). If so, it returns True. When the class function version is used, the value can be specified using AValue. In the method version, the used value is (Self).

See also

TDoubleHelper.IsInfinity

  

Check whether a value is positive or negative infinity.

TDoubleHelper.IsPositiveInfinity

  

Check whether a value is positive infinity.

TDoubleHelper.IsNegativeInfinity

  

Check whether a value is negative infinity.


Documentation generated on: Mar 17 2017