Reference for package '#rtl'

TDoubleHelper.IsNan

Check whether a value equals NaN.

Declaration

Source position: syshelph.inc line 288

public 
  class function IsNan(const AValue: Double) : Boolean;  Overload;  Static;
  function 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

Name Description
TDoubleHelper.IsInfinity Check whether a value is positive or negative infinity.
TDoubleHelper.IsNegativeInfinity Check whether a value is negative infinity.
TDoubleHelper.IsPositiveInfinity Check whether a value is positive infinity.