_isunordered, _isunorderedf
9/7/2007
_isunordered compares two doubles to determine if they are unordered.
_isunorderedf compares two floats to determine if they are unordered.
Syntax
int __cdecl _isunordered(
double arg1,
double arg2
);
int __cdecl _isunorderedf(
float arg1,
float arg2
);
Parameters
- arg1
[in] The value to be compared to arg2.
- arg2
[in] The value to be compared to arg1.
Return Values
Returns a Boolean value.
TRUE indicates that arg1 and arg2 are unordered.
Remarks
IEEE-754 floating-point comparison can have four separate result values: less-than, equal-to, greater-than or unordered.
The first three conditions can be tested using normal C operators, and this function is used to test for the last condition.
Two values are unordered if either is a NaN. This means that a NaN is not equal to any value, even itself.
The C++ compiler returns a bool value instead of an int.
Requirements
| Routine | Required header | Architecture |
|---|---|---|
_isunordered |
<cmnintrin.h> |
x86, ARM, SH-4, MIPS |
_isunorderedf |
<cmnintrin.h> |
x86, ARM, SH-4, MIPS |