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bool isunordered( float x, float y );
 ( C++11)
bool isunordered( double x, double y );
 ( C++11)
bool isunordered( long double x, long double y );
 ( C++11)
, x y , , NaN , , .
:
Determines if the floating point numbers x and y are unordered, that is, one or both are NaN and thus cannot be meaningfully compared with each other.
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x
:
floating point value
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y
:
floating point value
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true, x y NaN, false
:
true if either x or y is NaN, false otherwise
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