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Function std.math.isNaN

Determines if x is NaN.

Prototype

bool isNaN(X)(
  X x
) pure nothrow @nogc @trusted
if (isFloatingPoint!X);

params

x = a floating point number.

returns

true if x is Nan.

Example

assert( isNaN(float.init));
assert( isNaN(-double.init));
assert( isNaN(real.nan));
assert( isNaN(-real.nan));
assert(!isNaN(cast(float)53.6));
assert(!isNaN(cast(real)-53.6));

Authors

Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw

License

Boost License 1.0.

Comments