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Function `std.math.NaN`

Create a quiet NAN, storing an integer inside the payload.


						
				real NaN
				(
				

				  ulong payload
				

				) pure nothrow @nogc @trusted;

For floats, the largest possible payload is 0x3F_FFFF. For doubles, it is 0x3_FFFF_FFFF_FFFF. For 80-bit or 128-bit reals, it is 0x3FFF_FFFF_FFFF_FFFF.

Example

real a = NaN(1_000_000);
assert(isNaN(a));
writeln(getNaNPayload(a)); // 1_000_000

Authors

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

License

Boost License 1.0.