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Function std.math.NaN
Create a quiet , storing an integer inside the payload.
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.
Prototype
real NaN( ulong payload ) pure nothrow @nogc @trusted;
Authors
Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw