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Function `std.math.nextDown`

Calculate the next smallest floating point value before x.


						
				real nextDown
				(
				

				  real x
				

				) pure nothrow @nogc @safe;
				

				

				double nextDown
				(
				

				  double x
				

				) pure nothrow @nogc @safe;
				

				

				float nextDown
				(
				

				  float x
				

				) pure nothrow @nogc @safe;

Return the greatest number less than x that is representable as a real; thus, it gives the previous point on the IEEE number line.

Special Values
x	nextDown(x)
∞	real.max
±0.0	-real.min_normal*real.epsilon
-real.max	-∞
-∞	-∞
NAN	NAN

Example

writeln(nextDown(1.0 + real.epsilon)); // 1.0

Authors

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

License

Boost License 1.0.