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Function `std.math.traits.copysign`


						
				R copysign(R, X)
				(
				

				  R to,
				

				  X from
				

				) pure nothrow @nogc @trusted
				

				if (isFloatingPoint!R && isFloatingPoint!X);
				

				

				R copysign(R, X)
				(
				

				  X to,
				

				  R from
				

				) pure nothrow @nogc @trusted
				

				if (isIntegral!X && isFloatingPoint!R);

Parameters

Name	Description
to	the numeric value to use
from	the sign value to use

Returns

a value composed of to with from's sign bit.

Example

writeln(copysign(1.0, 1.0)); // 1.0
writeln(copysign(1.0, -0.0)); // -1.0
writeln(copysign(1UL, -1.0)); // -1.0
writeln(copysign(-1.0, -1.0)); // -1.0

writeln(copysign(real.infinity, -1.0)); // -real.infinity
assert(copysign(real.nan, 1.0) is real.nan);
assert(copysign(-real.nan, 1.0) is real.nan);
assert(copysign(real.nan, -1.0) is -real.nan);

Authors

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

License

Boost License 1.0.