copysign

R copysign(R to, X from)
R copysign(X to, R from)
@trusted pure nothrow @nogc
R
copysign
(
R
X
)
(
X to
,
R from
)
if (
isIntegral!(X) &&
isFloatingPoint!(R)
)

Parameters

to X: the numeric value to use
from R: the sign value to use

Return Value

Type: R

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

Examples

assert(copysign(1.0, 1.0) == 1.0);
assert(copysign(1.0, -0.0) == -1.0);
assert(copysign(1UL, -1.0) == -1.0);
assert(copysign(-1.0, -1.0) == -1.0);

assert(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);

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std math traits functions