codekingpro/portable-devtools

1// Copyright 2010 The Go Authors. All rights reserved.2// Use of this source code is governed by a BSD-style3// license that can be found in the LICENSE file.4 5package math6 7// Copysign returns a value with the magnitude of f8// and the sign of sign.9func Copysign(f, sign float64) float64 {10	const signBit = 1 << 6311	return Float64frombits(Float64bits(f)&^signBit | Float64bits(sign)&signBit)12}13