/usr/share/go-1.6/src/math/copysign.go is in golang-1.6-src 1.6.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | // Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package math
// Copysign returns a value with the magnitude
// of x and the sign of y.
func Copysign(x, y float64) float64 {
const sign = 1 << 63
return Float64frombits(Float64bits(x)&^sign | Float64bits(y)&sign)
}
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