// 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 // Nextafter32 returns the next representable float32 value after x towards y. // // Special cases are: // // Nextafter32(x, x) = x // Nextafter32(NaN, y) = NaN // Nextafter32(x, NaN) = NaN func Nextafter32(x, y float32) (r float32) { switch { case IsNaN(float64(x)) || IsNaN(float64(y)): // special case r = float32(NaN()) case x == y: r = x case x == 0: r = float32(Copysign(float64(Float32frombits(1)), float64(y))) case (y > x) == (x > 0): r = Float32frombits(Float32bits(x) + 1) default: r = Float32frombits(Float32bits(x) - 1) } return } // Nextafter returns the next representable float64 value after x towards y. // // Special cases are: // // Nextafter(x, x) = x // Nextafter(NaN, y) = NaN // Nextafter(x, NaN) = NaN func Nextafter(x, y float64) (r float64) { switch { case IsNaN(x) || IsNaN(y): // special case r = NaN() case x == y: r = x case x == 0: r = Copysign(Float64frombits(1), y) case (y > x) == (x > 0): r = Float64frombits(Float64bits(x) + 1) default: r = Float64frombits(Float64bits(x) - 1) } return }