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Source file src/math/nextafter.go

Documentation: math

  // 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
  }
  

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