libgo/go/math/cmplx/isinf.go

   1 // Copyright 2010 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package cmplx
   6
   7 import "math"
   8
   9 // IsInf returns true if either real(x) or imag(x) is an infinity.
  10 func IsInf(x complex128) bool {
  11         if math.IsInf(real(x), 0) || math.IsInf(imag(x), 0) {
  12                 return true
  13         }
  14         return false
  15 }
  16
  17 // Inf returns a complex infinity, complex(+Inf, +Inf).
  18 func Inf() complex128 {
  19         inf := math.Inf(1)
  20         return complex(inf, inf)
  21 }