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-rw-r--r--src/math/cmplx/isinf.go21
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+// 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 cmplx
+
+import "math"
+
+// IsInf reports whether either real(x) or imag(x) is an infinity.
+func IsInf(x complex128) bool {
+ if math.IsInf(real(x), 0) || math.IsInf(imag(x), 0) {
+ return true
+ }
+ return false
+}
+
+// Inf returns a complex infinity, complex(+Inf, +Inf).
+func Inf() complex128 {
+ inf := math.Inf(1)
+ return complex(inf, inf)
+}