code review 874041: cmath pkg

src/pkg/cmath/isinf.go

+// 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 cmath
+
+import "math"
+
+// IsInf(x) returns true if either real(x) or imag(x) is an infinity.
+func IsInf(x complex128) bool {
+        // TODO(rsc) remove inlining whem compiler does it for us

[rsc1, 2010/04/02 07:13:53]

Not worth it in this one:

return math.IsInf(real(x), 0) || math.IsInf(imag(x), 0)

+        if real(x) < -math.MaxFloat64 || real(x) > math.MaxFloat64 || imag(x) < -math.MaxFloat64 || imag(x) > math.MaxFloat64 { // if math.IsInf(real(x), 0) || math.IsInf(imag(x), 0) {
+                return true
+        }
+        return false
+}
+
+// Inf() returns a complex infinity.

[rsc1, 2010/04/02 07:13:53]

// Inf returns a complex infinity, cmplx(+Inf, +Inf).

+func Inf() complex128 {
+        inf := math.Inf(1)
+        return cmplx(inf, inf)
+}