1 // Copyright 2017, 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.md file.
12 // IsZero reports whether v is the zero value.
13 // This does not rely on Interface and so can be used on unexported fields.
14 func IsZero(v reflect.Value) bool {
17 return v.Bool() == false
18 case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
20 case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
22 case reflect.Float32, reflect.Float64:
23 return math.Float64bits(v.Float()) == 0
24 case reflect.Complex64, reflect.Complex128:
25 return math.Float64bits(real(v.Complex())) == 0 && math.Float64bits(imag(v.Complex())) == 0
27 return v.String() == ""
28 case reflect.UnsafePointer:
29 return v.Pointer() == 0
30 case reflect.Chan, reflect.Func, reflect.Interface, reflect.Ptr, reflect.Map, reflect.Slice:
33 for i := 0; i < v.Len(); i++ {
34 if !IsZero(v.Index(i)) {
40 for i := 0; i < v.NumField(); i++ {
41 if !IsZero(v.Field(i)) {