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- // Copyright 2017, 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.md file.
-
- package value
-
- import "reflect"
-
- // IsZero reports whether v is the zero value.
- // This does not rely on Interface and so can be used on unexported fields.
- func IsZero(v reflect.Value) bool {
- switch v.Kind() {
- case reflect.Bool:
- return v.Bool() == false
- case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
- return v.Int() == 0
- case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
- return v.Uint() == 0
- case reflect.Float32, reflect.Float64:
- return v.Float() == 0
- case reflect.Complex64, reflect.Complex128:
- return v.Complex() == 0
- case reflect.String:
- return v.String() == ""
- case reflect.UnsafePointer:
- return v.Pointer() == 0
- case reflect.Chan, reflect.Func, reflect.Interface, reflect.Ptr, reflect.Map, reflect.Slice:
- return v.IsNil()
- case reflect.Array:
- for i := 0; i < v.Len(); i++ {
- if !IsZero(v.Index(i)) {
- return false
- }
- }
- return true
- case reflect.Struct:
- for i := 0; i < v.NumField(); i++ {
- if !IsZero(v.Field(i)) {
- return false
- }
- }
- return true
- }
- return false
- }
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