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zero.go
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zero.go
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// Package zero provides a zero check for arbitrary values.
package zero
import (
"reflect"
)
func isZero(v reflect.Value) bool {
if !v.IsValid() {
return true
}
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.Ptr, reflect.Interface:
return v.IsNil()
case reflect.Array:
for i := 0; i < v.Len(); i++ {
if !isZero(v.Index(i)) {
return false
}
}
return true
case reflect.Slice:
for i := 0; i < v.Len(); i++ {
if !isZero(v.Index(i)) {
return false
}
}
return true
case reflect.String, reflect.Map:
return v.Len() == 0
case reflect.Struct:
if v.NumField() == 0 {
return true
}
for i, n := 0, v.NumField(); i < n; i++ {
if isZero(v.Field(i)) {
return true
}
}
return false
// reflect.Chan, reflect.UnsafePointer, reflect.Func
default:
return v.IsNil()
}
}
// IsZero reports whether v is zero struct
// Does not support cycle pointers for performance, so as json
func IsZero(v interface{}) bool {
return isZero(reflect.ValueOf(v))
}