/
empty.go
31 lines (29 loc) · 905 Bytes
/
empty.go
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package obj
import "reflect"
// The missing definition of 'reflect.IsZero' you've always wanted.
func isEmptyValue(v reflect.Value) bool {
switch v.Kind() {
case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
return v.Len() == 0
case reflect.Bool:
return !v.Bool()
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.Interface, reflect.Ptr:
return v.IsNil()
case reflect.Struct:
// Note: we can't rely on a *literal* "is zero" check because
// non-zero pointers may still point to *empty* things.
for i := 0; i < v.NumField(); i++ {
if !isEmptyValue(v.Field(i)) {
return false
}
}
return true
}
return false
}