52 lines
1.0 KiB
Go
52 lines
1.0 KiB
Go
package reflect
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import (
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"errors"
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"reflect"
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)
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var (
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ErrInvalidStruct = errors.New("invalid struct specified")
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)
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func IsEmpty(v reflect.Value) bool {
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switch v.Kind() {
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case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
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return v.Len() == 0
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case reflect.Bool:
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return !v.Bool()
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return v.Int() == 0
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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return v.Uint() == 0
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case reflect.Float32, reflect.Float64:
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return v.Float() == 0
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case reflect.Interface, reflect.Ptr:
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if v.IsNil() {
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return true
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}
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return IsEmpty(v.Elem())
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case reflect.Func:
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return v.IsNil()
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case reflect.Invalid:
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return true
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}
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return false
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}
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func Zero(src interface{}) (interface{}, error) {
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sv := reflect.ValueOf(src)
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if sv.Kind() == reflect.Ptr {
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sv = sv.Elem()
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}
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if sv.Kind() == reflect.Invalid {
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return nil, ErrInvalidStruct
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}
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dst := reflect.New(sv.Type())
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return dst.Interface(), nil
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}
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