//CopyFrom copy from Book instance
CopyFrom copy from Book instance
// CopyFrom copy from Book instance
func (b *Book) CopyFrom(src *Book) *Book {
	if src == nil {
		return nil
	}
	if b == nil {
		return src
	}
	*b = *src
	return b
}
func ( b * Book ) CopyFrom ( src * Book ) * Book { if src == nil { return nil } if b == nil { return src } * b = * src return b }
CopyFrom copy from Book instance
CopyFrom copy from Book instance