package errorx type ErrorCode int const ( GENERAL_ERR ErrorCode = iota NOT_FOUND ) var NotFoundErr = NewWithCode(NOT_FOUND, "not found") type Error struct { msg string code ErrorCode } func New(message string) *Error { return &Error{message, GENERAL_ERR} } func NewWithCode(code ErrorCode, message string) *Error { return &Error{message, code} } func (e *Error) Error() string { return e.msg } func (e *Error) Code() ErrorCode { return e.code }