Cause cause from error to ecode.

Equal equal a and b by code int.

EqualError equal error.

Error returns a ecode.Codes and register associated ecode message NOTE: Error codes and messages should be kept together.

Int parse code int to error.

New new a ecode.Codes by int value.

Register register ecode message map.

String parse code string to error.

TopCode returns the first Code object if any code type error in err's chain Otherwise, returns CodeNotFoundErr.

Codes ecode error interface which has a code & message.

A Code is an int error code spec.