`rethrow`

Raises an exception again, usually from inside a catch block.

Category: Programming > Programming Utilities

Syntax

rethrow(ME)

Throws the exception ME with its original identifier and message.

rethrow(errStruct)

Throws an error described by a structure with message and identifier fields.

Description

A catch block that handles part of a problem, such as releasing a resource, can pass the error on to its caller with rethrow(ME) instead of hiding it. The caller then sees the original identifier and message.

Input arguments

ME: An MException object.
errStruct: Structure with at least the fields message and identifier.

Example

Cleaning up, then passing the error on

try
    try
        error('io:fail', 'disk error')
    catch inner
        disp('cleaning up')
        rethrow(inner)
    end
catch outer
    disp(outer.identifier)
end

Output

cleaning up
io:fail

rethrow