Exceptions: Difference between revisions

 

This task is to give an example of an exception handling routine and to "throw" a new exception.

===Define an exception===

Foo_Error : Exception;

-- do something

end Call_Foo;

===try===

try

}

 

'''Compiler''': MSVS 2005

 

}

 

Forth's exception mechanism is, like most things in Forth, very simple but powerful.

CATCH captures the data and return stack pointers, then exectutes an execution token.

10 ['] myfun catch if drop then

 

===Define Exceptions===

exception MyException;

val y = f() handle MyDataException x => x;

 

 

===Throwing exceptions===

}

 

 

# throw an exception

See http://perldoc.perl.org/perlvar.html#%24EVAL_ERROR for the meaning of the special variable <tt>$@</tt>. See http://search.cpan.org/dist/Error for an advanced, object based exception handling.

 

 

'''Interpreter''': PHP 5.0+

}

 

 

===Throwing exceptions===

</pre>

 

 

===try-except-finally-else===

quux()

 

 

42 as custom_error