This week, we're updating our course layouts and descriptions. Presentation and materials always gently change over time, but just occasionally there's a need to make a step change to clear out some of the old and roll in the new. That's now happening - but over a long and complex site it's not instant and you'll see sections of the site changing up to and including 19th September.
See also [here] for status update
Throwing your own exception in C++, and catching it
In C++ you can throw anything - it doesn't have to be something "throw-able" as in Java.
1. Create a class of objects that you want to throw in exceptional circumstances
2. When you want to throw an exception, use the throw
keyword and pass in the object
3. Call the code that you want to catch the exception in a try
4. Add catch
blocks after the try
block to handle the exceptions.
Full example, with comments, [here]
There's a program using string
objects - here - that shows how some of the C++ system classes throw exceptions ...
92:antrim graham$ ./prob
Please enter your details I am Graham Ellis and I am in Belfast at present
terminate called after throwing an instance of 'std::out_of_range'
And here is a similar program but with an added exception handler:
92:antrim graham$ ./except
Please enter your details This is a further demonstration for you
Caught exception basic_string::erase
We could go on if we wanted
Although in this demo we'll exit nice
for the failing code and [here]
for the fixed code. (written 2010-11-24, updated 2010-12-04)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesC236 - C and C based languages - Exceptions 
Operator Overloading, Exceptions, Pointers, References and Templates in C++ - new examples from our courses - (2011-11-06) 
Handling unusual and error conditions - exceptions - (2010-02-03) 
What are exceptions - Python based answer - (2008-11-08) 
The case for exceptions - (2006-07-11)
Some other Articles
Finding elements common to many lists / arraysWell House Price list, January to March 2011Belfast, on a cold November eveningStrings, Garbage Collection and Variable Scope in C++Throwing your own exception in C++, and catching itUsing C and C++ functions in the same program - how to do itSeparating groups of variables into namespacesPictures from the Birkenhead to Belfast crossingOn the way to the course this weekComments in and on Perl - a case for extreme OO programming
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