For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.
Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!
I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
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 
The case for exceptions - (2006-07-11) 
What are exceptions - Python based answer - (2008-11-08) 
Handling unusual and error conditions - exceptions - (2010-02-03) 
Operator Overloading, Exceptions, Pointers, References and Templates in C++ - new examples from our courses - (2011-11-06)
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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This is a page archived from The Horse's Mouth at
the diary and writings of Graham Ellis.
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page was written, but things do move forward in our business - new software
releases, price changes, new techniques. Please check back via
our main site for current courses,
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