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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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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 block and
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'
  what(): basic_string::erase
Abort trap
92:antrim graham$

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
92:antrim graham$

See [here] 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 articles
C236 - C and C based languages - Exceptions
  [799] The case for exceptions - (2006-07-11)
  [1875] What are exceptions - Python based answer - (2008-11-08)
  [2622] Handling unusual and error conditions - exceptions - (2010-02-03)
  [3509] Operator Overloading, Exceptions, Pointers, References and Templates in C++ - new examples from our courses - (2011-11-06)

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Finding elements common to many lists / arrays
Well House Price list, January to March 2011
Belfast, on a cold November evening
Strings, Garbage Collection and Variable Scope in C++
Throwing your own exception in C++, and catching it
Using C and C++ functions in the same program - how to do it
Separating groups of variables into namespaces
Pictures from the Birkenhead to Belfast crossing
On the way to the course this week
Comments 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 http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the 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, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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