Exception Handling in CPP

The concept of exception handling is very simple. The basic idea is simply to raise an error flag when something goes wrong. Next, there is a system which always lookout for these error flag. finally, previous system calls an error handling code if a error flag is spotted.

Program Flow Raising an imaginary error flag is called throwing up an error. When the error is been thrown overall system will respond by catching an error. Surrounding the block of the error-sensitive code with an exception handling is called trying to execute the block of code.

The most powerful features of the exception handling is, an error can be thrown over the function boundaries. Means that if one of a deepest functions on a stack has error, this can be propagate to a upper function if there is the trying-block of a code there. This will allow the programmers to put an error handling code in a place, like the main-function of the program.

C++ exception handling

Designers of the C++ programming language, extended the language with the exception handling structures. Commands which are used relate closely to the terms used in the exception handling (as described above). Block of code which you want to try out starts by specifying a "try" command and surrounding a block with the curly braces. Inside this block, you are allowed to throw the occurring errors with a "throw" command. You should specify the error and this must be a class. After a try-block is been closed, a catch-block will start. This is illustrated in the code below.

try
{
     ...
     ...
     throw Exception()
     ...
     ...
}
catch( Exception e )
{
     ...
     ...
}

Here the exception is the defined class with the constructor with no parameters been passed. It will be useful to have the info on what type of error has occurred. This can be done by two methods. Either can define the different exception-classes and then throw them according to the error been occurred. Or can give a class parameter containing error message and allow a class to display the message.

Exception Handling System

A class which we are about to design should have to store the information about an error which occurred and a class should be able to display the error message. Following code shows this functionality.

class CException
{
     public:
     char* message;
     CException( char* m ) {
     message = m
};
     Report();
}

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