"Writing exception-safe code in C++ is fundamentally about writing try and catch in the correct places." Discuss.

Question

e.mccormick · Answer

Well, what do you know about exception handling and the try and catch system?

anonymous · Answer

I understand that exception handling is a way of processing or handling synchronous error, such as bad allocation, invalid parameter, and other error that occur during the execution of the normal flow of a program. So i want to know more about it.

e.mccormick · Answer

Basically it means this:

Try to do some command.  If the command fails, do this instead!

Here is a more detailed example of using this:

Lets say you want user input.  You need an floating point number.  But the person types a letter.  This would cause a bad assignment and crash the program.  Rather than let this happen, you do a try-catch sequence and change any errors into a new request to the user or some sort of help message.

Another good use is to do a try-catch around file IO.  Lets say you want to open a file to write.  However, what if the system has marked the file as in use or read only?  By doing a try-catch, you can detect the failed opening of the file and tell the software to look for reasons for the failure.