Re: Exceptions Class...
On 2011-01-31 14:38, TheGunslinger wrote:
I am trying to understand exception classes in C++.
From the point of language rules, basically any time can be used as exception type. But most projects I'm aware of attempt to follow what the standard library does, see below.
By comparison, JAVA offers a generic exceptions class.
I am unable to find a similar class in C++?
C++ does not enforce user-code in that strong way as Java does, but the Standard library always creates exception objects that are derived from std::exception.
Is this because it doesn't exist?
The Standard library provides a collection of exception classes, starting from std::exception. But this class does not allow you to provide a message string, so I recommend to use either of std::logic_error, std::runtime_error, or one of their derivatives as your actual exception type.
What little I have found in my reference texts suggests that the
programmer writes his own exceptions class specific to the type of
exceptions expected within the program.
This makes often sense, nevertheless this exception should be derived from std::exception to make it easier for users of your code to intuitively handle exceptions from you.
As such, every programmer has to re-invent the wheel by re-writing an
exceptions class for personal use or for each program?
No.
HTH & Greetings from Bremen,
Daniel Kr?gler
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