Question

In my app Im using different open source libraries , that throws different exceptions .
I don’t have experience in dealing in way with exception handling ,I always just did the try/catch thing , when I know
there is problem .
Now I like to build some kind of object that handles all exceptions inside it . and I don’t have idea how to start and even if it possible
For example I have my class A and B

Class A 
{
 void method1() 
{
  Foo foo = new foo // external lib throws throw std::bad_alloc();
}
};

Class B 
{
 Void method1() 
{
  Int d = m_foo[0] // external lib  throw std::runtime_error( message );
}
};

I want somehow to handle those kinds and others in central place in my application
What strategy should I use ?

UPDATE :
after trying the suggestion offered and implemented the try/catch in the main of my application , the problem it never gets there when the exception throws all im getting is this but its never gets to the try/catch:

Answer 1

You can use a try... catch structure in your main() function. All exceptions of the C++ standard library derive from std::exception, so that’s a good back up. However, you should discriminate all different kinds of exceptions, or at least, those more common. You can also create your own exceptions, as classes deriving from std::runtime_error. You can have multiple catch sections, but ordered from the one more specific to the more general one.

try {

// more things...

}
catch(const std::bad_alloc &ba)
{
    // memory error
    std::cerr << "Memory error" << std::endl;
    exit( EXIT_FAILURE );
}
catch(const std::runtime_error &re)
{
    // customized error, probably
    std::cerr << "ERROR: " << re.what() << std::endl;
    exit( EXIT_FAILURE );
}
catch(const std::exception &e)
{
    // general (unexpected) error
    std::cerr << "Unexpected ERROR: " << e.what() << std::endl;
    exit( EXIT_FAILURE );
}

Remember you need to #include stdexcept and exception.
Hope this helps.