Advanced C++ Programming Cookbook

How it works...

Creating your own C++ exceptions allows you to filter out what type of exception you are getting. For example, did the exception come from your code or the C++ library? By creating your own C++ exceptions, you can easily answer these questions during runtime in your own code. Let's look at the following example:

#include <iostream>#include <stdexcept>class the_answer : public std::exception{public:    the_answer() = default;    const char *what() const noexcept    {        return "The answer is: 42";    }};int main(void){    try {        throw the_answer{};    }    catch (const std::exception &e) {        std::cout << e.what() << '\n';    }}

As shown in the preceding example, we create our own C++ exception by inheriting std::exception. This is not a requirement. Technically, ...