Defining own exception class in C++

Question

I tried to figure out how to implement my own base class for C++ exceptions which allow adding an error specific text string. I see no possibility for the std::c++ exceptions to change the error text, even not in C++11: http://www.cplusplus.com/reference/exception/exception/. I also want to derive more specific exceptions from my Exception-base class. I read a lot of articles but I am still unsure whether my following implementation covers all important aspects.

class Exception : public std::exception {      
    public:
        Exception(const char* message) : m(message) {

        }

        virtual ~Exception() throw() {

        }

        virtual const char* what() const throw() {
            return m.c_str();
        }

    protected:
        std::string m;

    private:
        Exception();
    };

Is this implementation fine?

what problem you see? should be posted in codereview.stackexchange.com — Rakib
– Rakib, Commented Jun 10, 2014 at 8:47
I think what you are looking for is this : en.cppreference.com/w/cpp/error/runtime_error — Thomas Benard
– Thomas Benard, Commented Jun 10, 2014 at 8:53
Note alternatively, you may provide a std::string to std::runtime_error. — Jarod42
– Jarod42, Commented Jun 10, 2014 at 8:53

user657267 · Accepted Answer · 2014-06-10 08:54:26Z

3

If you derive from runtime_error (and your compiler supports inheriting constructors) you can condense your class to

struct Exception : public std::runtime_error
{
  using runtime_error::runtime_error;
};

throw(): Exception specifications are deprecated as of C++11, use noexcept instead.

answered Jun 10, 2014 at 8:54

user657267

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2 Comments

ComicSansMS Over a year ago

And what if you want to throw a logic_error from time to time?

ComicSansMS Over a year ago

My point is, for a generic Exception base class like requested by the question, it seems odd to suggest deriving from std::runtime_error, which only represents a small subset of the possible error cases. This could complicate writing reasonable catch statements on the user side later.

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