Question

Please tell me how to use try/catch properly with boost::exception.

This is one of examples

void Settings::init(const std::string &filename)
{
    using boost::property_tree::ptree;
    try 
    {
        read_xml(filename, pt);
    }
    catch(boost::exception const&  ex)
    {
        LOG_FATAL("Can't init settings. %s", /* here is the question */);
    }
}

Do I need catch std::exception too?
I can’t let my application fail, so I just need to log everything.

UPD:
I also can’t understand now to retrive information for logging from exception???

Answer 1

std::exception has a member function called what() that returns a const char* that might explain what happened. If you want to log it (guessing that LOG_FATAL wraps printf somehow) you can do:

catch(std::exception const&  ex)
{
    LOG_FATAL("Can't init settings. %s", ex.what());
}

For boost::exception though you can use boost::get_error_info to find out more about it.