Question

If I just simply use throw some_string; then I get terminate called after throwing an instance of 'std::string'. How can I get some printout with the string value actually shown, for example, terminate called after throwing 'This is wrong', or something similar?

Thank you.

Answer 1

Generally, you should be throwing subclasses of std::exception. Most C++ implementations automatically print out the result of calling exception::what() if the exception is uncaught.

#include <stdexcept>

int main()
{
    throw std::runtime_error("This is wrong");
}

With GCC, this outputs:

terminate called after throwing an instance of 'std::runtime_error'
  what():  This is wrong
Aborted