Nested try…catch inside C++ exception handler?

Question

The code I want to execute in my exception handler may itself throw an exception.

Is the follow structure legal C++? If yes, are there any downsides?

Answer 1

It's a perfectly valid way to code.

#include 
using namespace std;



int main(int argc, char* argv[])
{
        try       //outer try{}
        {
                try   //inner try{}
                {
                    throw std::runtime_error("Demo");
                }
                catch (std::runtime_error& e)
                {
                    std::cerr << "Inner Exception-Handler: " << e.what() << std::endl;
                    throw;
                }
        }
        catch (std::exception& e)
        {
            std::cerr << "Outer Exception-Handler: " << e.what() << std::endl;
        }

    return 0;
}