source: doc/theses/andrew_beach_MMath/code/cond-match.cpp@ cf444b6

// Conditional Match (or Re-Raise)
#include <exception>
#include <cstdlib>

struct EmptyException : public std::exception {};

bool should_catch = false;

void throw_exception() {
        throw EmptyException();
}

void cond_catch() {
        try {
                throw_exception();
        } catch (EmptyException & exc) {
                if (should_catch) {
                        throw;
                }
        }
}

int main(int argc, char * argv[]) {
        unsigned int times = 1;
        unsigned int total_frames = 1;
        if (2 < argc) {
                times = strtol(argv[1], nullptr, 10);
        }
        if (3 < argc) {
                total_frames = strtol(argv[2], nullptr, 10);
        }

    for (unsigned int count = 0 ; count < times ; ++count) {
        try {
                        cond_catch();
                } catch (EmptyException &) {
                        // ...
                }
    }
}