source: doc/theses/andrew_beach_MMath/code/cond-catch.cpp @ 12c1eef

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

using namespace std;
using namespace std::chrono;

struct EmptyException : public std::exception {};

bool should_catch = false;

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

        time_point<steady_clock> start_time = steady_clock::now();
    for (unsigned int count = 0 ; count < times ; ++count) {
        try {
                        try {
                                throw EmptyException();
                        } catch (EmptyException & exc) {
                                if (!should_catch) {
                                        throw;
                                }
                                asm volatile ("# catch block (conditional)");
                        }
                } catch (EmptyException &) {
                        asm volatile ("# catch block (unconditional)");
                }
    }
        time_point<steady_clock> end_time = steady_clock::now();
        nanoseconds duration = duration_cast<nanoseconds>(end_time - start_time);
        cout << "Run-Time (s): " << fixed << setprecision(1) << duration.count() / 1'000'000'000. << endl;
}