source: doc/theses/andrew_beach_MMath/code/throw-detor.cfa@ 5ad24a2c

// Throw Across Destructor
#include <clock.hfa>
#include <exception.hfa>
#include <fstream.hfa>
#include <stdlib.hfa>                                                                   // strto

exception empty_exception;
vtable(empty_exception) empty_vt;

struct WithDestructor {};

void ^?{}(WithDestructor & this) {
        asm volatile ("# destructor body");
}

void unwind_destructor(unsigned int frames) {
        if (frames) {
                WithDestructor object;
                unwind_destructor(frames - 1);
        } else {
                throw (empty_exception){&empty_vt};
        }
}

int main(int argc, char * argv[]) {
        unsigned int times = 1;
        unsigned int total_frames = 1;
        if (1 < argc) {
                times = strto(argv[1], 0p, 10);
        }
        if (2 < argc) {
                total_frames = strto(argv[2], 0p, 10);
        }

        Time start_time = timeHiRes();
        for (int count = 0 ; count < times ; ++count) {
                try {
                        unwind_destructor(total_frames);
                } catch (empty_exception *) {
                        asm volatile ("# catch block");
                }
        }
        Time end_time = timeHiRes();
        sout | "Run-Time (s): " | wd(0,1, (end_time - start_time)`ns / 1_000_000_000.);
}