die.cc

#include <cstdlib>
#include <iostream>

struct Die {
    template <typename T>
    operator T() {
        std::cout << "Die!!" << std::endl;
        std::exit(1);
    }
} die;

int main()
{
    int a = 0 or die;

    return 0;
}

$ g++ die.cc
$ ./a.out
Die!!
$ echo $?
1