source: doc/papers/concurrency/examples/Fib3.cc @ 8315947

#include <cstdio>

struct Fib {
        int fn = 1, fn1 = 0;
        void * next = nullptr;

        int operator()() {
                if ( __builtin_expect(next != 0, 1) ) goto *next;
                next = &&s1;
                for ( ;; ) {
                        return fn1;
                  s1: ;
                        int fn0 = fn + fn1;
                        fn1 = fn;
                        fn = fn0;
                        return fn1;
                }
        }
};
int main() {
        Fib f1, f2;
        for ( int i = 0; i < 10; i += 1 ) {
                printf( "%d %d\n", f1(), f2() );
        }
}

// Local Variables: //
// tab-width: 4 //
// compile-command: "gcc-8 Fib3.cc" //
// End: //