source: doc/papers/concurrency/examples/Fib2.cfa@ da09ba1

//
// Cforall Version 1.0.0 Copyright (C) 2018 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// fibonacci_1.cfa -- 1-state finite-state machine: precomputed first two states returning f(n - 1)
//
// Author           : Peter A. Buhr
// Created On       : Thu Apr 26 23:20:08 2018
// Last Modified By : Peter A. Buhr
// Last Modified On : Fri Mar 22 17:26:41 2019
// Update Count     : 28
// 

#include <fstream.hfa>
#include <coroutine.hfa>

coroutine Fibonacci { int fn1; };                                               // used for communication

void main( Fibonacci & fib ) with( fib ) {                              // called on first resume
        int fn;
        [fn1, fn] = [0, 1];                                                                     // precompute first two states
        for () {
                suspend();                                                                              // restart last resume
                [fn1, fn] = [fn, fn1 + fn];                                             // general case
        } // for
}

int ?()( Fibonacci & fib ) with( fib ) {                                // function call operator
        resume( fib );                                                                          // restart last suspend
        return fn1;
}

int main() {
        Fibonacci f1, f2;
        for ( 10 ) {                                                                            // print N Fibonacci values
                sout | f1() | f2();
        } // for
}

// Local Variables: //
// tab-width: 4 //
// compile-command: "cfa fibonacci_1.cfa" //
// End: //