//
// Cforall Version 1.0.0 Copyright (C) 2017 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// fibonacci.c -- 3-state finite-state machine

//
// Author           : Thierry Delisle
// Created On       : Thu Jun  8 07:29:37 2017
// Last Modified By : Peter A. Buhr
// Last Modified On : Fri Apr 27 08:55:31 2018
// Update Count     : 19
//

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

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

void main( Fibonacci & fib ) with( fib ) {				// called on first resume
	int fn1, fn2;										// retained between resumes
	fn = 0;  fn1 = fn;									// 1st case
	suspend();											// restart last resume
	fn = 1;  fn2 = fn1;  fn1 = fn;						// 2nd case
	suspend();											// restart last resume
	for ( ;; ) {
		fn = fn1 + fn2;  fn2 = fn1;  fn1 = fn;			// general case
		suspend();										// restart last resume
	} // for
}

int next( Fibonacci & fib ) with( fib ) {
	resume( fib );										// restart last suspend
	return fn;
}

int main() {
	Fibonacci f1, f2;
	for ( int i = 1; i <= 10; i += 1 ) {
		sout | next( f1 ) | next( f2 ) | endl;
	} // for
}

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