//
// Cforall Version 1.0.0 Copyright (C) 2019 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// suspend_then.cfa --
//
// Author           : Peter A. Buhr
// Created On       : Mon Apr 29 12:01:35 2019
// Last Modified By : Peter A. Buhr
// Last Modified On : Thu Jun 10 21:55:51 2021
// Update Count     : 1
//

#include <fstream.hfa>

generator Fibonacci {
	int fn1, fn2;								// retained between resumes
	int fn;									// used for communication
};

void main( Fibonacci & fib ) with( fib ) {				// called on first resume
	fn = 0;  fn1 = fn;							// 1st case
	suspend { sout | "Then!"; }						// restart last resume
	fn = 1;  fn2 = fn1;  fn1 = fn;					// 2nd case
	suspend { sout | "Then!"; }						// restart last resume
	for () {
		fn = fn1 + fn2;  fn2 = fn1;  fn1 = fn;			// general case
		suspend { sout | "Then!"; }					// restart last resume
	} // for
}

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

int main() {
	Fibonacci f1, f2;
	for ( 10 ) {								// print N Fibonacci values
		int v1 = next( f1 );
		int v2 = next( f2 );
		sout | v1 | v2;
	} // for
}

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