// 
// 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 -- 
// 
// Author           : Thierry Delisle
// Created On       : Thu Jun  8 07:29:37 2017
// Last Modified By : Peter A. Buhr
// Last Modified On : Thu Jun  8 07:37:12 2017
// Update Count     : 5
// 

#include <fstream>
#include <coroutine>

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

void ?{}( Fibonacci * this ) {
	this->fn = 0;
}

void main( Fibonacci * this ) {
	int fn1, fn2;					// retained between resumes
	this->fn = 0;					// case 0
	fn1 = this->fn;
	suspend();						// return to last resume

	this->fn = 1;					// case 1
	fn2 = fn1;
	fn1 = this->fn;
	suspend();						// return to last resume

	for ( ;; ) {					// general case
		this->fn = fn1 + fn2;
		fn2 = fn1;
		fn1 = this->fn;
		suspend();					// return to last resume
	} // for
}

int next( Fibonacci * this ) {
	resume( this );					// transfer to last suspend
	return this->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: //