// Copyright (C) 2001-2003// William E. Kempf//// Distributed under the Boost Software License, Version 1.0. (See accompanying// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)#include <boost/thread/thread.hpp>#include <boost/ref.hpp>#include <iostream>class factorial{public:factorial(int x) : x(x), res(0) { }void operator()() { res = calculate(x); }int result() const { return res; }private:int calculate(int x) { return x <= 1 ? 1 : x * calculate(x-1); }private:int x;int res;};int main(){factorial f(10);boost::thread thrd(boost::ref(f));thrd.join();std::cout << "10! = " << f.result() << std::endl;}
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