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- // bll_and_function.cpp - The Boost Lambda Library -----------------------
- //
- // Copyright (C) 2000-2003 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
- // Copyright (C) 2000-2003 Gary Powell (powellg@amazon.com)
- //
- // 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)
- //
- // For more information, see www.boost.org
- // test using BLL and boost::function
- #include <boost/test/minimal.hpp> // see "Header Implementation Option"
- #include "boost/lambda/lambda.hpp"
- #include "boost/function.hpp"
- #include <vector>
- #include <map>
- #include <set>
- #include <string>
- using namespace boost::lambda;
- using namespace std;
- void test_function() {
- boost::function<int (int, int)> f;
- f = _1 + _2;
- BOOST_CHECK(f(1, 2)== 3);
- int i=1; int j=2;
- boost::function<int& (int&, int)> g = _1 += _2;
- g(i, j);
- BOOST_CHECK(i==3);
- int* sum = new int();
- *sum = 0;
- boost::function<int& (int)> counter = *sum += _1;
- counter(5); // ok, sum* = 5;
- BOOST_CHECK(*sum == 5);
- delete sum;
-
- // The next statement would lead to a dangling reference
- // counter(3); // error, *sum does not exist anymore
- }
- int test_main(int, char *[]) {
- test_function();
- return 0;
- }
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