1 // bll_and_function.cpp - The Boost Lambda Library -----------------------
2 //
3 // Copyright (C) 2000-2003 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
4 // Copyright (C) 2000-2003 Gary Powell (powellg@amazon.com)
5 //
6 // Distributed under the Boost Software License, Version 1.0. (See
7 // accompanying file LICENSE_1_0.txt or copy at
8 // http://www.boost.org/LICENSE_1_0.txt)
9 //
10 // For more information, see www.boost.org
11
12 // test using BLL and boost::function
13
14 #include <boost/test/minimal.hpp> // see "Header Implementation Option"
15
16 #include "boost/lambda/lambda.hpp"
17
18 #include "boost/function.hpp"
19
20 #include <vector>
21 #include <map>
22 #include <set>
23 #include <string>
24
25
26 using namespace boost::lambda;
27
28 using namespace std;
29
test_function()30 void test_function() {
31
32 boost::function<int (int, int)> f;
33 f = _1 + _2;
34
35 BOOST_CHECK(f(1, 2)== 3);
36
37 int i=1; int j=2;
38 boost::function<int& (int&, int)> g = _1 += _2;
39 g(i, j);
40 BOOST_CHECK(i==3);
41
42
43
44 int* sum = new int();
45 *sum = 0;
46 boost::function<int& (int)> counter = *sum += _1;
47 counter(5); // ok, sum* = 5;
48 BOOST_CHECK(*sum == 5);
49 delete sum;
50
51 // The next statement would lead to a dangling reference
52 // counter(3); // error, *sum does not exist anymore
53
54 }
55
56
test_main(int,char * [])57 int test_main(int, char *[]) {
58
59 test_function();
60
61 return 0;
62 }
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