| 1 | // bll_and_function.cpp - The Boost Lambda Library ----------------------- |
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| 2 | // |
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| 3 | // Copyright (C) 2000-2003 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi) |
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| 4 | // Copyright (C) 2000-2003 Gary Powell (powellg@amazon.com) |
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| 5 | // |
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| 6 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 7 | // accompanying file LICENSE_1_0.txt or copy at |
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| 8 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 9 | // |
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| 10 | // For more information, see www.boost.org |
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| 11 | |
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| 12 | // test using BLL and boost::function |
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| 13 | |
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| 14 | #include <boost/core/lightweight_test.hpp> |
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| 15 | |
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| 16 | #include "boost/lambda/lambda.hpp" |
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| 17 | |
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| 18 | #include "boost/function.hpp" |
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| 19 | |
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| 20 | #include <vector> |
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| 21 | #include <map> |
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| 22 | #include <set> |
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| 23 | #include <string> |
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| 24 | |
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| 25 | |
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| 26 | using namespace boost::lambda; |
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| 27 | |
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| 28 | using namespace std; |
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| 29 | |
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| 30 | void test_function() { |
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| 31 | |
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| 32 | boost::function<int (int, int)> f; |
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| 33 | f = _1 + _2; |
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| 34 | |
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| 35 | BOOST_TEST_EQ(f(1, 2), 3); |
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| 36 | |
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| 37 | int i=1; int j=2; |
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| 38 | boost::function<int& (int&, int)> g = _1 += _2; |
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| 39 | g(i, j); |
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| 40 | BOOST_TEST_EQ(i, 3); |
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| 41 | |
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| 42 | |
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| 43 | |
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| 44 | int* sum = new int(); |
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| 45 | *sum = 0; |
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| 46 | boost::function<int& (int)> counter = *sum += _1; |
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| 47 | counter(5); // ok, sum* = 5; |
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| 48 | BOOST_TEST_EQ(*sum, 5); |
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| 49 | delete sum; |
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| 50 | |
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| 51 | // The next statement would lead to a dangling reference |
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| 52 | // counter(3); // error, *sum does not exist anymore |
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| 53 | |
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| 54 | } |
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| 55 | |
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| 56 | |
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| 57 | int main() |
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| 58 | { |
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| 59 | test_function(); |
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| 60 | |
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| 61 | return boost::report_errors(); |
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| 62 | } |
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| 63 | |
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