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Library/boost/libs/lambda/test/bll_and_function.cpp
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PatoFlamejanteTV
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19 дек 2024, 19:11
19 дек 2024, 19:11
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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; }