1 
2 // Copyright (C) 2009-2012 Lorenzo Caminiti
3 // Distributed under the Boost Software License, Version 1.0
4 // (see accompanying file LICENSE_1_0.txt or a copy at
5 // http://www.boost.org/LICENSE_1_0.txt)
6 // Home at http://www.boost.org/libs/local_function
7 
8 #include <boost/detail/lightweight_test.hpp>
9 
10 //[add_local_functor
main(void)11 int main(void) {
12     int sum = 0, factor = 10;
13 
14     struct local_add { // Unfortunately, boilerplate code to program the class.
15         local_add(int& _sum, int _factor): sum(_sum), factor(_factor) {}
16 
17         inline void operator()(int num) { // Body uses C++ statement syntax.
18             sum += factor * num;
19         }
20 
21     private: // Unfortunately, cannot bind so repeat variable types.
22         int& sum; // Access `sum` by reference.
23         const int factor; // Make `factor` constant.
24     } add(sum, factor);
25 
26     add(1);
27     int nums[] = {2, 3};
28     // Unfortunately, cannot pass as template parameter to `std::for_each`.
29     for(size_t i = 0; i < 2; ++i) add(nums[i]);
30 
31     BOOST_TEST(sum == 60);
32     return boost::report_errors();
33 }
34 //]
35 
36