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/local_function.hpp>
9 #include <boost/typeof/typeof.hpp>
10 #include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
11 #include <boost/detail/lightweight_test.hpp>
12 #include <algorithm>
13 #include <vector>
14 
15 struct calculator;
16 BOOST_TYPEOF_REGISTER_TYPE(calculator) // Register before `bind this_` below.
17 
18 struct calculator {
19     std::vector<int> results;
20 
factorialscalculator21     void factorials(const std::vector<int>& nums) {
22         int BOOST_LOCAL_FUNCTION( (bind this_) (int num)
23                 (bool recursion)(default false) ) {
24             int result = 0;
25 
26             if(num <= 0) result = 1;
27             else result = num * factorial(num - 1, true);
28 
29             if(!recursion) this_->results.push_back(result);
30             return result;
31         } BOOST_LOCAL_FUNCTION_NAME(recursive factorial)
32 
33         std::for_each(nums.begin(), nums.end(), factorial);
34     }
35 };
36 
main(void)37 int main(void) {
38     std::vector<int> v(3);
39     v[0] = 1; v[1] = 3; v[2] = 4;
40 
41     calculator calc;
42     calc.factorials(v);
43     BOOST_TEST(calc.results[0] == 1);
44     BOOST_TEST(calc.results[1] == 6);
45     BOOST_TEST(calc.results[2] == 24);
46     return boost::report_errors();
47 }
48 
49