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/config.hpp>
9#ifdef BOOST_NO_CXX11_VARIADIC_MACROS
10# error "variadic macros required"
11#else
12
13#include <boost/local_function.hpp>
14#include <boost/typeof/typeof.hpp>
15#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
16#include <boost/detail/lightweight_test.hpp>
17#include <vector>
18#include <algorithm>
19
20struct adder;
21BOOST_TYPEOF_REGISTER_TYPE(adder) // Register before `bind this_` below.
22
23//[add_this
24struct adder {
25 adder() : sum_(0) {}
26
27 int sum(const std::vector<int>& nums, const int factor = 10) {
28
29 void BOOST_LOCAL_FUNCTION(const bind factor, bind this_, int num) {
30 this_->sum_ += factor * num; // Use `this_` instead of `this`.
31 } BOOST_LOCAL_FUNCTION_NAME(add)
32
33 std::for_each(first: nums.begin(), last: nums.end(), f: add);
34 return sum_;
35 }
36
37private:
38 int sum_;
39};
40//]
41
42int main(void) {
43 std::vector<int> v(3);
44 v[0] = 1; v[1] = 2; v[2] = 3;
45
46 BOOST_TEST(adder().sum(v) == 60);
47 return boost::report_errors();
48}
49
50#endif // VARIADIC_MACROS
51
52

source code of boost/libs/local_function/test/add_this.cpp