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/function.hpp>
15#include <boost/typeof/typeof.hpp>
16#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
17#include <boost/detail/lightweight_test.hpp>
18
19struct number;
20BOOST_TYPEOF_REGISTER_TYPE(number) // Register before `bind this_` below.
21
22struct number {
23 number(int value) : value_(value) {}
24
25 boost::function<int (void)> inc(void) {
26 int BOOST_LOCAL_FUNCTION(bind this_) {
27 return ++this_->value_;
28 } BOOST_LOCAL_FUNCTION_NAME(i)
29 return i;
30 }
31
32private:
33 int value_;
34};
35
36int main(void) {
37 number n1 = 0; // Object valid in scope where closure is used.
38 boost::function<int (void)> inc1 = n1.inc();
39 number n2 = 0;
40 boost::function<int (void)> inc2 = n2.inc();
41
42 BOOST_TEST(inc1() == 1);
43 BOOST_TEST(inc1() == 2);
44 BOOST_TEST(inc2() == 1);
45 BOOST_TEST(inc1() == 3);
46 return boost::report_errors();
47}
48
49#endif // VARIADIC_MACROS
50
51

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