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 
19 struct number;
20 BOOST_TYPEOF_REGISTER_TYPE(number) // Register before `bind this_` below.
21 
22 struct number {
numbernumber23     number(int value) : value_(value) {}
24 
incnumber25     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 
32 private:
33     int value_;
34 };
35 
main(void)36 int 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