1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
// Copyright (C) 2009-2012 Lorenzo Caminiti
// Distributed under the Boost Software License, Version 1.0
// (see accompanying file LICENSE_1_0.txt or a copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Home at http://www.boost.org/libs/local_function
#include <boost/config.hpp>
#ifdef BOOST_NO_CXX11_VARIADIC_MACROS
# error "variadic macros required"
#else
#include <boost/local_function.hpp>
#include <boost/function.hpp>
#include <boost/typeof/std/string.hpp>
#include <boost/detail/lightweight_test.hpp>
#include <string>
boost::function<void (const std::string&)> set;
boost::function<const std::string& (void)> get;
void action(void) {
// State `message` hidden behind access functions from here.
BOOST_TEST(get() == "abc");
set("xyz");
BOOST_TEST(get() == "xyz");
}
int main(void) {
std::string message = "abc"; // Reference valid where closure used.
void BOOST_LOCAL_FUNCTION(bind& message, const std::string& text) {
message = text;
} BOOST_LOCAL_FUNCTION_NAME(s)
set = s;
const std::string& BOOST_LOCAL_FUNCTION(const bind& message) {
return message;
} BOOST_LOCAL_FUNCTION_NAME(g)
get = g;
action();
return boost::report_errors();
}
#endif // VARIADIC_MACROS
|
