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1 
2 // Copyright (C) 2006-2009, 2012 Alexander Nasonov
3 // Copyright (C) 2012 Lorenzo Caminiti
4 // Distributed under the Boost Software License, Version 1.0
5 // (see accompanying file LICENSE_1_0.txt or a copy at
6 // http://www.boost.org/LICENSE_1_0.txt)
7 // Home at http://www.boost.org/libs/scope_exit
8 
9 #include <boost/config.hpp>
10 #ifdef BOOST_NO_CXX11_LAMBDAS
11 #   error "lambda functions required"
12 #else
13 
14 #include <boost/detail/lightweight_test.hpp>
15 #include <vector>
16 
17 struct person {};
18 
19 struct world {
20     void add_person(person const& a_person);
21     std::vector<person> persons_;
22 };
23 
24 //[world_cxx11_lambda
25 #include <functional>
26 
27 struct scope_exit {
scope_exitscope_exit28     scope_exit(std::function<void (void)> f) : f_(f) {}
~scope_exitscope_exit29     ~scope_exit(void) { f_(); }
30 private:
31     std::function<void (void)> f_;
32 };
33 
add_person(person const & a_person)34 void world::add_person(person const& a_person) {
35     bool commit = false;
36 
37     persons_.push_back(a_person);
38     scope_exit on_exit1([&commit, this](void) { // Use C++11 lambda.
39         if(!commit) persons_.pop_back(); // `persons_` via captured `this`.
40     });
41 
42     // ...
43 
44     commit = true;
45 }
46 //]
47 
main(void)48 int main(void) {
49     world w;
50     person p;
51     w.add_person(p);
52     BOOST_TEST(w.persons_.size() == 1);
53     return boost::report_errors();
54 }
55 
56 #endif // LAMBDAS
57 
58