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_VARIADIC_MACROS
11# error "variadic macros required"
12#else
13
14#include <boost/scope_exit.hpp>
15#include <boost/typeof/typeof.hpp>
16#include <boost/typeof/std/vector.hpp>
17#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
18#include <boost/detail/lightweight_test.hpp>
19#include <vector>
20
21struct person {};
22BOOST_TYPEOF_REGISTER_TYPE(person)
23
24struct world {
25 void add_person(person const& a_person);
26 size_t population(void) const { return persons_.size(); }
27
28private:
29 std::vector<person> persons_;
30};
31BOOST_TYPEOF_REGISTER_TYPE(world)
32
33//[world
34void world::add_person(person const& a_person) {
35 bool commit = false;
36
37 persons_.push_back(x: a_person); // (1) direct action
38 // Following block is executed when the enclosing scope exits.
39 BOOST_SCOPE_EXIT(&commit, &persons_) {
40 if(!commit) persons_.pop_back(); // (2) rollback action
41 } BOOST_SCOPE_EXIT_END
42
43 // ... // (3) other operations
44
45 commit = true; // (4) disable rollback actions
46}
47//]
48
49int main(void) {
50 world w;
51 person p;
52 w.add_person(a_person: p);
53 BOOST_TEST(w.population() == 1);
54 return boost::report_errors();
55}
56
57#endif // variadic macros
58
59

source code of boost/libs/scope_exit/test/world.cpp