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

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