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 <boost/config.hpp> 15 #include <vector> 16 17 struct person {}; 18 BOOST_TYPEOF_REGISTER_TYPE(person) 19 20 struct world { 21 void add_person(person const& a_person); populationworld22 size_t population(void) const { return persons_.size(); } 23 24 private: 25 std::vector<person> persons_; 26 }; BOOST_TYPEOF_REGISTER_TYPE(world)27BOOST_TYPEOF_REGISTER_TYPE(world) 28 29 void world::add_person(person const& a_person) { 30 bool commit = false; 31 32 persons_.push_back(a_person); 33 BOOST_SCOPE_EXIT( (&commit) (this_) ) { 34 if(!commit) this_->persons_.pop_back(); 35 } BOOST_SCOPE_EXIT_END 36 37 // ... 38 39 commit = true; 40 } 41 main(void)42int main(void) { 43 world w; 44 person p; 45 w.add_person(p); 46 BOOST_TEST(w.population() == 1); 47 return boost::report_errors(); 48 } 49 50