12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758 |
- // Copyright (C) 2006-2009, 2012 Alexander Nasonov
- // Copyright (C) 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/scope_exit
- #include <boost/config.hpp>
- #ifdef BOOST_NO_CXX11_VARIADIC_MACROS
- # error "variadic macros required"
- #else
- #include <boost/scope_exit.hpp>
- #include <boost/typeof/typeof.hpp>
- #include <boost/typeof/std/vector.hpp>
- #include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
- #include <boost/detail/lightweight_test.hpp>
- #include <vector>
- struct person {};
- BOOST_TYPEOF_REGISTER_TYPE(person)
- struct world {
- void add_person(person const& a_person);
- size_t population(void) const { return persons_.size(); }
- private:
- std::vector<person> persons_;
- };
- BOOST_TYPEOF_REGISTER_TYPE(world)
- //[world
- void world::add_person(person const& a_person) {
- bool commit = false;
- persons_.push_back(a_person); // (1) direct action
- // Following block is executed when the enclosing scope exits.
- BOOST_SCOPE_EXIT(&commit, &persons_) {
- if(!commit) persons_.pop_back(); // (2) rollback action
- } BOOST_SCOPE_EXIT_END
- // ... // (3) other operations
- commit = true; // (4) disable rollback actions
- }
- //]
- int main(void) {
- world w;
- person p;
- w.add_person(p);
- BOOST_TEST(w.population() == 1);
- return boost::report_errors();
- }
- #endif // variadic macros
|