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// 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
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