59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
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// Copyright (C) 2006-2009, 2012 Alexander Nasonov
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// Copyright (C) 2012 Lorenzo Caminiti
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// Distributed under the Boost Software License, Version 1.0
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// (see accompanying file LICENSE_1_0.txt or a copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// Home at http://www.boost.org/libs/scope_exit
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#include <boost/config.hpp>
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#ifdef BOOST_NO_CXX11_VARIADIC_MACROS
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# error "variadic macros required"
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#else
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#include <boost/scope_exit.hpp>
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#include <boost/typeof/typeof.hpp>
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#include <boost/typeof/std/vector.hpp>
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#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
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#include <boost/detail/lightweight_test.hpp>
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#include <vector>
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struct person {};
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BOOST_TYPEOF_REGISTER_TYPE(person)
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struct world {
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void add_person(person const& a_person);
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size_t population(void) const { return persons_.size(); }
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private:
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std::vector<person> persons_;
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};
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BOOST_TYPEOF_REGISTER_TYPE(world)
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//[world
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void world::add_person(person const& a_person) {
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bool commit = false;
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persons_.push_back(a_person); // (1) direct action
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// Following block is executed when the enclosing scope exits.
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BOOST_SCOPE_EXIT(&commit, &persons_) {
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if(!commit) persons_.pop_back(); // (2) rollback action
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} BOOST_SCOPE_EXIT_END
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// ... // (3) other operations
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commit = true; // (4) disable rollback actions
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}
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//]
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int main(void) {
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world w;
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person p;
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w.add_person(p);
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BOOST_TEST(w.population() == 1);
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return boost::report_errors();
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}
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#endif // variadic macros
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