| 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/config.hpp> |
| 10 | #ifdef BOOST_NO_CXX11_LAMBDAS |
| 11 | # error "lambda functions required" |
| 12 | #else |
| 13 | |
| 14 | #include <boost/detail/lightweight_test.hpp> |
| 15 | #include <vector> |
| 16 | |
| 17 | struct person {}; |
| 18 | |
| 19 | struct world { |
| 20 | void add_person(person const& a_person); |
| 21 | std::vector<person> persons_; |
| 22 | }; |
| 23 | |
| 24 | //[world_cxx11_lambda |
| 25 | #include <functional> |
| 26 | |
| 27 | struct scope_exit { |
| 28 | scope_exit(std::function<void (void)> f) : f_(f) {} |
| 29 | ~scope_exit(void) { f_(); } |
| 30 | private: |
| 31 | std::function<void (void)> f_; |
| 32 | }; |
| 33 | |
| 34 | void world::add_person(person const& a_person) { |
| 35 | bool commit = false; |
| 36 | |
| 37 | persons_.push_back(x: a_person); |
| 38 | scope_exit on_exit1([&commit, this](void) { // Use C++11 lambda. |
| 39 | if(!commit) persons_.pop_back(); // `persons_` via captured `this`. |
| 40 | }); |
| 41 | |
| 42 | // ... |
| 43 | |
| 44 | commit = true; |
| 45 | } |
| 46 | //] |
| 47 | |
| 48 | int main(void) { |
| 49 | world w; |
| 50 | person p; |
| 51 | w.add_person(a_person: p); |
| 52 | BOOST_TEST(w.persons_.size() == 1); |
| 53 | return boost::report_errors(); |
| 54 | } |
| 55 | |
| 56 | #endif // LAMBDAS |
| 57 | |
| 58 |