| 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_VARIADIC_MACROS |
| 11 | # error "variadic macros required" |
| 12 | #else |
| 13 | |
| 14 | #include <boost/scope_exit.hpp> |
| 15 | #include <boost/typeof/std/string.hpp> |
| 16 | #include <boost/typeof/std/map.hpp> |
| 17 | #include <map> |
| 18 | #include <string> |
| 19 | #include <utility> |
| 20 | |
| 21 | int main(void) { |
| 22 | //[scope_guard_decl |
| 23 | bool commit = false; |
| 24 | std::string currency("EUR"); |
| 25 | double rate = 1.3326; |
| 26 | std::map<std::string, double> rates; |
| 27 | bool currency_rate_inserted = |
| 28 | rates.insert(x: std::make_pair(x&: currency, y&: rate)).second; |
| 29 | // Transaction... |
| 30 | //] |
| 31 | |
| 32 | //[scope_guard_exit |
| 33 | BOOST_SCOPE_EXIT(currency_rate_inserted, &commit, &rates, ¤cy) { |
| 34 | if(currency_rate_inserted && !commit) rates.erase(x: currency); |
| 35 | } BOOST_SCOPE_EXIT_END |
| 36 | |
| 37 | // ... |
| 38 | |
| 39 | commit = true; |
| 40 | //] |
| 41 | |
| 42 | return 0; |
| 43 | } |
| 44 | |
| 45 | #endif // variadic macros |
| 46 | |
| 47 |