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Library/boost/libs/scope_exit/example/scope_guard.cpp
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19 дек 2024, 19:11
19 дек 2024, 19:11
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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/std/string.hpp> #include <boost/typeof/std/map.hpp> #include <map> #include <string> #include <utility> int main(void) { //[scope_guard_decl bool commit = false; std::string currency("EUR"); double rate = 1.3326; std::map<std::string, double> rates; bool currency_rate_inserted = rates.insert(std::make_pair(currency, rate)).second; // Transaction... //] //[scope_guard_exit BOOST_SCOPE_EXIT(currency_rate_inserted, &commit, &rates, ¤cy) { if(currency_rate_inserted && !commit) rates.erase(currency); } BOOST_SCOPE_EXIT_END // ... commit = true; //] return 0; } #endif // variadic macros