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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_INCREMENT_REGISTRATION_GROUP()
- #include <iostream>
- struct file {
- file(void) : open_(false) {}
- file(char const* path) : open_(false) { open(path); }
- void open(char const* path) { open_ = true; }
- void close(void) { open_ = false; }
- bool is_open(void) const { return open_; }
- private:
- bool open_;
- };
- BOOST_TYPEOF_REGISTER_TYPE(file)
- void bad(void) {
- //[try_catch_bad
- file passwd;
- try {
- passwd.open("/etc/passwd");
- // ...
- passwd.close();
- } catch(...) {
- std::clog << "could not get user info" << std::endl;
- if(passwd.is_open()) passwd.close();
- throw;
- }
- //]
- }
- void good(void) {
- //[try_catch_good
- try {
- file passwd("/etc/passwd");
- BOOST_SCOPE_EXIT(&passwd) {
- passwd.close();
- } BOOST_SCOPE_EXIT_END
- } catch(...) {
- std::clog << "could not get user info" << std::endl;
- throw;
- }
- //]
- }
- int main(void) {
- bad();
- good();
- return 0;
- }
- #endif // variadic macros
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