Boost C++ Application Development Cookbook - Second Edition

How to do it...

C++ uses the RAII pattern instead of try {} finally{} construction. The Boost.ScopeExit library was designed to allow user definition of RAII wrappers right in the function body:

#include <boost/scope_exit.hpp> #include <cstdlib> #include <cstdio> #include <cassert> int main() {     std::FILE* f = std::fopen("example_file.txt", "w");     assert(f);     BOOST_SCOPE_EXIT(f) {     // Whatever happened in outer scope, this code will be executed     // and file will be correctly closed.         std::fclose(f);     } BOOST_SCOPE_EXIT_END     // Some code that may throw or return.     // ... }