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In this noncompliant code example, a std::fstream object f file is constructed. The constructor for std::fstream calls std::basic_filebuf<T>::open(), and the default std::terminate_handler called by std::terminate() is std::abort(), which does not call destructors. Consequently, the underlying std::basic_filebuf<T> object maintained by the object is not properly closed, and the program has no way of determining whether an error occurs while flushing or closing the file.
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#include <exception> #include <fstream> #include <string> void f(const std::string &NfileName) { std::fstream ffile(NfileName); if (!ffile.is_open()) { // Handle error return; } // ... std::terminate(); } |
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#include <exception> #include <fstream> #include <string> void f(const std::string &NfileName) { std::fstream ffile(NfileName); if (!ffile.is_open()) { // Handle error return; } // ... ffile.close(); if (ffile.fail()) { // Handle error } std::terminate(); } |
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