Boost C++ Libraries

The header <boost/core/fclose_deleter.hpp> defines the boost::fclose_deleter function object, which can be used as a deleter with smart pointers such as unique_ptr or shared_ptr pointing to std::FILE. structures returned by std::fopen calls. The deleter calls std::fclose on the passed pointer, causing the file stream to be flushed and closed.

std::unique_ptr< std::FILE, boost::fclose_deleter > make_file(const char* filename, const char* open_mode)
{
    return { std::fopen(filename, open_mode) };
}