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The standard object cin is an object of this type. A simple way to solve that is to add an auxilliary std::ifstream (a true object and not a ref) into the class and declare it before input_stream to be able to initialize input_stream with it. Input stream objects can read and interpret input from sequences of characters. To to have it refere a file stream, that damned file stream shall exist somewhere, and potentially different FlagParser objects could have different streams. In the last recipe, we learned how we can assemble compound data structures from an input stream and then. There is no problem with std::cin which is a well known object defined by the standard library. Filling containers from std::istream iterators. include/std/streambuf (basicstreambuf): Do not default copy constructor and assignment on first declaration. traits Character traits class that defines essential properties of the characters used by stream objects.

istream Parameters. It is possible, but requires cautious programming.Īs input_stream has to be a reference, it must refere to an existing object. std::basicistream< CharT, Traits >::sentry - Performs setup work for input streams. std::basiciostream The class template basiciostream provides support for high level input/output operations on streams.