This doesn't look very minimal (as in minimal reproducible example) and it's also hard to understand what issues you have. The class templates of istream should be as. c++ csv stream Share Improve this question Follow edited at 18:36 asked at 16:35 Mohammad 129 8 You forgot the c++ tag. You could then decide to use it if it is an open stream, and use std::cin if it is not. The Istream used for header providing the standard input and combined input/output stream classes. In this example, cin sets the fail bit on the stream when it comes across non-numeric characters. Once the object is constructed, the call cin.tie returns &cout. 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. The object controls extractions from the standard input as a byte stream. To to have it refere a file stream, that damned file stream shall exist somewhere, and potentially different FlagParser objects could have different streams. Class templates The class templates of istream should be as follows Classes The classes of istram should be as follows. There is no problem with std::cin which is a well known object defined by the standard library. C++ Library - Previous Page Next Page Description The Istream used for header providing the standard input and combined input/output stream classes.It interfaces a file-based streambuffer ( std::basicfilebuf) with the high-level interface of ( std::basicistream ). It is possible, but requires cautious programming.Īs input_stream has to be a reference, it must refere to an existing object. std:: basicifstream C++ Input/output library std::basicifstream The class template basicifstream implements high-level input operations on file-based streams.
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