![]() ![]() In terms of static initialization order, cin is guaranteed to be properly constructed and initialized no later than the first time an object of type ios_base::Init is constructed, with the inclusion of counting as at least one initialization of such objects with static duration.Ĭin is tied to the standard output stream cout (see ios::tie), which indicates that cout's buffer is flushed (see ostream::flush) before each i/o operation performed on cin.īy default, cin is synchronized with stdin (see ios_base::sync_with_stdio).Ī program should not mix input operations on cin with input operations on wcin (or with other wide-oriented input operations on stdin): Once an input operation has been performed on either, the standard input stream acquires an orientation (either narrow or wide) that can only be safely changed by calling freopen on stdin.įor more information on the operations supported by cin, see the reference for its type: istream. The iostream: This class is responsible for handling both input and output stream as both istream class and o stream class is inherited into it.
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