Difference between basic_istream<>::tellg() and basic_ostream<>::tellp() [closed]

问题

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Closed 6 years ago.

I was just wondering why the member functions tellg() defined in basic_istream<> class and tellp() defined in basic_ostream<> class have different names. Is that because basic_fstream<> is derived from basic_istream<> and basic_ostream<> ?

回答1:

And how would you distinguish them in bidirectional streams, like std::fstream or std::stringstream? Streams are allowed to maintain separate pointers for input and output: fstream doesn't, but stringstream does. So you need either a flag to indicate which one you want (as is the case in streambuf), or you need two separate functions.

回答2:

tellg() get the position of the get pointer and tellp() gets the position of the put pointer, one of them is the place where you read and the second- where you write in the file. So the two functions do different things and return different values. Why would you think they should have the same name?

来源：https://stackoverflow.com/questions/14522122/difference-between-basic-istreamtellg-and-basic-ostreamtellp