basic_istream<> :: tellg()和basic_ostream<> :: tellp()之间的差异 [英] Difference between basic_istream<>::tellg() and basic_ostream<>::tellp()

问题描述

我只是想知道为什么basic_istream<>类中定义的成员函数tellg()和basic_ostream<>类中定义的tellp()具有不同的名称.那是因为basic_fstream<>是从basic_istream<>和basic_ostream<>派生的吗?

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<> ?

推荐答案

以及如何在双向流中区分它们， 例如std::fstream或std::stringstream?允许流 维护输入和输出的单独指针:fstream 不会，但是stringstream会.所以你需要一个标志 指出您想要的那个(例如streambuf)，或者 您需要两个单独的功能.

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.

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