CODEWITHSUNDEEP
c++c++11
Minimus Heximus
Minimus Heximus

Reputation: 2815

`tellp` and `tellg` when file is opened in and out

With

fstream file("test.txt",ios_base::in | ios_base::out | ios_base::binary);

are tellp and tellg the same for file? Or seekp and seekg?

Upvotes: 1

Views: 749

Answers (1)

Cubbi
Cubbi

Reputation: 47438

Yes, std::filebuf, the buffer used by std::fstream, has only one pointer. seekg and seekp move the same pointer, and tellg and tellp return its position.

(an example of a stream where the pointers are different is std::stringstream)

The standard specifies this in §27.9.1.1[filebuf]/3

A joint file position is maintained for both the input sequence and the output sequence

Upvotes: 3

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