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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../io/streamoff.html below:

std::streamoff - cppreference.com

typedef /*implementation-defined*/ streamoff;

The type std::streamoff is an implementation-defined signed integral(since C++11) type of sufficient size to represent the maximum possible file size supported by the operating system. Typically, this is an alias for long long.(since C++11)

It is used to represent offsets from stream positions (values of type std::fpos). A std::streamoff value constructed from -1 is also used to represent error conditions by some of the I/O library functions.

[edit] Relationship with std::fpos

the difference between two std::fpos objects is a value of type std::streamoff

a value of type std::streamoff may be added or subtracted from std::fpos yielding a different std::fpos.

a value of type std::fpos is implicitly convertible to std::streamoff (the conversion result is the offset from the beginning of the file).

a value of type std::fpos is constructible from a value of type std::streamoff

[edit] See also represents absolute position in a stream or a file
(class template) [edit] sets the input position indicator
(public member function of std::basic_istream<CharT,Traits>) [edit] sets the output position indicator
(public member function of std::basic_ostream<CharT,Traits>) [edit]

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