NAME¶

std::streamoff - std::streamoff

Synopsis¶

Defined in header <ios>
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.

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

See also¶

fpos represents absolute position in a stream or a file
(class template)
seekg sets the input position indicator
(public member function of std::basic_istream<CharT,Traits>)
seekp sets the output position indicator
(public member function of std::basic_ostream<CharT,Traits>)