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std::streamoff is a signed integral type of sufficient size to represent the maximum possible file size supported by the operating system. Typically, this is a typedef to long long.
It is used to represent offsets from stream positions (values of type std::fpos). A
std::streamoff value of -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 results in the offset from the beginning of the file.
- a value of type std::fpos is constructible from a value of type std::streamoff
| represents absolute position in a stream or a file |