std::basic_streambuf::pubseekoff, std::basic_streambuf::seekoff

 

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Technical Specifications

 

Input/output library

I/O manipulators

C-style I/O

Buffers

basic_streambuf

basic_filebuf

basic_stringbuf

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basic_syncbuf (C++20)

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ios_base

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basic_stringstream

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istrstream (deprecated in C++98)

ostrstream (deprecated in C++98)

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Synchronized Output

basic_osyncstream (C++20)

Types

streamoff

streamsize

fpos

Error category interface

iostream_category (C++11)

io_errc (C++11)

 

std::basic_streambuf

Public member functions

basic_streambuf::~basic_streambuf

Locales

basic_streambuf::pubimbue

basic_streambuf::getloc

Positioning

basic_streambuf::pubsetbuf

basic_streambuf::pubseekoff

basic_streambuf::pubseekpos

basic_streambuf::pubsync

Get area

basic_streambuf::in_avail

basic_streambuf::snextc

basic_streambuf::sbumpc

basic_streambuf::sgetc

basic_streambuf::sgetn

Put area

basic_streambuf::sputc

basic_streambuf::sputn

Putback

basic_streambuf::sputbackc

basic_streambuf::sungetc

Protected member functions

basic_streambuf::basic_streambuf

basic_streambuf::operator= (C++11)

basic_streambuf::swap (C++11)

Locales

basic_streambuf::imbue

Positioning

basic_streambuf::setbuf

basic_streambuf::seekoff

basic_streambuf::seekpos

basic_streambuf::sync

Get area

basic_streambuf::showmanyc

basic_streambuf::underflow

basic_streambuf::uflow

basic_streambuf::xsgetn

basic_streambuf::ebackbasic_streambuf::gptrbasic_streambuf::egptr

basic_streambuf::gbump

basic_streambuf::setg

Put area

basic_streambuf::xsputn

basic_streambuf::overflow

basic_streambuf::pbasebasic_streambuf::pptrbasic_streambuf::epptr

basic_streambuf::pbump

basic_streambuf::setp

Putback

basic_streambuf::pbackfail

 

pos_type pubseekoff( off_type off, std::ios_base::seekdir dir,                      std::ios_base::openmode which = ios_base::in | ios_base::out );	(1)
protected: virtual pos_type seekoff( off_type off, std::ios_base::seekdir dir,                           std::ios_base::openmode which = ios_base::in | ios_base::out );	(2)

Sets the position indicator of the input and/or output sequence relative to some other position.

1) Calls seekoff(off, dir, which) of the most derived class

2) The base class version of this function has no effect. The derived classes may override this function to allow relative positioning of the position indicator.

Parameters

off	-	relative position to set the position indicator to.
dir	-	defines base position to apply the relative offset to. It can be one of the following constants: Constant Explanation beg the beginning of a stream end the ending of a stream cur the current position of stream position indicator
which	-	defines which of the input and/or output sequences to affect. It can be one or a combination of the following constants: Constant Explanation in affect the input sequence out affect the output sequence

Note

Not all combinations of parameters may be valid, see the derived versions of seekoff for details.

Return value

1) The return value of seekoff(off, dir, which)

2) The resulting absolute position as defined by the position indicator. The base class version returns pos_type(off_type(-1)).

See also

pubseekpos	invokes seekpos() (public member function)
seekoff [virtual]	repositions the file position, using relative addressing (virtual protected member function of std::basic_filebuf)
seekoff [virtual]	repositions the next pointer in the input sequence, output sequence, or both, using relative addressing (virtual protected member function of std::basic_stringbuf)
seekoff [virtual]	repositions the next pointer in the input sequence, output sequence, or both, using relative addressing (virtual protected member function of std::strstreambuf)