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std::basic_streambuf<CharT,Traits>::pubseekpos, std::basic_streambuf<CharT,Traits>::seekpos

pos_type pubseekpos( pos_type pos,
                     std::ios_base::openmode which = std::ios_base::in | std::ios_base::out );
 (1) 
protected:
virtual pos_type seekpos( pos_type pos,
                          std::ios_base::openmode which = std::ios_base::in | std::ios_base::out);
 (2)

Sets the position indicator of the input and/or output sequence to an absolute position.

1) Calls seekpos(pos, 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 absolute positioning of the position indicator.

Parameters

pos - absolute position to set the position indicator to.
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

Return value

1) The return value of seekpos(pos, which)
2) The resulting absolute position as defined by the position indicator. The base class version returns pos_type(off_type(-1)).

Example

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 55 C++98 the base class version of seekpos returned
an undefined invalid stream position 		returns pos_type(off_type(-1))

See also

invokes seekoff()
(public member function)
[virtual]
 repositions the file position, using absolute addressing
(virtual protected member function of std::basic_filebuf<CharT,Traits>)
[virtual]
 repositions the next pointer in the input sequence, output sequence, or both using absolute addressing
(virtual protected member function of std::basic_stringbuf<CharT,Traits,Allocator>)
[virtual]
 repositions the next pointer in the input sequence, output sequence, or both using absolute addressing
(virtual protected member function of std::strstreambuf)

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