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Showing content from http://en.cppreference.com/w/cpp/io/basic_streambuf/../basic_filebuf/../basic_ostream/seekp.html below:

std::basic_ostream<CharT,Traits>::seekp - cppreference.com

basic_ostream& seekp( pos_type pos );

(1) (2)

Sets the output position indicator of the current associated streambuf object.

Behaves as UnformattedOutputFunction (except without actually performing output). After constructing and checking the sentry object,

(since C++11) 1)

if

fail() != true

, sets the output position indicator to absolute (relative to the beginning of the file) value

pos

by calling

rdbuf()->pubseekpos(pos, std::ios_base::out)

. In case of failure, calls

setstate(std::ios_base::failbit)

.

2)

if

fail() != true

, sets the output position indicator to offset

off

relative to

dir

by calling

rdbuf()->pubseekoff(off, dir, std::ios_base::out)

. In case of failure, calls

setstate(std::ios_base::failbit)

.

[edit] Parameters pos - absolute position to set the output position indicator to off - relative position (positive or negative) to set the output 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 [edit] Return value

*this

[edit] Exceptions [edit] Example [edit] 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 129 C++98 there was no way to indicate a failure sets failbit on failure LWG 136 C++98 seekp could set the input stream only sets the output stream LWG 537 C++98 1. the type of pos was pos_type&
2. the type of off was off_type& 1. corrected to pos_type
2. corrected to off_type LWG 2341 C++98 the resolution of LWG issue 129 for overload (2) was removed restored [edit] See also returns the output position indicator
(public member function) [edit] returns the input position indicator
(public member function of std::basic_istream<CharT,Traits>) [edit] sets the input position indicator
(public member function of std::basic_istream<CharT,Traits>) [edit]

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