std::basic_ostream::seekp

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`basic_ostream& seekp( pos_type pos );`	(1)
`basic_ostream& seekp( off_type off, std::ios_base::seekdir dir);`	(2)

streambuf .

-, sentry , () ' . ( C++11) ,

1)

( ) pos rdbuf()->pubseekoff(pos, std::ios_base::out). (pos_type)-1 , setstate(failbit).

2)

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

pos

.

off

.

dir

, . :



beg
end
cur

*this

1)

std::ios_base::failure , exceptions() & failbit != 0.

2)

, rdbuf()->pubseekoff()

#include <sstream>
#include <iostream>

int main()
{
    std::ostringstream os("hello, world");
    os.seekp(7);
    os << 'W';
    os.seekp(0, std::ios_base::end);
    os << '!';
    os.seekp(0);
    os << 'H';
    std::cout << os.str() << '\n';
}

:

Hello, World!

.

tellp	(public -) []
tellg	(public - `std::basic_istream`) []
seekg	(public - `std::basic_istream`) []







(C++20)

(C++20)
(C++11)





(C++20)


/

(C++11)
(C++11)
(C++11)
(C++17)

/
print (C++23)
/ C

basic_streambuf
basic_filebuf
basic_stringbuf
basic_spanbuf (C++23)
strstreambuf ( C++98)
basic_syncbuf (C++20)


ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
/
basic_ifstream
basic_ofstream
basic_fstream
/
basic_istringstream
basic_ostringstream
basic_stringstream
/
basic_ispanstream (C++23)
basic_ospanstream (C++23)
basic_spanstream (C++23)
istrstream ( C++98)
ostrstream ( C++98)
strstream ( C++98)

basic_osyncstream (C++20)

streamoff
streamsize
fpos

iostream_category (C++11)
io_errc (C++11)

cppreference.com

std::basic_ostream::seekp

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