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std::basic_ostream::seekp

性病：基本[医]Ostream：：Sekp

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

设置当前关联的输出位置指示符。streambuf对象。

Behaves as UnformattedOutputFunction (except without actually performing output). After constructing and checking the sentry object,(since C++11)

1%29将输出位置指示符设置为相对于文件%29值开头的绝对%28。pos打电话rdbuf()->pubseekpos(pos,std::ios_base::out).如果呼叫返回(pos_type)-1，执行setstate(failbit)...

2%29将输出位置指示器设置为偏移。off相对于dir打电话rdbuf()->pubseekoff(off, dir,std::ios_base::out)...

Does not report errors.(until C++14)
If the call returns (pos_type)-1, executes setstate(failbit).(since C++14)

参数

pos-absolute position to set the output position indicator to.
off-relative position 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
ConstantExplanation
begthe beginning of a stream
endthe ending of a stream
curthe current position of stream position indicator

返回值

*this...

例外

1%5月29日投掷std::ios_base::failure如果失败，如果exceptions() & failbit != 0...

2%29

Does not throw unless rdbuf()->pubseekoff() throws(until C++14)
May throw std::ios_base::failure in case of failure, if exceptions() & failbit != 0.(since C++14)

例

二次

#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';
}

二次

产出：

二次

Hello, World!

二次

另见

tellpreturns the output position indicator (public member function)
tellgreturns the input position indicator (public member function of std::basic_istream)
seekgsets the input position indicator (public member function of std::basic_istream)

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