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std::basic_stringbuf::seekpos

性病：基本[医]搜寻者：

protected: virtual pos_type seekpos(pos_type sp, std::ios_base::openmode which = std::ios_base::in | std::ios_base::out ​​

再定位std::basic_streambuf::gptr和/或std::basic_streambuf::pptr，如果可能的话，按照sp...

有效执行seekoff(off_type(sp),std::ios_base::beg, which)...

参数

sp-stream position, such as one obtained by seekoff() or seekpos()
which-defines whether the input sequences, the output sequence, or both are affected. It can be one or a combination of the following constants: Constant Explanation in affect the input sequence out affect the output sequence
ConstantExplanation
inaffect the input sequence
outaffect the output sequence

返回值

sp关于成功或pos_type(off_type(-1))在失败的时候。

注记

seekpos()被std::basic_streambuf::pubseekpos()的单参数版本调用std::basic_istream::seekg()和std::basic_ostream::seekp()...

例

二次

#include <sstream>
#include <iostream>
 
struct mybuf : std::stringbuf
{
    mybuf(const std::string& str) : std::stringbuf(str) {}
    pos_type seekpos(pos_type sp, std::ios_base::openmode which) {
         std::cout << "Before seekpos(" << sp << "), size of the get area is "
                   << egptr()-eback() << " with "
                   << egptr()-gptr() << " read positions available\n";
         pos_type rc = std::stringbuf::seekpos(sp, which
         std::cout << "seekpos() returns " << rc << ".\nAfter the call, "
                   << "size of the get area is "
                   << egptr()-eback() << " with "
                   << egptr()-gptr() << " read positions available\n";
        return rc;
    }
};
 
int main()
{
    mybuf buf("12345"
    std::iostream stream(&buf
    stream.seekg(2
}

二次

产出：

二次

Before seekpos(2), size of the get area is 5 with 5 read positions available
seekpos() returns 2.
After the call, size of the get area is 5 with 3 read positions available

二次

另见

pubseekposinvokes seekpos() (public member function of std::basic_streambuf)
seekoff virtualrepositions the next pointer in the input sequence, output sequence, or both, using relative addressing (virtual protected member function)
seekpos virtualrepositions the file position, using absolute addressing (virtual protected member function of std::basic_filebuf)
seekpos virtualrepositions 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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