27.stringbuf.members.stdcxx-427.cpp

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#include <cassert>
#include <cstdio>
#include <sstream>
 
int main ()
{
    struct Buf: std::stringbuf {
        Buf (std::string s, std::ios::openmode m)
            : std::stringbuf (s, m) { }
 
        void setget (int beg, int cur, int end) {
            setg (eback () + beg, eback () + cur, eback () + end);
        }
 
        void setput (int beg, int cur, int end) {
            setp (pbase () + beg, pbase () + end);
            pbump (cur);
        }
    };
 
    {
        Buf buf ("abcde", std::ios::in);
        buf.setget (1, 2, 4);
        std::printf ("%s\n", buf.str ().c_str ());
        assert ("bcd" == buf.str ());
    }
    {
        Buf buf ("abcde", std::ios::out);
        buf.setput (1, 2, 4);
        std::printf ("%s\n", buf.str ().c_str ());
        assert ("bcde" == buf.str ());
    }
    {
        Buf buf ("abcde", std::ios::openmode ());
        std::printf ("%s\n", buf.str ().c_str ());
        assert ("" == buf.str ());
    }
}