27.stringbuf.xsputn.stdcxx-576.cpp

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#include <sstream>  // for stringbuf
#include <string>   // for string
#include <cassert>  // for assert()
 
struct PubBuf: std::stringbuf
{
    char* Pbase () const { return this->pbase (); }
};
 
int main ()
{
    // 512 is the default buffer size of the basic_stringbuf
    std::string s (512, 'a');
 
    std::stringbuf sbuf (s);
    PubBuf& buf = (PubBuf&)sbuf;
 
    std::streamsize res = buf.sputn (buf.Pbase (), 128);
    s.append (s.begin (), s.begin () + 128);
 
    const std::string& str = buf.str ();
 
    assert (res == 128);
    assert (str.size () == s.size ());
    assert (str == s);
 
    return 0;
}