27.stringbuf.seekoff.stdcxx-295.cpp

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#include <cassert>
#include <sstream>
 
int main()
{
    std::istringstream in;
    std::ostringstream out;
    std::stringstream inout;
 
    // DR453:
    // http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#453
    //
    // changes 27.7.1.3, p10 (seekoff, called by tellg() and tellp())
    // to read:
    //
    // For a sequence to be positioned, if its next pointer (either
    // gptr() or pptr()) is a null pointer and the new offset newoff
    // is nonzero, the positioning operation fails.
 
    assert (0 == in.tellg ());
    assert (0 == out.tellp ());
    assert (0 == inout.tellg ());
    assert (0 == inout.tellp ());
 
#ifndef _RWSTD_NO_WCHAR_T
 
    std::wistringstream win;
    std::wostringstream wout;
    std::wstringstream winout;
 
    assert (0 == win.tellg ());
    assert (0 == wout.tellp ());
    assert (0 == winout.tellg ());
    assert (0 == winout.tellp ());
 
#endif   // _RWSTD_NO_WCHAR_T
 
}