text: //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  // <streambuf>
  
  // template <class charT, class traits = char_traits<charT> >
  // class basic_streambuf;
  
  // int_type snextc();
  
  #include <streambuf>
  #include <cassert>
  
  int uflow_called = 0;
  
  struct test
      : public std::basic_streambuf<char>
  {
      typedef std::basic_streambuf<char> base;
  
      test() {}
  
      void setg(char* gbeg, char* gnext, char* gend)
      {
          base::setg(gbeg, gnext, gend);
      }
  
  protected:
      int_type uflow()
      {
          ++uflow_called;
          return 'a';
      }
  };
  
  int main()
  {
      {
          test t;
          assert(uflow_called == 0);
          assert(t.snextc() == -1);
          assert(uflow_called == 1);
          char in[] = "ABC";
          t.setg(in, in, in+sizeof(in));
          assert(t.snextc() == 'B');
          assert(uflow_called == 1);
          assert(t.snextc() == 'C');
          assert(uflow_called == 1);
      }
  }
  