text: //===----------------------------------------------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  // <sstream>
  
  // template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
  // class basic_ostringstream
  
  // void swap(basic_ostringstream& rhs);
  
  #include <sstream>
  #include <cassert>
  
  int main(int, char**)
  {
      {
          std::ostringstream ss0(" 123 456");
          std::ostringstream ss;
          swap(ss, ss0);
          assert(ss.rdbuf() != 0);
          assert(ss.good());
          assert(ss.str() == " 123 456");
          int i = 234;
          ss << i << ' ' << 567;
          assert(ss.str() == "234 5676");
          ss0 << i << ' ' << 567;
          assert(ss0.str() == "234 567");
      }
      {
          std::wostringstream ss0(L" 123 456");
          std::wostringstream ss;
          swap(ss, ss0);
          assert(ss.rdbuf() != 0);
          assert(ss.good());
          assert(ss.str() == L" 123 456");
          int i = 234;
          ss << i << ' ' << 567;
          assert(ss.str() == L"234 5676");
          ss0 << i << ' ' << 567;
          assert(ss0.str() == L"234 567");
      }
  
    return 0;
  }
  