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      //===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <strstream>
// class ostrstream
// strstreambuf* rdbuf() const;
#include <strstream>
#include <cassert>
#include "test_macros.h"
int main(int, char**)
{
    {
        char buf[] = "123 4.5 dog";
        const std::ostrstream out(buf, 0);
        std::strstreambuf* sb = out.rdbuf();
        assert(sb->sputc('a') == 'a');
        assert(buf == std::string("a23 4.5 dog"));
    }
  return 0;
}
 
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