RestoreOutputStreamState.h

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/*
 * Distributed under the OpenDDS License.
 * See: http://www.opendds.org/license.html
 */

#ifndef OPENDDS_DCPS_RESTORE_OUTPUT_STREAM_STATE_H
#define OPENDDS_DCPS_RESTORE_OUTPUT_STREAM_STATE_H

// This file is used by opendds_idl, so it must be relative.
#include "../Versioned_Namespace.h"

#include <ostream>

OPENDDS_BEGIN_VERSIONED_NAMESPACE_DECL

namespace OpenDDS {
namespace DCPS {

/**
 * Save and automatically restore various formatting properties of a
 * std::ostream. This should be used in custom operator<< overload functions
 * when changing these properties.
 */
class RestoreOutputStreamState {
public:
  explicit RestoreOutputStreamState(std::ostream& stream)
    : stream_(stream)
    , saved_(0)
  {
    saved_.copyfmt(stream);
  }

  ~RestoreOutputStreamState()
  {
    stream_.copyfmt(saved_);
  }

private:
  std::ostream& stream_;
  std::ios saved_;
};

} // namespace DCPS
} // namespace OpenDDS

OPENDDS_END_VERSIONED_NAMESPACE_DECL

#endif /* OPENDDS_DCPS_RESTORE_OUTPUT_STREAM_STATE_H */