ConditionalOStream.h

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/******************************************************************************
 * Copyright (c) 2021.                                                        *
 * The Regents of the University of Michigan and DFT-EFE developers.          *
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 * This file is part of the DFT-EFE code.                                     *
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 * DFT-EFE is free software: you can redistribute it and/or modify            *
 *   it under the terms of the Lesser GNU General Public License as           *
 *   published by the Free Software Foundation, either version 3 of           *
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                     *
 *   See the Lesser GNU General Public License for more details.              *
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/*
 * @author Bikash Kanungo
 */
#ifndef dftefeConditionalOstream_h
#define dftefeConditionalOstream_h
 
#include <ostream>
#include <utils/Defaults.h>
#include <iomanip>
 
//
// ACKNOWLEDGEMENT: The implementation of this class is borrowed from deal.II
//
namespace dftefe
{
  namespace utils
  {
    class ConditionalOStream
    {
    public:
      ConditionalOStream(
        std::ostream &  stream,
        const bool      active         = true,
        const size_type precision      = ConditionalOStreamDefaults::PRECISION,
        const bool      fixedPrecision = false);
 
      void
      setCondition(const bool active);
 
      bool
      isActive() const;
 
      std::ostream &
      getOStream() const;
 
      template <typename T>
      const ConditionalOStream &
      operator<<(const T &t) const;
 
      const ConditionalOStream &
      operator<<(std::ostream &(*p)(std::ostream &)) const;
 
    private:
      std::ostream &d_outputStream;
      bool          d_activeFlag;
    }; // end of class ConditionalOStream
 
  } // end of namespace utils
} // end of namespace dftefe
 
#include <utils/ConditionalOStream.t.cpp>
#endif // dftefeConditionalOstream_h