nullstream.hpp

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#ifndef VIENNASHE_LOG_NULLSTREAM_HPP
#define VIENNASHE_LOG_NULLSTREAM_HPP
 
/* ============================================================================
   Copyright (c) 2011-2022, Institute for Microelectronics,
                            Institute for Analysis and Scientific Computing,
                            TU Wien.
 
                            -----------------
     ViennaSHE - The Vienna Spherical Harmonics Expansion Boltzmann Solver
                            -----------------
 
                    http://viennashe.sourceforge.net/
 
   License:         MIT (X11), see file LICENSE in the base directory
=============================================================================== */
 
#include <iosfwd>
#include <memory>
 
namespace viennashe
{
  namespace log
  {
 
    struct nullstream {};
 
    inline nullstream & get_nullstream()
    {
      // not exactly singleton, but enough for our purpose
      //static std::auto_ptr<nullstream> stnull(new nullstream());
      static std::unique_ptr<nullstream> stnull(new nullstream());
      return *stnull;
    }
 
    template <typename T>
    nullstream & operator<<(nullstream & s, T const &)           { return s; }
 
    inline nullstream & operator<<(nullstream & s, const std::string &) { return s; }
    inline nullstream & operator<<(nullstream & s, const char * )       { return s; }
 
    inline nullstream & operator<<(nullstream & s, std::ostream &(std::ostream&))  { return s; }
 
 
  } // log
} // viennashe
 
 
#endif