builder-qualifier-support.hpp

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/*
  BUILDER-QUALIFIER-SUPPORT.hpp  -  accept arbitrary qualifier terms for builder functions

  Copyright (C)         Lumiera.org
    2022,               Hermann Vosseler <Ichthyostega@web.de>

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of
  the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/


#ifndef LIB_BUILDER_QUALIFIER_SUPPORT_H
#define LIB_BUILDER_QUALIFIER_SUPPORT_H


#include <functional>


namespace lib {
  
  template<class TAR>
  class BuilderQualifierSupport
    {
    protected:
      using Manipulator = std::function<void(TAR&)>;
      
      struct Qualifier
        : Manipulator
        {
          using Manipulator::Manipulator;
        };
      
      template<class... QUALS>
      friend void qualify(TAR& target, Qualifier& qualifier, QUALS& ...qs)
      {
        qualifier(target);
        qualify(target, qs...);
      }
      
      friend void qualify(TAR&){ }
      
    public:
      // default construct and copyable
    };
  
  
}// namespace lib
#endif /*LIB_BUILDER_QUALIFIER_SUPPORT_H*/