builder-qualifier-support.hpp

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/*
  BUILDER-QUALIFIER-SUPPORT.hpp  -  accept arbitrary qualifier terms for builder functions
 
   Copyright (C)
     2022,            Hermann Vosseler <Ichthyostega@web.de>
 
 **Lumiera** 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. See the file COPYING for further details.
 
*/
 
 
#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*/