spatial_compress.hpp

// -*- C++ -*-
//
// Copyright Sylvain Bougerel 2009 - 2013.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file COPYING or copy at
// http://www.boost.org/LICENSE_1_0.txt)

#ifndef SPATIAL_COMPRESS_HPP
#define SPATIAL_COMPRESS_HPP

namespace spatial
{
  namespace details
  {
    template<typename Base, typename Member>
    struct Compress
      : private Base // Empty member optimization
    {
      Compress() { }

      explicit Compress(const Base& compressed_base)
        : Base(compressed_base), _member() { }

      Compress(const Base& compressed_base, const Member& member)
        : Base(compressed_base), _member(member) { }

      const Base&
      base() const
      { return *static_cast<const Base*>(this); }

      Base&
      base()
      { return *static_cast<Base*>(this); }

      const Member&
      operator()() const
      { return _member; }

      Member&
      operator()()
      { return _member; }

    private:
      Member _member;
    };
  } // namespace details
} // namespace spatial

#endif // SPATIAL_COMPRESS_HPP