components_join.hpp

Go to the documentation of this file.

//=======================================================================
// Copyright (c)
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//=======================================================================
#ifndef PAAL_COMPONENTS_JOIN_HPP
#define PAAL_COMPONENTS_JOIN_HPP

#include "paal/data_structures/components/components.hpp"

namespace paal {
namespace data_structures {

namespace detail {

   // assumes that names with defaults are already at the end of
   // concatenation of Components1 and Components2
   template <typename Components1, typename Components2>
      struct concat;

   template <typename... ComponentNamesWithDefaults1, typename... ComponentNamesWithDefaults2>
      struct concat<
         paal::data_structures::components<ComponentNamesWithDefaults1...>,
         paal::data_structures::components<ComponentNamesWithDefaults2...>
      > {
         using type = paal::data_structures::components<ComponentNamesWithDefaults1..., ComponentNamesWithDefaults2...>;
      };

}

template <typename Components1, typename Components2>
struct join;

template <typename Name1, typename Default1, typename... ComponentNamesWithDefaults1>
struct join<components<NameWithDefault<Name1, Default1>, ComponentNamesWithDefaults1...>, components<>> {
   using type = components<NameWithDefault<Name1, Default1>, ComponentNamesWithDefaults1...>;
};

template <typename Name1, typename Default1, typename... ComponentNamesWithDefaults1,
   typename Name2, typename Default2, typename... ComponentNamesWithDefaults2>
struct join<components<NameWithDefault<Name1, Default1>, ComponentNamesWithDefaults1...>,
components<NameWithDefault<Name2, Default2>, ComponentNamesWithDefaults2...>> {
   using type = components<
      NameWithDefault<Name1, Default1>,
      ComponentNamesWithDefaults1...,
      NameWithDefault<Name2, Default2>,
      ComponentNamesWithDefaults2...
   >;
};

template <typename Name1, typename Default1, typename... ComponentNamesWithDefaults1,
   typename ComponentName2, typename... ComponentNamesWithDefaults2>
struct join<components<NameWithDefault<Name1, Default1>, ComponentNamesWithDefaults1...>,
components<ComponentName2, ComponentNamesWithDefaults2...>> {
   using type = typename detail::concat<
      components<ComponentName2>,
      typename join<
         components<NameWithDefault<Name1, Default1>, ComponentNamesWithDefaults1...>,
         components<ComponentNamesWithDefaults2...>
      >::type
   >::type;
};

template <typename... ComponentNamesWithDefaults2>
struct join<components<>, components<ComponentNamesWithDefaults2...>> {
   using type = components<ComponentNamesWithDefaults2...>;
};

template <
   typename ComponentName1,
   typename... ComponentNamesWithDefaults1,
   typename... ComponentNamesWithDefaults2
>
struct join<
   components<ComponentName1, ComponentNamesWithDefaults1...>,
   components<ComponentNamesWithDefaults2...>
> {
   using type = typename detail::concat<
      components<ComponentName1>,
      typename join<components<ComponentNamesWithDefaults1...>, components<ComponentNamesWithDefaults2...>>::type
   >::type;
};

} 
} 

#endif /* PAAL_COMPONENTS_JOIN_HPP */