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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009, 2011 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library 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 3, or (at your option) any later

// version.

// This library 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.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// Permission to use, copy, modify, sell, and distribute this software

// is hereby granted without fee, provided that the above copyright

// notice appears in all copies, and that both that copyright notice

// and this permission notice appear in supporting documentation. None

// of the above authors, nor IBM Haifa Research Laboratories, make any

// representation about the suitability of this software for any

// purpose. It is provided "as is" without express or implied

// warranty.

/**

 * @file detail/types_traits.hpp

 * Contains a traits class of types used by containers.

 */

#ifndef PB_DS_TYPES_TRAITS_HPP

#define PB_DS_TYPES_TRAITS_HPP

#include <algorithm>

#include <utility>

#include <ext/pb_ds/tag_and_trait.hpp>

#include <ext/pb_ds/detail/type_utils.hpp>

#include <utility>

namespace __gnu_pbds

{

  namespace detail

  {

    /**

     *  @addtogroup traits Traits

     *  @{

     */

    /// Primary template.

    template<typename Key, typename Mapped>

      struct no_throw_copies

      {

        static const bool __simple = is_simple<Key>::value

                                 && is_simple<Mapped>::value;

        typedef integral_constant<int, __simple>                indicator;

      };

    /// Specialization.

    template<typename Key>

      struct no_throw_copies<Key, null_type>

      {

        typedef integral_constant<int, is_simple<Key>::value>   indicator;

      };

    /// Stored value.

    template<typename _Tv>

      struct stored_value

      {

        typedef _Tv     value_type;

        value_type      m_value;

      };

    /// Stored hash.

    template<typename _Th>

      struct stored_hash

      {

        typedef _Th     hash_type;

        hash_type       m_hash;

      };

    /// Primary template for representation of stored data.

    /// Two types of data can be stored: value and hash.

    template<typename _Tv, typename _Th>

      struct stored_data

      : public stored_value<_Tv>, public stored_hash<_Th>

      { };

    /// Specialization for representation of stored data of just value type.

    template<typename _Tv>

      struct stored_data<_Tv, null_type>

      : public stored_value<_Tv>

      { };

    /// Primary template.

    template<typename Key, typename Mapped, typename _Alloc, bool Store_Hash>

      struct type_base;

    /**

     * Specialization of type_base for the case where the hash value

     * is not stored alongside each value.

     */

    template<typename Key, typename Mapped, typename _Alloc>

      struct type_base<Key, Mapped, _Alloc, false>

      {

      public:

        typedef typename _Alloc::size_type              size_type;

      private:

        typedef typename _Alloc::template rebind<Mapped>        __rebind_m;

        typedef typename __rebind_m::other                      __rebind_ma;

        typedef std::pair<const Key, Mapped>                    __value_type;

        typedef typename _Alloc::template rebind<__value_type>  __rebind_v;

        typedef typename __rebind_v::other                      __rebind_va;

      public:

        typedef typename __rebind_ma::value_type        mapped_type;

        typedef typename __rebind_ma::pointer           mapped_pointer;

        typedef typename __rebind_ma::const_pointer     mapped_const_pointer;

        typedef typename __rebind_ma::reference         mapped_reference;

        typedef typename __rebind_ma::const_reference   mapped_const_reference;

        typedef typename __rebind_va::value_type        value_type;

        typedef typename __rebind_va::pointer           pointer;

        typedef typename __rebind_va::const_pointer     const_pointer;

        typedef typename __rebind_va::reference         reference;

        typedef typename __rebind_va::const_reference   const_reference;

        typedef stored_data<value_type, null_type>      stored_data_type;

      };

    /**

     * Specialization of type_base for the case where the hash value

     * is stored alongside each value.

     */

    template<typename Key, typename Mapped, typename _Alloc>

      struct type_base<Key, Mapped, _Alloc, true>

      {

      public:

        typedef typename _Alloc::size_type              size_type;

      private:

        typedef typename _Alloc::template rebind<Mapped>        __rebind_m;

        typedef typename __rebind_m::other                      __rebind_ma;

        typedef std::pair<const Key, Mapped>                    __value_type;

        typedef typename _Alloc::template rebind<__value_type>  __rebind_v;

        typedef typename __rebind_v::other                      __rebind_va;

      public:

        typedef typename __rebind_ma::value_type        mapped_type;

        typedef typename __rebind_ma::pointer           mapped_pointer;

        typedef typename __rebind_ma::const_pointer     mapped_const_pointer;

        typedef typename __rebind_ma::reference         mapped_reference;

        typedef typename __rebind_ma::const_reference   mapped_const_reference;

        typedef typename __rebind_va::value_type        value_type;

        typedef typename __rebind_va::pointer           pointer;

        typedef typename __rebind_va::const_pointer     const_pointer;

        typedef typename __rebind_va::reference         reference;

        typedef typename __rebind_va::const_reference   const_reference;

        typedef stored_data<value_type, size_type>      stored_data_type;

      };

    /**

     * Specialization of type_base for the case where the hash value

     * is not stored alongside each value.

     */

    template<typename Key, typename _Alloc>

      struct type_base<Key, null_type, _Alloc, false>

      {

      public:

        typedef typename _Alloc::size_type              size_type;

        typedef Key                                     value_type;

      private:

        typedef typename _Alloc::template rebind<null_type>     __rebind_m;

        typedef typename __rebind_m::other                      __rebind_ma;

        typedef typename _Alloc::template rebind<value_type>    __rebind_v;

        typedef typename __rebind_v::other                      __rebind_va;

      public:

        typedef typename __rebind_ma::value_type        mapped_type;

        typedef typename __rebind_ma::pointer           mapped_pointer;

        typedef typename __rebind_ma::const_pointer     mapped_const_pointer;

        typedef typename __rebind_ma::reference         mapped_reference;

        typedef typename __rebind_ma::const_reference   mapped_const_reference;

        typedef typename __rebind_va::pointer           pointer;

        typedef typename __rebind_va::const_pointer     const_pointer;

        typedef typename __rebind_va::reference         reference;

        typedef typename __rebind_va::const_reference   const_reference;

        typedef stored_data<value_type, null_type>      stored_data_type;

        static null_type                        s_null_type;

      };

    template<typename Key, typename _Alloc>

      null_type

      type_base<Key, null_type, _Alloc, false>::s_null_type;

    /**

     * Specialization of type_base for the case where the hash value

     * is stored alongside each value.

     */

    template<typename Key, typename _Alloc>

      struct type_base<Key, null_type, _Alloc, true>

      {

      public:

        typedef typename _Alloc::size_type              size_type;

        typedef Key                                     value_type;

      private:

        typedef typename _Alloc::template rebind<null_type>     __rebind_m;

        typedef typename __rebind_m::other                      __rebind_ma;

        typedef typename _Alloc::template rebind<value_type>    __rebind_v;

        typedef typename __rebind_v::other                      __rebind_va;

      public:

        typedef typename __rebind_ma::value_type        mapped_type;

        typedef typename __rebind_ma::pointer           mapped_pointer;

        typedef typename __rebind_ma::const_pointer     mapped_const_pointer;

        typedef typename __rebind_ma::reference         mapped_reference;

        typedef typename __rebind_ma::const_reference   mapped_const_reference;

        typedef typename __rebind_va::pointer           pointer;

        typedef typename __rebind_va::const_pointer     const_pointer;

        typedef typename __rebind_va::reference         reference;

        typedef typename __rebind_va::const_reference   const_reference;

        typedef stored_data<value_type, size_type>      stored_data_type;

        static null_type                        s_null_type;

      };

    template<typename Key, typename _Alloc>

      null_type

      type_base<Key, null_type, _Alloc, true>::s_null_type;

    /// Type base dispatch.

    template<typename Key, typename Mapped, typename _Alloc, bool Store_Hash>

      struct type_dispatch

      {

        typedef type_base<Key, Mapped, _Alloc, Store_Hash> type;

      };

    /// Traits for abstract types.

    template<typename Key, typename Mapped, typename _Alloc, bool Store_Hash>

      struct types_traits

      : public type_dispatch<Key, Mapped, _Alloc, Store_Hash>::type

      {

      private:

        typedef no_throw_copies<Key, Mapped>            __nothrowcopy;

        typedef typename _Alloc::template rebind<Key>::other __rebind_a;

      public:

        typedef typename _Alloc::size_type              size_type;

        typedef typename __rebind_a::value_type         key_type;

        typedef typename __rebind_a::pointer            key_pointer;

        typedef typename __rebind_a::const_pointer      key_const_pointer;

        typedef typename __rebind_a::reference          key_reference;

        typedef typename __rebind_a::const_reference    key_const_reference;

        typedef std::pair<size_type, size_type>         comp_hash;

        typedef integral_constant<int, Store_Hash>      store_extra;

        typedef typename __nothrowcopy::indicator       no_throw_indicator;

        store_extra                             m_store_extra_indicator;

        no_throw_indicator                      m_no_throw_copies_indicator;

    };

    //@}

  } // namespace detail

} // namespace __gnu_pbds

#endif