oraltypes.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Boost Software License - Version 1.0 - August 17th, 2003
 *
 * Permission is hereby granted, free of charge, to any person or organization
 * obtaining a copy of the software and accompanying documentation covered by
 * this license (the "Software") to use, reproduce, display, distribute,
 * execute, and transmit the Software, and to prepare derivative works of the
 * Software, and to permit third-parties to whom the Software is furnished to
 * do so, all subject to the following:
 *
 * The copyright notices in the Software and this entire statement, including
 * the above license grant, this restriction and the following disclaimer,
 * must be included in all copies of the Software, in whole or in part, and
 * all derivative works of the Software, unless such copies or derivative
 * works are solely in the form of machine-executable object code generated by
 * a source language processor.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
 * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 **********************************************************************/

#pragma once

#define BOOST_RESULT_OF_USE_DECLTYPE

#include <type_traits>
#include <boost/fusion/include/at_c.hpp>
#include <boost/fusion/adapted/struct/adapt_struct.hpp>
#include <boost/fusion/include/adapt_struct.hpp>
#include <util/sll/typelist.h>

namespace LeechCraft
{
namespace Util
{
namespace oral
{
    struct NoAutogen;

    template<typename T, typename... Tags>
    struct PKey
    {
        using value_type = T;

        T Val_;

        PKey () = default;

        PKey (T val)
        : Val_ { val }
        {
        }

        PKey& operator= (T val)
        {
            Val_ = val;
            return *this;
        }

        operator value_type () const
        {
            return Val_;
        }

        const value_type& operator* () const
        {
            return Val_;
        }
    };

    template<typename T>
    struct Unique
    {
        using value_type = T;

        T Val_;

        Unique () = default;

        Unique (T val)
        : Val_ { val }
        {
        }

        Unique& operator= (T val)
        {
            Val_ = val;
            return *this;
        }

        operator value_type () const
        {
            return Val_;
        }

        const value_type& operator* () const
        {
            return Val_;
        }
    };

    namespace detail
    {
        template<typename T>
        struct IsPKey : std::false_type {};

        template<typename U, typename... Tags>
        struct IsPKey<PKey<U, Tags...>> : std::true_type {};
    }

    template<typename Seq, int Idx>
    struct References
    {
        using member_type = typename std::decay<typename boost::fusion::result_of::at_c<Seq, Idx>::type>::type;
        static_assert (detail::IsPKey<member_type>::value, "References<> element must refer to a PKey<> element");

        using value_type = typename member_type::value_type;
        value_type Val_;

        References () = default;

        References (value_type t)
        : Val_ { t }
        {
        }

        template<typename T, typename... Tags>
        References (const PKey<T, Tags...>& key)
        : Val_ (static_cast<T> (key))
        {
        }

        References& operator= (const value_type& val)
        {
            Val_ = val;
            return *this;
        }

        template<typename T, typename... Tags>
        References& operator= (const PKey<T, Tags...>& key)
        {
            Val_ = key;
            return *this;
        }

        operator value_type () const
        {
            return Val_;
        }

        const value_type& operator* () const
        {
            return Val_;
        }
    };

    template<int... Fields>
    struct PrimaryKey;

    template<int... Fields>
    struct UniqueSubset;

    template<typename... Args>
    using Constraints = Typelist<Args...>;
}
}
}