intseq.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#pragma once
 
#include <utility>
 
namespace LC
{
namespace Util
{
namespace IntSeq
{
    template<typename T, T... Fst, T... Snd>
    std::integer_sequence<T, Fst..., Snd...>
    ConcatImpl (std::integer_sequence<T, Fst...>, std::integer_sequence<T, Snd...>);
 
    template<typename... Seqs>
    struct ConcatS;
 
    template<typename... Seqs>
    using Concat = typename ConcatS<Seqs...>::Type_t;
 
    template<typename Seq>
    struct ConcatS<Seq>
    {
        using Type_t = Seq;
    };
 
    template<typename Seq1, typename Seq2, typename... Rest>
    struct ConcatS<Seq1, Seq2, Rest...>
    {
        using Type_t = Concat<decltype (ConcatImpl (Seq1 {}, Seq2 {})), Rest...>;
    };
 
    template<typename T, T E, size_t C>
    struct RepeatS
    {
        template<T... Is>
        static auto RepeatImpl (std::integer_sequence<T, Is...>)
        {
            return std::integer_sequence<T, (static_cast<void> (Is), E)...> {};
        }
 
        using Type_t = decltype (RepeatImpl (std::make_integer_sequence<T, C> {}));
    };
 
    template<typename T, T E, size_t C>
    using Repeat = typename RepeatS<T, E, C>::Type_t;
}
}
}