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//
// immer: immutable data structures for C++
// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
//
// This software is distributed under the Boost Software License, Version 1.0.
// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
//
#pragma once
namespace scm {
namespace detail {
struct none_t;
template <typename... Ts>
struct pack {};
template <typename Pack>
struct pack_size;
template <typename... Ts>
struct pack_size<pack<Ts...>>
{
static constexpr auto value = sizeof...(Ts);
};
template <typename Pack>
constexpr auto pack_size_v = pack_size<Pack>::value;
template <typename Pack>
struct pack_last
{
using type = none_t;
};
template <typename T, typename ...Ts>
struct pack_last<pack<T, Ts...>>
: pack_last<pack<Ts...>>
{};
template <typename T>
struct pack_last<pack<T>>
{
using type = T;
};
template <typename Pack>
using pack_last_t = typename pack_last<Pack>::type;
} // namespace detail
} // namespace scm
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