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Non-recursive at_index implementation #2017

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Mar 7, 2016
Merged

Non-recursive at_index implementation #2017

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36 changes: 27 additions & 9 deletions hpx/util/detail/pack.hpp
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Copyright (c) 2014 Agustin Berge
// Copyright (c) 2014-2016 Agustin Berge
//
// 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)
Expand Down Expand Up @@ -110,19 +110,37 @@ namespace hpx { namespace util { namespace detail
{};

///////////////////////////////////////////////////////////////////////////
template <std::size_t I, typename ...Ts>
struct at_index;
template <std::size_t I, typename T>
struct indexed
{
typedef T type;
};

template <typename Ts, typename Is>
struct indexer;

template <std::size_t I, typename T, typename ...Ts>
struct at_index<I, T, Ts...>
: at_index<I - 1, Ts...>
template <typename ...Ts, std::size_t ...Is>
struct indexer<pack<Ts...>, pack_c<std::size_t, Is...>>
: indexed<Is, Ts>...
{};

template <typename T, typename ...Ts>
struct at_index<0, T, Ts...>
template <std::size_t I, typename Ts>
struct at_index_impl
{
typedef T type;
static empty check_(...);

template <std::size_t J, typename T>
static indexed<J, T> check_(indexed<J, T> const&);

typedef decltype(check_<I>(indexer<
Ts, typename make_index_pack<Ts::size>::type
>())) type;
};

template <std::size_t I, typename ...Ts>
struct at_index
: at_index_impl<I, pack<Ts...> >::type
{};
}}}

#endif