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/*!
@file
Defines `boost::hana::detail::type_foldl1`.
@copyright Louis Dionne 2013-2017
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_HANA_DETAIL_TYPE_FOLDL1_HPP
#define BOOST_HANA_DETAIL_TYPE_FOLDL1_HPP
#include <boost/hana/config.hpp>
BOOST_HANA_NAMESPACE_BEGIN namespace detail {
template <unsigned n>
struct type_foldl1_t;
template <>
struct type_foldl1_t<0> {
template <
template <typename ...> class f,
typename state
>
using result = state;
};
template <>
struct type_foldl1_t<1> {
template <
template <typename ...> class f,
typename state,
typename x1
>
using result = typename f<state, x1>::type;
};
template <>
struct type_foldl1_t<2> {
template <
template <typename ...> class f,
typename state,
typename x1, typename x2
>
using result = typename f<typename f<state, x1>::type, x2>::type;
};
template <>
struct type_foldl1_t<3> {
template <
template <typename ...> class f,
typename state,
typename x1, typename x2, typename x3
>
using result = typename f<
typename f<
typename f<state, x1>::type,
x2
>::type,
x3
>::type;
};
template <>
struct type_foldl1_t<4> {
template <
template <typename ...> class f,
typename state,
typename x1, typename x2, typename x3, typename x4
>
using result = typename f<
typename f<
typename f<
typename f<state, x1>::type,
x2
>::type,
x3
>::type,
x4
>::type;
};
template <>
struct type_foldl1_t<5> {
template <
template <typename ...> class f,
typename state,
typename x1, typename x2, typename x3, typename x4, typename x5
>
using result = typename f<
typename f<
typename f<
typename f<
typename f<state, x1>::type,
x2
>::type,
x3
>::type,
x4
>::type,
x5
>::type;
};
template <>
struct type_foldl1_t<6> {
template <
template <typename ...> class f,
typename state,
typename x1, typename x2, typename x3, typename x4, typename x5, typename x6,
typename ...xs
>
using result =
typename type_foldl1_t<(sizeof...(xs) > 6 ? 6 : sizeof...(xs))>::
template result<
f,
typename f<
typename f<
typename f<
typename f<
typename f<
typename f<state, x1>::type,
x2
>::type,
x3
>::type,
x4
>::type,
x5
>::type,
x6
>::type,
xs...
>;
};
template <template <typename ...> class f, typename x1, typename ...xn>
struct type_foldl1 {
using type = typename type_foldl1_t<(sizeof...(xn) > 6 ? 6 : sizeof...(xn))>
::template result<f, x1, xn...>;
};
} BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_DETAIL_TYPE_FOLDL1_HPP
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