mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
#ifndef SPROUT_TUPLE_OPERATION_APPEND_FRONT_HPP
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#define SPROUT_TUPLE_OPERATION_APPEND_FRONT_HPP
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#include <cstddef>
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#include <sprout/config.hpp>
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#include <sprout/index_tuple.hpp>
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#include <sprout/tuple/traits.hpp>
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#include <sprout/tuple/functions.hpp>
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namespace sprout {
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namespace tuples {
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namespace result_of {
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//
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// append_front
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//
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template<typename Tuple, typename InputTuple>
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struct append_front {
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private:
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template<typename IndexTuple1, typename IndexTuple2>
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struct apply_impl;
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template<std::ptrdiff_t... Indexes1, std::ptrdiff_t... Indexes2>
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struct apply_impl<sprout::index_tuple<Indexes1...>, sprout::index_tuple<Indexes2...> >
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: public sprout::tuples::rebind_types<
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Tuple
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>::template apply<
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typename sprout::tuples::tuple_element<Indexes2, InputTuple>::type...,
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typename sprout::tuples::tuple_element<Indexes1, Tuple>::type...
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>
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{};
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public:
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typedef typename apply_impl<
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typename sprout::index_range<0, sprout::tuples::tuple_size<Tuple>::value>::type,
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typename sprout::index_range<0, sprout::tuples::tuple_size<InputTuple>::value>::type
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>::type type;
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};
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} // namespace result_of
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namespace detail {
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template<typename Result, typename Tuple, typename InputTuple, std::ptrdiff_t... Indexes1, std::ptrdiff_t... Indexes2>
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SPROUT_CONSTEXPR inline Result append_front_impl(
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Tuple const& t,
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InputTuple const& input,
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sprout::index_tuple<Indexes1...>,
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sprout::index_tuple<Indexes2...>
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)
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{
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return sprout::tuples::remake_clone<Result>(
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t,
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sprout::tuples::get<Indexes2>(input)...,
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sprout::tuples::get<Indexes1>(t)...
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);
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}
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} // namespace detail
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//
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// append_front
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//
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template<typename Tuple, typename InputTuple>
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SPROUT_CONSTEXPR inline typename sprout::tuples::result_of::append_front<Tuple, InputTuple>::type append_front(
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Tuple const& t,
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InputTuple const& input
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)
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{
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return sprout::tuples::detail::append_front_impl<typename sprout::tuples::result_of::append_front<Tuple, InputTuple>::type>(
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t,
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input,
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typename sprout::index_range<0, sprout::tuples::tuple_size<Tuple>::value>::type(),
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typename sprout::index_range<0, sprout::tuples::tuple_size<InputTuple>::value>::type()
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);
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}
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} // namespace tuples
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} // namespace sprout
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#endif // #ifndef SPROUT_TUPLE_OPERATION_APPEND_FRONT_HPP
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