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https://github.com/bolero-MURAKAMI/Sprout.git
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53 lines
1.7 KiB
C++
53 lines
1.7 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 <sprout/config.hpp>
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#include <sprout/index_tuple/metafunction.hpp>
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#include <sprout/tuple/tuple.hpp>
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#include <sprout/tuple/functions.hpp>
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#include <sprout/tuple/indexes.hpp>
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#include <sprout/type/operation/append_front.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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: public sprout::types::append_front<Tuple, InputTuple>
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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, sprout::index_t... Indexes1, sprout::index_t... Indexes2>
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inline SPROUT_CONSTEXPR Result
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append_front_impl(
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Tuple const& t, InputTuple const& input,
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sprout::index_tuple<Indexes1...>, sprout::index_tuple<Indexes2...>
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)
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{
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return sprout::tuples::remake<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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inline SPROUT_CONSTEXPR typename sprout::tuples::result_of::append_front<Tuple, InputTuple>::type
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append_front(Tuple const& t, InputTuple const& input) {
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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, input,
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sprout::tuple_indexes<Tuple>::make(),
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sprout::tuple_indexes<InputTuple>::make()
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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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