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Refactor tupleReplace #435

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merged 1 commit into from
Dec 12, 2021
Merged

Refactor tupleReplace #435

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54 changes: 22 additions & 32 deletions include/llama/Tuple.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -143,44 +143,34 @@ namespace llama

namespace internal
{
template<std::size_t Pos, typename Tuple, typename Replacement>
struct TupleReplaceImpl
{
LLAMA_FN_HOST_ACC_INLINE
auto operator()(Tuple const tuple, Replacement const replacement)
{
return tupleCat(
llama::Tuple{tuple.first},
TupleReplaceImpl<Pos - 1, typename Tuple::RestTuple, Replacement>()(tuple.rest, replacement));
};
};

template<typename... Elements, typename Replacement>
struct TupleReplaceImpl<0, Tuple<Elements...>, Replacement>
{
LLAMA_FN_HOST_ACC_INLINE
auto operator()(Tuple<Elements...> tuple, Replacement const replacement)
{
return tupleCat(Tuple{replacement}, tuple.rest);
};
};

template<typename OneElement, typename Replacement>
struct TupleReplaceImpl<0, Tuple<OneElement>, Replacement>
template<
std::size_t Pos,
typename Tuple,
typename Replacement,
std::size_t... IsBefore,
std::size_t... IsAfter>
LLAMA_FN_HOST_ACC_INLINE constexpr auto tupleReplaceImpl(
Tuple&& tuple,
Replacement&& replacement,
std::index_sequence<IsBefore...>,
std::index_sequence<IsAfter...>)
{
LLAMA_FN_HOST_ACC_INLINE
auto operator()(Tuple<OneElement>, Replacement const replacement)
{
return Tuple{replacement};
}
};
return llama::Tuple{
get<IsBefore>(std::forward<Tuple>(tuple))...,
std::forward<Replacement>(replacement),
get<Pos + 1 + IsAfter>(std::forward<Tuple>(tuple))...};
}
} // namespace internal

/// Creates a copy of a tuple with the element at position Pos replaced by replacement.
template<std::size_t Pos, typename Tuple, typename Replacement>
LLAMA_FN_HOST_ACC_INLINE auto tupleReplace(Tuple tuple, Replacement replacement)
LLAMA_FN_HOST_ACC_INLINE constexpr auto tupleReplace(Tuple&& tuple, Replacement&& replacement)
{
return internal::TupleReplaceImpl<Pos, Tuple, Replacement>()(tuple, replacement);
return internal::tupleReplaceImpl<Pos>(
std::forward<Tuple>(tuple),
std::forward<Replacement>(replacement),
std::make_index_sequence<Pos>{},
std::make_index_sequence<std::tuple_size_v<std::decay_t<Tuple>> - Pos - 1>{});
}

namespace internal
Expand Down