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amrex::tupleToArray #3880

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merged 2 commits into from
Apr 10, 2024
Merged

amrex::tupleToArray #3880

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aa24310
amrex::tupleToArray
WeiqunZhang Apr 10, 2024
f2655d1
Make it return GpuArray and work for GPU
WeiqunZhang Apr 10, 2024
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24 changes: 24 additions & 0 deletions Src/Base/AMReX_Tuple.H
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
#define AMREX_TUPLE_H_
#include <AMReX_Config.H>

#include <AMReX_Array.H>
#include <AMReX_Functional.H>
#include <AMReX_GpuQualifiers.H>
#include <AMReX_TypeList.H>
Expand Down Expand Up @@ -392,6 +393,29 @@ MakeZeroTuple (GpuTuple<Ts...>) noexcept
return GpuTuple<Ts...>(static_cast<Ts>(0)...);
}

namespace detail {
template <typename T, std::size_t... I>
AMREX_GPU_HOST_DEVICE constexpr
auto tuple_to_array_helper (T const& tup, std::index_sequence<I...>) {
return GpuArray<typename GpuTupleElement<0,T>::type, sizeof...(I)>{amrex::get<I>(tup)...};
}
}

template <typename T>
AMREX_GPU_HOST_DEVICE constexpr
auto tupleToArray (GpuTuple<T> const& tup)
{
return GpuArray<T,1>{amrex::get<0>(tup)};
}

//! Convert GpuTuple<T,Ts...> to GpuArray
template <typename T, typename... Ts, std::enable_if_t<Same<T,Ts...>::value, int> = 0>
AMREX_GPU_HOST_DEVICE constexpr
auto tupleToArray (GpuTuple<T,Ts...> const& tup)
{
return detail::tuple_to_array_helper(tup, std::index_sequence_for<T,Ts...>{});
}

}

#endif /*AMREX_TUPLE_H_*/
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