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Adds array_tos and array_tot concepts. #533

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Adds array_tos and array_tot concepts. #533

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20 changes: 20 additions & 0 deletions src/TiledArray/tensor/type_traits.h
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Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,26 @@ template <typename... Ts>
inline constexpr const bool is_tensor_of_tensor_v =
is_tensor_of_tensor<Ts...>::value;

////////////////////////////////////////////////////////////////////////////////
/// It is sometimes desirable to distinguish between DistArrays with
/// tensor-of-scalars tiles vs tensor-of-tensors tiles.

///
/// True if the @tparam Array is a DistArray with tensor-of-scalars tile type.
/// e.g. DistArray<Tensor<double>>;
///
template <typename Array>
concept array_tos =
is_array_v<Array> && is_tensor_v<typename Array::value_type>;

///
/// True if the @tparam Array is a DistArray with tensor-of-tensors tile type.
/// e.g. DistArray<Tensor<Tensor<double>>>;
///
template <typename Array>
concept array_tot =
is_array_v<Array> && is_tensor_of_tensor_v<typename Array::value_type>;

////////////////////////////////////////////////////////////////////////////////

template <typename T1, typename T2, typename Enabler = void>
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