reference.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_TENSOR_VIEWS_REFERENCE_H
#define pRC_CORE_TENSOR_VIEWS_REFERENCE_H
 
#include <prc/core/tensor/type_traits.hpp>
 
namespace pRC::TensorViews
{
    template<class T, class N>
    class Reference;
 
    template<class T, Size... Ns>
    Reference(Tensor<T, Ns...> &) -> Reference<T, Sizes<Ns...>>;
 
    template<class T, Size... Ns>
    class Reference<T, Sizes<Ns...>>
        : public Assignable<T, Sizes<Ns...>, Reference<T, Sizes<Ns...>>>
    {
    private:
        using Base = Assignable<T, Sizes<Ns...>, Reference>;
 
    public:
        Reference(Tensor<T, Ns...> &a)
            : mA(a)
        {
        }
 
        using Base::operator=;
 
        template<class... Is, If<All<IsConvertible<Is, Index>...>> = 0,
            If<IsSatisfied<(sizeof...(Is) == typename Base::Dimension())>> = 0>
        constexpr decltype(auto) operator()(Is const... indices)
        {
            return mA(indices...);
        }
 
        template<class... Is, If<All<IsConvertible<Is, Index>...>> = 0,
            If<IsSatisfied<(sizeof...(Is) == typename Base::Dimension())>> = 0>
        constexpr decltype(auto) operator()(Is const... indices) const
        {
            return asConst(mA)(indices...);
        }
 
        constexpr decltype(auto) operator()(
            typename Base::Subscripts const &subscripts)
        {
            return mA(subscripts);
        }
 
        constexpr decltype(auto) operator()(
            typename Base::Subscripts const &subscripts) const
        {
            return asConst(mA)(subscripts);
        }
 
        constexpr decltype(auto) operator[](Index const index)
        {
            return mA[index];
        }
 
        constexpr decltype(auto) operator[](Index const index) const
        {
            return asConst(mA)[index];
        }
 
    private:
        Tensor<T, Ns...> &mA;
    };
}
#endif // pRC_CORE_TENSOR_VIEWS_REFERENCE_H