single.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_TENSOR_VIEWS_SINGLE_H
#define pRC_CORE_TENSOR_VIEWS_SINGLE_H
 
#include <prc/core/basic/functions/zero.hpp>
#include <prc/core/tensor/declarations.hpp>
 
namespace pRC::TensorViews
{
    template<class T, class N>
    class Single : public View<T, N, Single<T, N>>
    {
    private:
        using Base = View<T, N, Single>;
 
    public:
        template<class X>
            requires IsConstructible<T, X>
        Single(X &&value, typename Base::Subscripts const &subscripts)
            : mValue(forward<X>(value))
            , mSubscripts(subscripts)
        {
        }
 
        template<IsConvertible<Index>... Is>
            requires(sizeof...(Is) == Base::Dimension)
        constexpr decltype(auto) operator()(Is const... indices) const
        {
            return (*this)(typename Base::Subscripts(indices...));
        }
 
        constexpr T operator()(
            typename Base::Subscripts const &subscripts) const
        {
            if(subscripts == mSubscripts)
            {
                return mValue;
            }
            else
            {
                return zero();
            }
        }
 
        constexpr decltype(auto) operator[](Index const index) = delete;
        constexpr decltype(auto) operator[](Index const index) const = delete;
 
    private:
        T const mValue;
        typename Base::Subscripts const mSubscripts;
    };
}
#endif // pRC_CORE_TENSOR_VIEWS_SINGLE_H