unit.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_TENSOR_UNIT_H
#define pRC_CORE_TENSOR_UNIT_H
 
#include <prc/core/basic/functions/unit.hpp>
#include <prc/core/basic/unit.hpp>
#include <prc/core/functors/eval.hpp>
#include <prc/core/tensor/views/loop.hpp>
 
namespace pRC
{
    template<IsTensor T>
    struct Unit<T>
    {
        constexpr auto operator()() const
        {
            auto const f = []()
            {
                return unit<typename T::Type>();
            };
            using F = RemoveConstReference<decltype(f)>;
            using Sizes = typename T::Sizes;
            return TensorViews::Loop<typename T::Type, Sizes, F>(f);
        }
 
        template<class X>
            requires IsConstructible<typename T::Type, X>
        constexpr auto operator()(X &&value) const
        {
            auto const f = [value = typename T::Type(forward<X>(value))]()
            {
                return value;
            };
            using F = RemoveConstReference<decltype(f)>;
            using Sizes = typename T::Sizes;
            return TensorViews::Loop<typename T::Type, Sizes, F>(f);
        }
    };
 
    template<IsTensorView T>
    struct Unit<T> : Unit<ResultOf<Eval, T>>
    {
    };
}
#endif // pRC_CORE_TENSOR_UNIT_H