Traits.hpp

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/* Copyright 2024 Aurora Perego
 * SPDX-License-Identifier: MPL-2.0
 */
 
#pragma once
 
#include "alpaka/acc/Tag.hpp"
#include "alpaka/core/Common.hpp"
#include "alpaka/meta/DependentFalseType.hpp"
 
namespace alpaka
{
 
    namespace detail
    {
        template<typename TTag, typename T>
        struct DevGlobalImplGeneric
        {
            // does not make use of TTag
            using Type = std::remove_const_t<T>;
            Type value; // backend specific value
 
            ALPAKA_FN_HOST_ACC T* operator&()
            {
                return &value;
            }
 
            ALPAKA_FN_HOST_ACC T& get()
            {
                return value;
            }
        };
 
        template<typename TTag, typename T>
        struct DevGlobalTrait
        {
            static constexpr bool const IsImplementedFor = alpaka::meta::DependentFalseType<TTag>::value;
 
            static_assert(IsImplementedFor, "Error: device global variables are not implemented for the given Tag");
        };
    } // namespace detail
 
    template<typename TAcc, typename T>
    using DevGlobal = typename detail::DevGlobalTrait<typename alpaka::trait::AccToTag<TAcc>::type, T>::Type;
} // namespace alpaka