implement AccIsEnabled

[SimeonEhrig]

The value of AccIsEnabled indicates whether an accelerator is enabled for a specific tag.

[mehmetyusufoglu]

The value of AccIsEnabled indicates whether an accelerator is enabled for a specific tag.

[question] Where will this be used?

[SimeonEhrig]

The value of AccIsEnabled indicates whether an accelerator is enabled for a specific tag.

[question] Where will this be used?

To make it easier to write tests. An example from PR #2180

using TagList = std::tuple<
    alpaka::TagCpuSerial,
    alpaka::TagCpuThreads,
    alpaka::TagCpuTbbBlocks,
    alpaka::TagCpuOmp2Blocks,
    alpaka::TagCpuOmp2Threads,
    alpaka::TagGpuCudaRt,
    alpaka::TagGpuHipRt,
    alpaka::TagCpuSycl,
    alpaka::TagFpgaSyclIntel,
    alpaka::TagGpuSyclIntel>;

using TagTagList = alpaka::meta::CartesianProduct<std::tuple, TagList, TagList>;

TEMPLATE_LIST_TEST_CASE("printDefines", "[mem][visibility]", TagTagList)
{
    using Tag1 = std::tuple_element_t<0, TestType>;
    using Tag2 = std::tuple_element_t<1, TestType>;

    if constexpr(alpaka::AccIsEnabled<Tag1>::value && alpaka::AccIsEnabled<Tag2>::value)
    {
        SUCCEED(Tag1::get_name() << " + " << Tag2::get_name());

        using Acc1 = alpaka::TagToAcc<Tag1, Dim, Idx>;
        using Acc2 = alpaka::TagToAcc<Tag2, Dim, Idx>;
        // ...

        if constexpr((isCPUTag<Tag1>() && isCPUTag<Tag2>()) || std::is_same_v<Tag1, Tag2>)
        {
            STATIC_REQUIRE(alpaka::hasSameMemView(dev1, bufDev2));
            STATIC_REQUIRE(alpaka::hasSameMemView(dev2, bufDev1));
        }
        else
        {
            STATIC_REQUIRE_FALSE(alpaka::hasSameMemView(dev1, bufDev2));
            STATIC_REQUIRE_FALSE(alpaka::hasSameMemView(dev2, bufDev1));
        }
}

[SimeonEhrig]

During the VC today, @psychocoderHPC gave some improvements for this PR:

• add the TagList to the official API and rename it to AccTags
• add function, which returns list of tags, where the acc is enabled
• add trait, which return list of tags, which are bonded to Acc's which uses the cpuplatform
• change all tests to use tags instead the EnabledAccsElseInt list (extra PR)

[psychocoderHPC]

short doxygen introduction: https://www.doxygen.nl/manual/docblocks.html

[SimeonEhrig]

@psychocoderHPC ready to merge

[psychocoderHPC]

one open point we need to discuss.