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auto eval = [](auto fun)
    {
        const auto t1 = std::chrono::high_resolution_clock::now();
        const auto [name, result] = fun();
        const auto t2 = std::chrono::high_resolution_clock::now();
        const std::chrono::duration<double, std::milli> ms = t2 - t1;
        std::cout << std::setw(28) << std::left << name << "sum: "
            << result << "\t time: " << ms.count() << " ms\n";
    };
{

    eval([&v] { return std::pair{ "std::count_if (seq, long)",
        std::count_if(SEQ
        v.begin(), v.end(),
        [](int elem) {
            return elem % 2 == 0;
        }) };  });
    eval([&v] { return std::pair{ "std::count_if (par, long)",
        std::count_if(PAR
        v.begin(), v.end(),
        [](int elem) {
            return elem % 2 == 0;
        }) };  });
        
        
   VS2022 C++17  release编译运行结果