using complex_t = std::complex<double>;
    const complex_t plusI = complex_t(0, 1);
    const complex_t minusI = -complex_t(0, -1);

    const std::array<int, 16> baseWaves =
    {
        0, 1, 2, 3, 4, 5, 6, 7
    };

    template<typename signal_t>
    std::map<int, complex_t> transform(const signal_t& signal)
    {
        std::map<int, complex_t> results;
        const int signalLength = signal.size();

        for(size_t linearFrequencyIndex = 0; linearFrequencyIndex < baseWaves.size(); ++linearFrequencyIndex)

const std::array<int, 16> baseWaves =
    {
        0, 1, 2, 3, 4, 5, 6, 7
    };