Method forward

cpp_core/src/fft3d.cpp:113–119

}

void FFT3D::forward(const Complex* in, Complex* out) const {
    // Copy input to FFTW buffer
    std::memcpy(buf_in_, in, sizeof(fftw_complex) * n_);
    fftw_execute(plan_fwd_);
    // Copy result out (no normalization for forward)
    std::memcpy(out, buf_out_, sizeof(fftw_complex) * n_);
}

void FFT3D::backward(const Complex* in, Complex* out) const {
    // Copy input to FFTW buffer