test_eigen_fft.cxx

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#include <Eigen/Dense>

#include <unsupported/Eigen/FFT>

#include <iostream>
using namespace std;

int main()
{
    Eigen::FFT<float> fft;
    std::vector<float> timevec = {1,2,3,2,1};
    std::vector<std::complex<float> > freqvec;

    fft.fwd( freqvec,timevec);
    // manipulate freqvec
    fft.inv( timevec,freqvec);

    for (auto x: timevec) {
        cerr << x << " ";
    }
    cerr << endl;
    for (auto x: freqvec) {
        cerr << x << " ";
    }
    cerr << endl;

    // stored "plans" get destroyed with fft destructor

    return 0;
}