fft.h

#ifndef FFT_H
#define FFT_H
 
#include <vector>
#include <fftw3.h>
#include <complex>
#include <thread>
#include <mutex>
using namespace std;
typedef fftw_complex cpx;
 

class FFT
{
private:
    int n;
    cpx *f;
    static fftw_plan forward;
    static fftw_plan backward;
 
    // these vars are needed for multi-threading
    static cpx *dummy;
    static mutex m;
    
public:
    static bool planExists;
    FFT(int n);

    ~FFT();

    vector<complex<double>> fft(const vector<double> &v);

    vector<double> ifft(const vector<complex<double>> &c);

    static void preInit(int n);

    static void destroyPlan();
};
 
#endif