#define FLANN_USE_CUDA
#include <flann_cuda/flann.hpp>
#include <thrust/device_vector.h>
int main(int argc, char** argv)
{
    // int n_points = 10; ///< ERROR HERE!!!
    int n_points = 1000; ///< RUNS JUST FINE
    thrust::device_vector<float4>  points_vector( n_points );
    float* gpu_pointer = (float*)thrust::raw_pointer_cast(&points_vector[0]);
    flann::Matrix<float> matrix_gpu(gpu_pointer,n_points,3, 4);
    flann::KDTreeCuda3dIndexParams params;
    params["input_is_gpu_float4"]=true;
    flann::Index<flann::L2<float> > flannindex( matrix_gpu, params  );
    flannindex.buildIndex();
    return 0;
}

Starting /Users/andrea/Developer/htrack/apps/flann_gpu-build/flann_gpu...
terminate called after throwing an instance of 'thrust::system::system_error'
  what():  invalid argument
The program has unexpectedly finished.