问如何在卤化物中使用C++随机函数？

EN

// Note: This is an implementation of the noise model found in the paper below:
// "Noise measurement for raw-data of digital imaging sensors by 
// automatic segmentation of non-uniform targets"
float get_normal_dist_rand( float mean, float std_dev ) {
  std::default_random_engine generator;
  std::normal_distribution<float> distribution(mean,std_dev);
  float out = distribution(generator);
  return out;
}

Func make_get_std_dev( Func *in_func ) {
  Var x, y, c;
  float q = 0.0060;
  float p = 0.0500;
  // std_dev = q * sqrt(unnoised_pixel - p)
  Func get_std_dev("get_std_dev");
    get_std_dev(x,y,c) = q * sqrt( (*in_func)(x,y,c) - p );
  return get_std_dev;
}

Func make_renoise( Func *in_func, Func *std_dev ) {
  Var x, y, c;
  // Noise parameters
  // noised_pixel = unnoised_pixel + 
  //                  gaussian_rand( std_dev = q * sqrt(unnoised_pixel - p) )
  // q and p values do not vary between channels
  Func renoise("renoise");
    renoise(x,y,c) = (*in_func)(x,y,c) +  
                       get_normal_dist_rand(0,(*std_dev)(x,y,c));   
  return renoise;
}

../common/pipe_stages.cpp: In function 'Halide::Func make_renoise(Halide::Func*, Halide::Func*)':
../common/pipe_stages.cpp:223:64: error: cannot convert 'std::enable_if<true, Halide::FuncRef>::type {aka Halide::FuncRef}' to 'float' for argument '2' to 'float get_normal_dist_rand(float, float)'
                        get_normal_dist_rand(0,(*std_dev)(x,y,c));  
                                                                ^