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  #ifndef OPENCV_DNN_LAYER_HPP
  #define OPENCV_DNN_LAYER_HPP
  #include <opencv2/dnn.hpp>
  
  namespace cv {
  namespace dnn {
  CV__DNN_INLINE_NS_BEGIN
  //! @addtogroup dnn
  //! @{
  //!
  //! @defgroup dnnLayerFactory Utilities for New Layers Registration
  //! @{
  
  /** @brief %Layer factory allows to create instances of registered layers. */
  class CV_EXPORTS LayerFactory
  {
  public:
  
      //! Each Layer class must provide this function to the factory
      typedef Ptr<Layer>(*Constructor)(LayerParams &params);
  
      //! Registers the layer class with typename @p type and specified @p constructor. Thread-safe.
      static void registerLayer(const String &type, Constructor constructor);
  
      //! Unregisters registered layer with specified type name. Thread-safe.
      static void unregisterLayer(const String &type);
  
      /** @brief Creates instance of registered layer.
       *  @param type type name of creating layer.
       *  @param params parameters which will be used for layer initialization.
       *  @note Thread-safe.
       */
      static Ptr<Layer> createLayerInstance(const String &type, LayerParams& params);
  
  private:
      LayerFactory();
  };
  
  //! @}
  //! @}
  CV__DNN_INLINE_NS_END
  }
  }
  #endif
  