some utility for GPU module internal purposes

modules/gpu/include/opencv2/gpu/gpu.hpp

@@ -52,7 +52,7 @@ namespace cv
 {
     namespace gpu
     {
-        //////////////////////////////// Initialization ////////////////////////
+        //////////////////////////////// Initialization & Info ////////////////////////
 
         //! This is the only function that do not throw exceptions if the library is compiled without Cuda.
         CV_EXPORTS int getCudaEnabledDeviceCount();
@@ -67,6 +67,11 @@ namespace cv
 
         CV_EXPORTS void getGpuMemInfo(size_t& free, size_t& total);
 
+        //////////////////////////////// Error handling ////////////////////////
+        
+        CV_EXPORTS void error(const char *error_string, const char *file, const int line, const char *func);
+        CV_EXPORTS void nppError( int err, const char *file, const int line, const char *func);        
+
         //////////////////////////////// GpuMat ////////////////////////////////
         class Stream;
         class CudaMem;