Merge branch 'issue_6251' of http://github.com/dtmoodie/opencv into thrust_allocator_usage_pr

modules/core/include/opencv2/core/cuda/utility.hpp

@@ -57,7 +57,7 @@ namespace cv { namespace cuda { namespace device
     struct CV_EXPORTS ThrustAllocator
     {
         typedef uchar value_type;
-
+        virtual ~ThrustAllocator();
         virtual __device__ __host__ uchar* allocate(size_t numBytes) = 0;
         virtual __device__ __host__ void deallocate(uchar* ptr, size_t numBytes) = 0;
         static ThrustAllocator& getAllocator();

modules/core/src/cuda/gpu_mat.cu

@@ -56,6 +56,9 @@ using namespace cv;
 using namespace cv::cuda;
 using namespace cv::cudev;
 
+device::ThrustAllocator::~ThrustAllocator()
+{
+}
 namespace
 {
     class DefaultThrustAllocator: public cv::cuda::device::ThrustAllocator
@@ -73,6 +76,7 @@ namespace
         }
         __device__ __host__ void deallocate(uchar* ptr, size_t numBytes)
         {
+            (void)numBytes;
 #ifndef __CUDA_ARCH__
             CV_CUDEV_SAFE_CALL(cudaFree(ptr));
 #endif