Change cv::Mat to cv::Mat*

include/aidge/backend/opencv/data/TensorImpl.hpp

@@ -37,15 +37,19 @@ private:
     const Tensor &mTensor; // Impl needs to access Tensor information, but is not
                            // supposed to change it!
 
-    cv::Mat mData;
-
-    std::unique_ptr<cv::Mat> mDataOwner = std::unique_ptr<cv::Mat>(new cv::Mat(0,0,OpenCvType<T>::type));
+    cv::Mat* mData;
+    std::unique_ptr<cv::Mat> mDataOwner;
     
 public:
     static constexpr const char *Backend = "opencv";
 
+    TensorImpl_opencv() = delete;
     TensorImpl_opencv(const Tensor &tensor)
-      : TensorImpl(Backend), mTensor(tensor) {}
+      : TensorImpl(Backend), mTensor(tensor)
+    {
+        mDataOwner = std::unique_ptr<cv::Mat>(new cv::Mat(0,0,OpenCvType<T>::type));
+        mData = mDataOwner.get();
+    }
 
     bool operator==(const TensorImpl &otherImpl) const override final {
         // Create iterators for both matrices
@@ -69,11 +73,11 @@ public:
     }
 
     // native interface
-    const cv::Mat data() const { return mData; }
+    const cv::Mat data() const { return *mData; }
 
     std::size_t scalarSize() const override { return sizeof(T); }
 
-    std::size_t size() const override { return mData.total() * mData.channels(); }
+    std::size_t size() const override { return mData->total() * mData->channels();}
 
     void setDevice(DeviceIdx_t device) override {
         AIDGE_ASSERT(device == 0, "device cannot be != 0 for Opencv backend");
@@ -160,29 +164,29 @@ public:
 
     void *rawPtr(NbElts_t offset = 0) override {
         lazyInit();
-        return (mData.ptr<T>() + offset);
+        return (mData->ptr<T>() + offset);
     };
 
     const void *rawPtr(NbElts_t offset = 0) const override {
         AIDGE_ASSERT(size() >= mTensor.size(), "accessing uninitialized const rawPtr");
-        return (mData.ptr<T>() + offset);
+        return (mData->ptr<T>() + offset);
     };
 
     void *hostPtr(NbElts_t offset = 0) override {
         lazyInit();
-        return (mData.ptr<T>() + offset);
+        return (mData->ptr<T>() + offset);
     };
 
     const void *hostPtr(NbElts_t offset = 0) const override {
         AIDGE_ASSERT(size() >= mTensor.size(), "accessing uninitialized const hostPtr");
-        AIDGE_ASSERT(mData.isContinuous(), "CV Matrix not continuous");
-        return (mData.ptr<T>() + offset);
+        AIDGE_ASSERT(mData->isContinuous(), "CV Matrix not continuous");
+        return (mData->ptr<T>() + offset);
     };
 
     const cv::Mat& getCvMat() const override { return *mDataOwner.get(); }
     void setCvMat(const cv::Mat& mat) override {
         mDataOwner.reset(new cv::Mat(std::move(mat)));
-        mData = *mDataOwner.get();}
+        mData = mDataOwner.get();}
     
 
   virtual ~TensorImpl_opencv() = default;
@@ -192,7 +196,7 @@ private:
   void lazyInit() {
     if (size() < mTensor.size()) {
         // Need more data, a re-allocation will occur
-        AIDGE_ASSERT(mData.empty() || mDataOwner != nullptr, "trying to enlarge non-owned data");
+        AIDGE_ASSERT(mData->empty() || mDataOwner != nullptr, "trying to enlarge non-owned data");
 
         cv::Mat myNewMatrix;
         if (mTensor.nbDims() < 3) {
@@ -214,7 +218,7 @@ private:
         }
 
         mDataOwner.reset(new cv::Mat(std::forward<cv::Mat>(myNewMatrix)));
-        mData = *mDataOwner.get();
+        mData = mDataOwner.get();
       
     }
   }