Restructure cuda backend

include/layers/add.hpp

@@ -0,0 +1,49 @@
+#ifndef CUDANET_ADD_LAYER_H
+#define CUDANET_ADD_LAYER_H
+
+namespace CUDANet::Layers {
+
+class Add {
+  public:
+    /**
+     * @brief Create a new Add layer
+     *
+     * @param inputSize Size of the input arrays
+     */
+    Add(int inputSize);
+
+    /**
+     * @brief Destroy the Add layer
+     *
+     */
+    ~Add();
+
+    /**
+     * @brief Adds first input to second input
+     *
+     * @param d_inputA Device pointer to the first input
+     * @param d_inputB Device pointer to the second input
+     *
+     */
+    float* forward(const float* inputA, const float* inputB);
+
+  private:
+    int inputSize;
+
+    float* output;
+
+    float* forwardCPU(const float* inputA, const float* inputB);
+
+#ifdef USE_CUDA
+    float* d_output;
+    int gridSize;
+
+    float* forwardCUDA(const float* d_inputA, const float* d_inputB);
+    void initCUDA();
+    void delCUDA();
+#endif
+};
+
+}  // namespace CUDANet::Layers
+
+#endif  // CUDANET_ADD_LAYER_H