Added AnyPtr for possible future use

include/aidge/backend/TensorImpl.hpp

@@ -19,6 +19,45 @@
 #include "aidge/utils/ErrorHandling.hpp"
 
 namespace Aidge {
+/**
+ * This is a thin wrapper around std::any that can only hold pointers.
+ * It also handles the case where a U* pointer is stored and a const U* pointer
+ * is requested, which is legit (std::any would throw a bad_cast exception in
+ * this case).
+ * Note: not used yet, put in reserve here for possible future use.
+*/
+/*
+class AnyPtr {
+public:
+    template <typename T, typename = std::enable_if_t<std::is_pointer<T>::value>>
+    constexpr inline AnyPtr(T value) : data(value), ptrToConst(std::is_const<std::remove_pointer_t<T>>::value) {}
+
+    // Requested T is "U*"
+    template <typename T, typename std::enable_if<std::is_same<std::remove_pointer_t<T>, std::remove_const_t<std::remove_pointer_t<T>>>::value>::type* = nullptr>
+    constexpr inline T get() const {
+        // data has to be "U*"
+        return future_std::any_cast<T>(data);
+    }
+
+    // Requested T is "const U*"
+    template <typename T, typename std::enable_if<!std::is_same<std::remove_pointer_t<T>, std::remove_const_t<std::remove_pointer_t<T>>>::value>::type* = nullptr>
+    constexpr inline T get() const {
+        if (ptrToConst) {
+            // data is "const U*" => OK, no bad cast
+            return future_std::any_cast<T>(data);
+        }
+        else {
+            // data is "U*" => need to remove const from request to avoid bad cast
+            return future_std::any_cast<std::add_pointer_t<std::remove_const_t<std::remove_pointer_t<T>>>>(data);
+        }
+    }
+
+private:
+    const future_std::any data;
+    const bool ptrToConst;
+};
+*/
+
 /**
  * This class manages the raw data storage of a Tensor and provide generic copy
  * primitives from other devices and from/to host.