Support for easy type casting from borrowed_ptr.

src/Memory/borrowed_ptr.hpp

@@ -3,8 +3,10 @@
 
 #include <memory>
 
-/// A borrowed pointer is used to indicate a pointer that is not owned by an object, but instead borrowed from another
+namespace ArbUt::Memory {
-/// owning object that is assumed to always be kept alive during the entire lifetime of the borrowing object.
+    /// A borrowed pointer is used to indicate a pointer that is not owned by an object, but instead borrowed from
+    /// another owning object that is assumed to always be kept alive during the entire lifetime of the borrowing
+    /// object.
     template <class T> class borrowed_ptr {
     private:
         T* _raw;
@@ -29,6 +31,25 @@ public:
         inline bool operator!=(const borrowed_ptr& rhs) const { return _raw != rhs._raw; }
 
         [[nodiscard]] inline constexpr bool IsNull() const noexcept { return _raw == nullptr; }
+
+        template <class TCast> inline borrowed_ptr<TCast> As() const {
+            auto cast = dynamic_cast<TCast>(_raw);
+            return borrowed_ptr<TCast>(cast);
+        }
+
+        template <class TCast> inline bool TryAs(borrowed_ptr<TCast>& out) const {
+            auto cast = dynamic_cast<TCast>(_raw);
+            if (cast == nullptr)
+                return false;
+            out = borrowed_ptr<TCast>(cast);
+            return true;
+        }
+
+        template <class TCast> inline borrowed_ptr<TCast> ForceAs() const {
+            auto cast = reinterpret_cast<TCast>(_raw);
+            return borrowed_ptr<TCast>(cast);
+        }
     };
+}
 
 #endif // ARBUTILS_BORROWED_PTR_HPP