Allow transferring borrowedPtr into NonNull variant and vice versa.

src/Memory/BorrowedPtr.hpp

@@ -2,6 +2,9 @@
 #define ARBUTILS_BORROWEDPTR_HPP
 
 namespace Arbutils::Memory {
+    template <class>
+    class NonNullBorrowedPtr;
+
     template <class T> class BorrowedPtr {
         T* _ptr;
 
@@ -13,6 +16,10 @@ namespace Arbutils::Memory {
         inline constexpr const T* GetUnsafe() const noexcept { return _ptr; }
         inline constexpr bool IsNull() const noexcept { return _ptr == nullptr; }
 
+        inline NonNullBorrowedPtr<T> GetNonNull(){
+            return NonNullBorrowedPtr<T>(_ptr);
+        }
+
         T* operator->() noexcept { return _ptr; }
         T* operator->() const noexcept { return _ptr; }
 

src/Memory/NonNullBorrowedPtr.hpp

@@ -4,6 +4,9 @@
 #include "BorrowedPtr.hpp"
 
 namespace Arbutils::Memory {
+    template <class>
+    class BorrowedPtr;
+
     template <class T> class NonNullBorrowedPtr {
     private:
         T* _ptr;
@@ -15,6 +18,10 @@ namespace Arbutils::Memory {
         inline constexpr T* GetUnsafe() noexcept { return _ptr; }
         inline constexpr const T* GetUnsafe() const noexcept { return _ptr; }
 
+        inline BorrowedPtr<T> GetOptional(){
+            return BorrowedPtr<T>(_ptr);
+        }
+
         T* operator->() noexcept { return _ptr; }
         T* operator->() const noexcept { return _ptr; }