3. In order to use a dynamic_cast<> in a C++ program, runtime type information must be enabled. Permanently cast derived class to base - C# [ Glasses to protect eyes while coding : https://amzn.to/3N1ISWI ] Permanently cast derived class to base - C# D. [Bug c++/28523] [4.0 Regression] Throw of a derived class casted to its base class using a C-style cast. For example, in the below program in the main () method, assignment of the derived class "Circle" object to the base class "Shape" reference is up-casting. It is always allowed for public inheritance, without an explicit type cast. Up-casting and Down-casting in C# Inheritance - Interview Sansar } class Derived : Base { [ .. . ] The base keyword is used to access members of the base class from within a derived class: Call a method on the base class that has been overridden by another method. You cannot automatically convert a base class instance into a derived class instance: it would involve the system "inventing" data. Casting and type conversions - C# Programming Guide It cannot inherit properties and methods of Derived Class. Level2 derives from Level1 which derives from Base. I have a templated class that derives from a non-templated abstract class. To serialize the properties of the derived type in the preceding example, use one of the following approaches: Call an overload of Serialize that lets you specify the type at run time: C#. options = new JsonSerializerOptions { WriteIndented = true }; jsonString = JsonSerializer.Serialize (weatherForecast, weatherForecast.GetType (), options . The rules are that a pointer to D with some const / volatile qualifications can be converted to a pointer to B with the same qualifiers if B is a base class of D. The standard conversions are implicit conversions with built-in meanings and are separate concepts to things like static_cast or C-style casts. Here is a sample: public class Base { The class that inherits the members of the base class is called the derived class. This problem has been solved! You can't instantiate an abstract class, but you can still "cast down" and get a reference to the base class of an existing object, which is what is happening with your code. C++ static_cast shared_ptr from base to derived class. [Error] invalid static_cast from type 'Derived*' to type 'MyClass*' dynamic_cast: This cast is used for handling polymorphism. +5. [Solved] Cannot implicitly convert type 'BaseClass' to ... - CodeProject This has all been removed for the sake of putting together a concise example. You can, if you create a specific cast operator because you can "fill in" the missing infor yourself, but I really don't recommend it at all. Convert a List of BaseClass to a List of DerivedClass ... - Fire Breaks Ice 2. A program can thereby use a class hierarchy safely. Nov 8, 2010. [RTTI] cast base class pointer to <templated> derived class pointer - C ... How can Derived class inherit a static function from Base class - C++ ... So the standard term for this is "downcast". Here's my design: SPair<SP1, SP2> derives from Pair<P1,P2> and Ser: If the conversion cannot be done, the result is a pointer of value nullptr . Difference between Base class and Derived class in C++