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About inheritance
Now, you might be wondering why is there no inheritance in ++C. There's a really simple reason: I don't think an OOP language needs it. It makes your code very rigid and generally harder to understand. But that's not the only reason: the ++C's architecture is made to be simple, and the inheritance, architecturally, make the architecture very complicated.
How to use inheritance patterns
There is a saying in the programmer community: composition over inheritance. What does this mean? In short, it means that instead of inheritance, you'll have a reference to your super object as a field. An equivalent of the abstract method would be to pass the this (as a contract) to the super object.
Class-contract hybrid
What does this mean? This means that there will be an option to define contract functions and properties, which will be exported in a separate contract type. That type will be exported, but it can't be referenced, unless inside the class-contract hybrid. Then, the contract can be accessed with the contract keyword, which usually is invalid in a class definition. This will be useful for accepting the contract as a constructor parameter, which will be useful for composition (over inheritance).