common nested types - dotnet^java^c++

Enum - is a common nested type in c++, java and dotnet. In java it's typically a static nested "class" . In c++, non-nested enum is more common than nested enum

Delegate - is a common nested type in dotnet. Many textbook examples declare custom delegates nested in a class. However, in practice, it's more common to declare it outside all classes - more reusable.

Local typedef - is a common nested "type" in c++