Start64!C++Builder 64-bit Windows Compiler: Supporting the Delphi Extensions Including RTTI. The C++ language standard provides a naming convention to identify language extensions using the double underbar (__) in front of any extensions. This session will discuss the language and runtime extensions added to the new C++Builder 64-bit Windows compiler to support Delphi language, types, components and enhanced RTTI.

Eli Boling - C++Builder 64-bit Windows Compiler - YouTube