Extensions contain SUBPROCEDUREs and VARIABLEs that are written in another language and usable in LDPL through the CALL EXTERNAL statement and EXTERNAL data type keyword. This allows programmers to extend LDPL with new features or to wrap 3rd party libraries and re-use their functionality.
Starting with release 3.0.0, LDPL supports extensions written in C++. Because LDPL programs compile down to C++, there is no need for a translation layer or bridge: extensions can be included directly into LDPL programs and manipulate, share, and access subprocedures and variables natively. All that's needed is a few naming conventions on the C++ side and the use of the
EXTERNAL syntax for variables and subprocedures on the LDPL side.