Extensibility primarily relates to the language itself and is ultimately decided by the C++ standards committee members. Programmers can make proposals to the committee, but they have no influence as such.
Extensibility with regards your own programs is entirely down to your design team. The language is immaterial on this regard, it's up to you to decide which standards your programs will adopt, whether extensibility is enabled through COM, NET, scripts or some user-defined/proprietary mechanism.
Note that extensibility is not the same as scalability, which is probably what you were really asking.
A manual check of the algorithm to ensure its correctness.
extensibility
b+b+b+c+c+c+c =3b+4c
c + c + 2c + c + c = 6c
b + b + b + c + c + c + c = 3b + 4c
4c
c + c + c + c + c = 5 * c.
eMASS provides automation (through the C&A package), accountability (through roles and PKI), extensibility (will scale to any enterprise size), and
There are no "primary and secondary keys" in c and c plus plus.
extensibility
3c
There is no such thing as 'unix C++'.