> MPW was a submarine project, from UNIX background engineers, to eventually replace Pascal with C++.

According to Wikipedia, the first commercial C++ implementation came out in October of 1985, MPW was released in September of 1986, and MPW C was released in July of 1987.

C++ seems to have been added sometime in ~1988 (??)

Think C 4.0 (later Symantec C/C++) with (C++ like) object extensions seems to have been released for the Mac in 1989.