[ncmncm]

That was not the reason.

But it was the reason that C, as standardized, adopted several C++ innovations first.

[pjmlp]

It was definitly the reason, by 1992 it was impossible to buy a C compiler that also did not had a C++ one in the box.

Also why Apple moved from Object Pascal to C++ on MPW.

[ncmncm]

None of those C or C++ compilers came from Bell Labs, or were on UNIX tapes from Bell Labs. I used Cfront on Apollo machines in the '80s. Effectively nobody was using Cfront by 1992.

Apple, particularly, was not strongly influenced by Bell Labs or UNIX. Apple A/UX–a UNIX for Macintosh, a niche product from that period–shipped without a C++ compiler. MPW in 1992 shipped without a C++ compiler.

[pjmlp]

So what? Did you missed the part about compiler vendors?

Those were the ones that cared about C outside UNIX.

Bell Labs also had nothing to say to what happened to their code when they set it free.

And Zortech was one of the first vendors to move away from CFront.