[ncmncm]

The first OOP language was Simula. Smalltalk and C++ both adopted ideas from Simula, independently. Bjarne Stroustrup was a student in Nygaard's lab, so it is absurd to suggest that C++ "reinterpreted" something. If anything, C++'s is the more pure expression of the original idea.

Alan Kay gets credit for the name "object-oriented", not the concept. His own definition has varied radically over the years, insisting only lately on any importance of message passing, as such. Smalltalk-72 was not OO. Smalltalk gained OO features over the time from 1972 to 1980. (Message passing has anyway always been isomorphic to function calls.)

Reflection was never described as essential to OOP. It is a feature of many languages, equally useful in all.