Object concepts in the C++ language

In 1980, a researcher, Bjarne Stroustrup, was asked to program an application for which the Simula language, because of the concepts it implements and in particular the notion of class, seemed the most appropriate. The experiment came to nothing for reasons of efficiency (the code generated didn't give the right response times for a real-time application). This researcher, probably remembering the genesis of the C language [1] , decided to follow the example of its designers, who, several years earlier, had wanted to rewrite the code of a system they had designed, Unix, and had come up against the absence of an efficient language for such an application: they had then designed the C language, an intermediary between an assembly language and an advanced language....