Origin of the term "first-class object"

[Erik Max Francis]

Rainer Deyke wrote:

> While you can't create new functions and unbound methods in C++ at
> runtime,
> you can take their address and pass that around as a first class
> object.

True, though that usually devolves into a semantic issue about whether
functions are first-class if you can only manipulate pointers to them. 
I usually say C has first-class functions if you squint.  C++ doesn't
have first-class bound member function pointers, as you point out, and
another obvious example in C++ is the lack of first-class classes -- a
feature in Python that is extremely powerful, since it almost makes the
"factory" pattern automatic in Python (the class object itself is just a
callable type that creates instances).

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