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Sun Oct 19 18:31:32 EDT 2003 · https://mail.python.org/pipermail/python-dev/2003-October/039028.html

On Sunday 19 October 2003 11:40 pm, Brett C. wrote:
   ...
> #define Py_RETURN_FALSE do {Py_INCREF(Py_False); return Py_False;} while (0)
>
> Isn't {Py_INCREF(Py_None); return Py_None} enough?  I thought ending a
> curly brace with a semi-colon is harmless (equivalent of a NO-OP).  Why

Not in C: the extra semicolon is an empty statement.  So, for example

    if(...) {
    } ; else 

is a syntax error.

> bother with the do/while loop?

To let the user put a semicolon after the macro and get correct C code.

Alex

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[Python-checkins] python/dist/src/Include object.h, 2.121, 2.122 boolobject.h, 1.4, 1.5