[Python-Dev] A macro for easier rich comparisons

[Petr Viktorin]

It seems the discussion on python-ideas, and also the patch review,
died down. So I'm posting to python-dev.

A macro like this would reduce boilerplate in stdlib and third-party C
extensions. It would ease porting C extensions to Python 3, where rich
comparison is mandatory.

#define Py_RETURN_RICHCOMPARE(val1, val2, op)                               \
    do {                                                                    \
        switch (op) {                                                       \
        case Py_EQ: if ((val1) == (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE;  \
        case Py_NE: if ((val1) != (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE;  \
        case Py_LT: if ((val1) < (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE;   \
        case Py_GT: if ((val1) > (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE;   \
        case Py_LE: if ((val1) <= (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE;  \
        case Py_GE: if ((val1) >= (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE;  \
        }                                                                   \
        Py_RETURN_NOTIMPLEMENTED;                                           \
    } while (0)

Is any of the core devs interested in this macro? Anything I can do to
help get it in?

http://bugs.python.org/issue23699