[issue37483] Add PyObject_CallOneArg()

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

What do you think about macro like this?

  #define _PyObject_CALL_WITH_ARGS(func, ...) \
      _PyObject_Vectorcall(func, (PyObject*[]){NULL, __VA_ARGS__} + 1, \
              sizeof((PyObject*[]){__VA_ARGS__})/sizeof(PyObject*) | PY_VECTORCALL_ARGUMENTS_OFFSET, \
              NULL)

Pros: it can be used for 2 or 3 arguments too.
Cons: readability...

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nosy: +inada.naoki

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<https://bugs.python.org/issue37483>
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