[PyQt] Dealing with GCC/LLVM warning: zero as null pointer constant [-Wzero-as-null-pointer-constant]

[Brüns, Stefan]

Hi,

current versions of GCC and LLVM issue a warning when 0 is used for a null 
pointer. This is e.g. the case for generated code using sipCallMethod. The 
prototype of the underlying api_call_method interface is:

PyObject *(*api_call_method)(int *isErr, PyObject *method, const char *fmt, 
....)

The C++11 way for a correct call would be

sipCallMethod(nullptr, ....)

, but this only works for C++11 compliant compilers. I have tried different 
variants and compilers with godbolt:

https://godbolt.org/g/6wHC3n

, and the most portable one seems to be:
---
#if __cplusplus < 201103L
#define nullptr 0
#endif

sipCallMethod(nullptr, ...);
---

Any thoughts on this?

Kind regards,

Stefan