[issue10542] Py_UNICODE_NEXT and other macros for surrogates

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

On Sat, Nov 27, 2010 at 5:03 PM, Marc-Andre Lemburg
<report at bugs.python.org> wrote:
..
>  * this version should be slightly faster and is also easier to read:
>
> #define Py_UCS4_READ_CODE_POINT(ptr, end) \
..
>      Py_UNICODE_JOIN_SURROGATES((ptr)++, (ptr)++) : \
..
>   I haven't tested it, but you get the idea.

I don't think C guarantees the order of evaluation of the operands in
bitwise expressions such as the expansion of the JOIN_SURROGATES
macro.

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<http://bugs.python.org/issue10542>
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