Union an alias when the difference is the volatile qualifier?

Jeffrey Walton noloader@gmail.com
Mon Aug 3 17:44:00 GMT 2015


>>> It's OK to cast a pointer to int to a pointer to volatile int and then
>>> dereference that pointer, but not vice versa.  So, GCC must assume
>>> that a pointer to volatile int may point to a non-volatile int object.
>>> But the reverse is not true: GCC need not assume that a pointer to int
>>> may point to a volatile int.
>>
>> One last question, and then I will be done. Is it OK to do in C++03 and above.
>
> I don't think that there is any difference between C and C++ in this
> regard, nor any intention to change it in later standards.  To break
> compatibility in this way would be catastrophic for a lot of software.

Thanks Andrew. /EOM.



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