I am using GCC 7.5. When building packages, it complains about ordered comparison between integer and pointer, so I change the 0 in the comparison to nullptr.
But then I receive an error message that "'nullptr' was not declared in this scope".
Trying adding options -std=c++11 or -std=c++14 does not help.
All the programs are in C++.
it complains about ordered comparison between integer and pointer
"Ordered comparison" means comparison with > or < or >= or <=. It makes no sense to compare a pointer with a null pointer constant this way.
so I change the 0 in the comparison to nullptr
This doesn't make the comparison any more meaningful. It makes no sense to compare a pointer with a null pointer constant this way either.
But then I receive an error message that "'nullptr' was not declared in this scope".
This cannot happen with gcc 7.5 unless you
-std=c++98 or -std=c++03 somewhere orIn any case you probably want to fix the comparison (perhaps change > or < to !=) and only then think of maybe replacing 0 with nullptr.
pointer <= 0 and why. This makes no sense whatsoever to me so I have no idea whether == 0 or != 0 or anything else would be a good replacement (probably not). Perhaps ask a separate question about it and provide enough context.if (mixer_handle >= 0)