>If this code appears in system header files, it's dangerous because
>users can define macros with this name:
>
>#define STD_CSTDIO_H
>#include <cstdio>


As they can any other symbol the implementation chooses, rule or no rule (as
things are now).




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Stan Brown wrote in message ...
>Nine do in C, and nine do in C++. (Eight of the nine are the same.)


Why, yes they do. CRS strikes again. Of course they have those names because
of the existing rule. Under a different (better) rule that was not bound to
tradition and legacies, they would have other names. Some of them might not
be macros.





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>This is illegal, you're not allowed to #define cout before including
>any standard header (ANY, not only iostream).

Are you referring to a specific rule in the standard that makes that
particular #define illegal, or just saying that it's really not a good idea?



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