Re: problems with identifiers and keywords...

On 17 Nov 2004 11:36:29 -0500, glen herrmannsfeldt
<gah@ugcs.caltech.edu> wrote:
<snip>
> The C language has relatively few keywords, but all the library
> function names are reserved.


Library function names are reserved within translation units (roughly
source files) if and only if the applicable standard header is
#include'd. E.g. fopen is reserved iff you #include <stdio.h>.


This implies that one standard header can't #include another just
because it would be convenient to share some of its contents e.g.
things like typedef size_t or #define NULL. OTOH _C++_ does allow any
standard C++ header to #include others, but (instead) its standard
headers put nearly everything in the std:: namespace so you can have
the same identifier in a (or the default) user namespace but you may
need (or want) to qualify uses of it.


All library function names are reserved _as external names_, meaning
at the linker level as always implemented although the standards can't
formally say so. This is pretty much inherent in traditional and still
pretty much(?) universal one-level linkers.


- David.Thompson1 at worldnet.att.net

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