Mail Archives: cygwin/1997/01/30/23:35:57
dahms AT ifk20 DOT mach DOT uni-karlsruhe DOT de wrote:
> I have never heard about the .h-less includes!
I assure you, it's been there since at least 1993. See
http://www.research.att.com/c++/ , which is an old (1995 April) draft of
the working paper, but a decent approximation to the overall structure,
at least, of the current document. See the libraries section.
> Would it be possible having *identical* contents for both, depending
> on _CPLUSPLUS or some such, protected from multiple includes by the same
> ifdef, or both just including another, third file with a secure name?
It's possible. Actually, the C++ standard has yet another out for this:
the C-standard headers are supposed to be "officially" included as
<cstdio>, <cstring>, etc. (i.e. truly conformant programs are not
supposed to use either <String.h> or <string.h>), which does solve the
problem.
But you can't make the same file return different things for C and C++,
since it should be possible to
#include <string.h>
.... strcpy(...) .... // error if you didn't include the C part
but at the same time,
#include <String>
.... strcpy(...) .... // MUST give an error, else namespace is polluted
So you can see - until the ANSI C++ standard is out there and in common
use, this thing is a can of worms..
--
Shankar Unni shankar AT chromatic DOT com
Chromatic Research (408) 752-9488
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