Patch: stdbool.h should be compatible with C++

[Martin Buchholz]

>>>>> "A" == Alexandre Oliva <oliva@lsd.ic.unicamp.br> writes:

A> On Dec  5, 1999, Martin Buchholz <martin@xemacs.org> wrote:
>> #define true 1

>> is clearer and Just Works.

A> Not in C++, in which `true' is expected to have type `bool', not
A> `int'.

Hmmmmm.  I don't do much real C++ programming.  My head is in C99 land.

OK, how about something along the lines of:

#ifdef __cplusplus
#define false false
#define true true
#else
#define false 0
#define true 1
#endif

Although that will only allow the C preprocessor, not the C++
preprocessor, to use `true' and `false' in expressions.

I don't know enough about C++ to see a way to achieve the same for
C++; perhaps it is not in the spirit of the C++ language.

Alternatively, perhaps

#include <stdbool.h>

could be interpreted as asking for C semantics for true and false.  So
defining them to be 0 and 1 might be reasonable.

Another interpretation would be

#ifdef __cplusplus
/* do nothing */
#else
#define false 0
#define true 1
#endif

which is very likely close to what the user wants.

I leave it to the experts.  The important thing is to get it right for
C.

Martin