I have the following file test.c:
#define MAX (2U)
enum ENUM_EXAMPLE{ a, b, c, d, e, last };
#if( last = MAX )
#error Last is greater than MAX.
#endif
/*
* Never get as far as this main when compiling with other code to mater,
* need for the standalone test:
*/
int main( void )
{
}
If I do
Hi Bob,
The preprocessor runs, of course, before the compiler.
So you're trying to check if an enum is greater than some value, when the
compiler phase hasn't even evaluated the enum list and assigned values to
last.
For the preprocessor purposes, I would bet that somehow last evaluates to 0,
On Mon, 29 Aug 2011, Weddington, Eric wrote:
For the preprocessor purposes, I would bet that somehow last evaluates
to 0, so of course the condition will always be true.
Yes, I think this is part of the language standard (for better or worse).
I don't have a standard cite but it's described
On Mon, Aug 29, 2011 at 3:15 PM, Wim Lewis w...@.org wrote:
On Mon, 29 Aug 2011, Weddington, Eric wrote:
For the preprocessor purposes, I would bet that somehow last evaluates
to 0, so of course the condition will always be true.
[6] Identifiers that are not macros, which are all
From: graceindustr...@gmail.com
[...]
So that explains the difference. Seems like there could be a better
error message for this case, 'don't use enum here', alas The
preprocessor does not know anything about types in the language...
Here's a cute/ugly little macro that might help you
