Re: [xine-devel] XINE_ASSERT vs assert()

[Mark T. <mb...@do...>]

On Sun, 2 Mar 2003, Stephen Torri wrote:

>
>How can this macro be modified so that it can print out the expression?
>The reason that asserts were replaced is that there typically is no
>explanation given beyond the assert expression as to why it failed.
>

Try this:

#ifndef NDEBUG
#define XINE_ASSERT(exp, desc, args...)                             \
  do {                                                              \
    if (!(exp)) {                                                   \
      printf("%s:%s:%d: assertion `%s' failed. " desc "\n\n",       \
            __FILE__, __XINE_FUNCTION__, __LINE__, #exp , ##args);  \
      print_trace();                                                \
      abort();                                                      \
    }                                                               \
  } while(0)
#else
#define XINE_ASSERT(...) do { } while(0)
#endif


It handles the NDEBUG macro, expressions with % characters in, and I've
verified it works (at least in principle) on gcc 2.95.3, gcc 3.2.2 and
icc 7.0.065 (though this complains about `do {...} while(0)'
wrappers... sigh).

The spacing around the ``##args'' argument is important, as the gcc 2
preprocessor has parsing problems.

Regards,

   Mark.

Mark Thomas     \
Computing Year 4 \
Imperial College /
United Kingdom  /  Despite the high cost of living, it remains popular.