MAKE_VERSION man page

MAKE_VERSION — Create a 32 bit integer from the Allegro version

Synopsis

#include <allegro.h>

Macro MAKE_VERSION(a, b, c)

Description

This macro can be used to check if some Allegro version is (binary) compatible with the current version. It is safe to use > and < to check if one version is more recent than another. The third number is ignored if the second number is even, so MAKE_VERSION(4, 2, 0) is equivalent to MAKE_VERSION(4, 2, 1). This is because of our version numbering policy since 4.0.0: the second number is even for stable releases, which must be ABI-compatible with earlier versions of the same series. This macro is mainly useful for addon packages and libraries. See the  `ABI compatibility information' section of the manual for more detailed  information. Example:

   /* Check if the current version is compatible with Allegro 4.2.0 */
   #if (MAKE_VERSION(4, 2, 0) <= MAKE_VERSION(ALLEGRO_VERSION, \
                      ALLEGRO_SUB_VERSION, ALLEGRO_WIP_VERSION))
      /* Allegro 4.2.0 compatibility */
   #else
      /* Work-around */
   #endif

See Also

ALLEGRO_VERSION(3), ALLEGRO_SUB_VERSION(3), ALLEGRO_WIP_VERSION(3)

Info

version 4.4.2 Allegro manual