[Scwm-devs] question about VALIDATE macros

[Scott L. <sl...@cs...>]

Greg,

In the validate macros such as:

#define VALIDATE_WIN_USE_CONTEXT(win) \
  do { if ((win = ensure_valid(win,1,FUNC_NAME, SCM_BOOL_T, SCM_BOOL_F)) == 
SCM_BOOL_F) \
          return SCM_BOOL_F; } while (0)

Why do they all have a do { } while(0) around the code?

Thanks.

- Scott