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Please excuse my ignorance, but can someone tell me whether the code here, inside the "#ifdef __cplusplus" conditional, is actually valid C++? If so, that is some of the strangest syntax I've ever seen --- can you really put a conditional which tests the values of macro arguments on the *outside* of the macro? The scope of a macro's arguments extends beyond its definition... Or was the author just feeling Martian that day? #ifndef SCM_MAGIC_SNARFER #define SCM_PROC(RANAME, STR, REQ, OPT, VAR, CFN) \ static char RANAME[]=STR #define SCM_PROC1(RANAME, STR, TYPE, CFN) \ static char RANAME[]=STR #else #ifdef __cplusplus #if REQ == 0 && OPT == 0 && VAR == 0 #define SCM_PROC(RANAME, STR, REQ, OPT, VAR, CFN) \ %%% scm_make_gsubr (RANAME, REQ, OPT, VAR, (SCM (*) (void)) CFN) #else #define SCM_PROC(RANAME, STR, REQ, OPT, VAR, CFN) \ %%% scm_make_gsubr (RANAME, REQ, OPT, VAR, (SCM (*) (SCM, ...)) CFN) #endif #if TYPE == scm_tc7_subr_0 #define SCM_PROC1(RANAME, STR, TYPE, CFN) \ %%% scm_make_subr(RANAME, TYPE, (SCM (*)(void)) CFN) #else #define SCM_PROC1(RANAME, STR, TYPE, CFN) \ %%% scm_make_subr(RANAME, TYPE, (SCM (*)(...)) CFN) #endif #else /* __cplusplus */ #define SCM_PROC(RANAME, STR, REQ, OPT, VAR, CFN) \ %%% scm_make_gsubr (RANAME, REQ, OPT, VAR, CFN) #define SCM_PROC1(RANAME, STR, TYPE, CFN) \ %%% scm_make_subr(RANAME, TYPE, CFN) #endif /* __cplusplus */ #endif