More C++ compilability work: mrb_obj_alloc void* conversions

One of the biggest set of changes needed to make C++ compile, is that you
can't autoconvert "void*" to a different pointer type without a cast (you
can of course, convert pointers *to* "void*"!)

For the first part, convert the users of "mrb_obj_alloc".  Since it has
to return something, make it RBasic* (that's what mrb_obj_alloc() is
operating on anyway).  This way, even in C you'll get a warning if you
don't cast it.

For places where there are a lot of similar calls to mrb_obj_alloc(),
this can be easily hidden through a macro.  I did this in string.c:
    #define mrb_obj_alloc_string(mrb) ((struct RString *) mrb_obj_alloc((mrb), MRB_TT_STRING, (mrb)->string_class))

I also updated the mrb_object() macro to also return a RBasic* -- my
previous commit changed that from "void*" -> "RObject*", but I figure
it should be consistent with mrb_obj_alloc()

1 files changed, 1 insertions, 1 deletions

diff --git a/src/range.c b/src/range.c
index 14024f29b..1ec9f59ef 100644
--- a/src/range.c
+++ b/src/range.c
@@ -37,7 +37,7 @@ mrb_range_new(mrb_state *mrb, mrb_value beg, mrb_value end, int excl)
 {
   struct RRange *r;
 
-  r = mrb_obj_alloc(mrb, MRB_TT_RANGE, RANGE_CLASS);
+  r = (struct RRange *) mrb_obj_alloc(mrb, MRB_TT_RANGE, RANGE_CLASS);
   r->edges = mrb_malloc(mrb, sizeof(struct mrb_range_edges));
   r->edges->beg = beg;
   r->edges->end = end;