mruby/mruby — pull request #171 by mitchblank (2012-05-20 16:59:12+00:00)
Title: 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()