Add explicit cast to `DROP_PRECISION` macro in `rtional.c`.

mrbgems/mruby-rational/src/rational.c

@@ -91,9 +91,9 @@ rational_s_new(mrb_state *mrb, mrb_value self)
   mrb_get_args(mrb, "ii", &numerator, &denominator);
 #else
 
-#define DROP_PRECISION(cond, num, denom) \
+#define DROP_PRECISION(f, num, denom) \
   do { \
-      while (cond) { \
+      while (f < (mrb_float)MRB_INT_MIN || f > (mrb_float)MRB_INT_MAX) { \
         num /= 2; \
         denom /= 2; \
       } \
@@ -111,7 +111,7 @@ rational_s_new(mrb_state *mrb, mrb_value self)
     else {
       mrb_float denomf = mrb_to_flo(mrb, denomv);
 
-      DROP_PRECISION(denomf < MRB_INT_MIN || denomf > MRB_INT_MAX, numerator, denomf);
+      DROP_PRECISION(denomf, numerator, denomf);
       denominator = (mrb_int)denomf;
     }
   }
@@ -124,11 +124,11 @@ rational_s_new(mrb_state *mrb, mrb_value self)
     else {
       mrb_float denomf = mrb_to_flo(mrb, denomv);
 
-      DROP_PRECISION(denomf < MRB_INT_MIN || denomf > MRB_INT_MAX, numf, denomf);
+      DROP_PRECISION(denomf, numf, denomf);
       denominator = (mrb_int)denomf;
     }
 
-    DROP_PRECISION(numf < MRB_INT_MIN || numf > MRB_INT_MAX, numf, denominator);
+    DROP_PRECISION(numf, numf, denominator);
     numerator = (mrb_int)numf;
   }
 #endif
@@ -152,7 +152,7 @@ rational_to_i(mrb_state *mrb, mrb_value self)
 {
   struct mrb_rational *p = rational_ptr(mrb, self);
   if (p->denominator == 0) {
-    mrb_raise(mrb, mrb_exc_get(mrb, "StandardError"), "divided by 0");
+    mrb_raise(mrb, mrb->eStandardError_class, "divided by 0");
   }
   return mrb_fixnum_value(p->numerator / p->denominator);
 }