mruby-set: move #replace to Ruby again

Since it does only clear() and merge(), there is little use of the C
implemented fast path. This change also reduce memory consumption.

mrbgems/mruby-set/mrblib/set.rb

@@ -36,15 +36,8 @@ class Set
   # @param [Enumerable] enum The enumerable object to replace with
   # @return [Set] self
   def replace(enum)
-    if enum.is_a?(Set)
-      # Fast path: Call C-implemented function for Set-to-Set replace
-      __set_replace(enum)
-    else
-      # General path: Clear and add each element from the enumerable
-      clear
-      __do_with_enum(enum) { |o| add(o) }
-      self
-    end
+    clear
+    merge(enum)
   end
 
   # Deletes every element that appears in the given enumerable object and
@@ -152,7 +145,6 @@ class Set
       end
     }
     seen.delete(set.object_id)
-
     self
   end
 
@@ -264,12 +256,10 @@ class Set
   def classify
     return to_enum :classify unless block_given?
     h = {}
-
     each { |i|
       x = yield(i)
       (h[x] ||= self.class.new).add(i)
     }
-
     h
   end
 

mrbgems/mruby-set/src/set.c

@@ -360,32 +360,6 @@ set_delete_p(mrb_state *mrb, mrb_value self)
   }
 }
 
-/*
- * Core implementation of Set-to-Set replace
- * This is an internal method that will be called from Ruby
- */
-static mrb_value
-set_core_replace(mrb_state *mrb, mrb_value self)
-{
-  mrb_value other = mrb_get_arg1(mrb);
-
-  /* Clear the current set */
-  set_clear(mrb, self);
-
-  khash_t(set) *self_kh = set_get_khash(mrb, self);
-  if (!self_kh) {
-    /* If self is empty after clearing, create a new hash */
-    self_kh = kh_init(set, mrb);
-    set_set_khash(mrb, self, self_kh);
-  }
-
-  /* Add all elements from other set */
-  khash_t(set) *other_kh = set_get_khash(mrb, other);
-  set_copy_elements(mrb, self_kh, other_kh);
-
-  return self;
-}
-
 /*
  * Core implementation of Set-to-Set merge (mutating version)
  * This is an internal method that will be called from Ruby
@@ -924,7 +898,6 @@ mrb_mruby_set_gem_init(mrb_state *mrb)
   mrb_define_method(mrb, set, "delete", set_delete, MRB_ARGS_REQ(1));
   mrb_define_method(mrb, set, "delete?", set_delete_p, MRB_ARGS_REQ(1));
 
-  mrb_define_method(mrb, set, "__set_replace", set_core_replace, MRB_ARGS_REQ(1));
   mrb_define_method(mrb, set, "__set_merge", set_core_merge, MRB_ARGS_REQ(1));
   mrb_define_method(mrb, set, "__set_subtract", set_core_subtract, MRB_ARGS_REQ(1));