kernel.c (mrb_cmp_m): implement `Kernel#<=>`
MODIFY
src/kernel.c
src/kernel.c
@@ -78,6 +78,16 @@ mrb_equal_m(mrb_state *mrb, mrb_value self)
return mrb_bool_value(mrb_equal(mrb, self, arg));
}
+static mrb_value
+mrb_cmp_m(mrb_state *mrb, mrb_value self)
+{
+ mrb_value arg = mrb_get_arg1(mrb);
+
+ if (mrb_obj_equal(mrb, self, arg))
+ return mrb_fixnum_value(0);
+ return mrb_nil_value();
+}
+
/* 15.3.1.3.3 */
/* 15.3.1.3.33 */
/*
@@ -534,6 +544,7 @@ mrb_init_kernel(mrb_state *mrb)
mrb_define_method(mrb, krn, "===", mrb_equal_m, MRB_ARGS_REQ(1)); /* 15.3.1.3.2 */
+ mrb_define_method(mrb, krn, "<=>", mrb_cmp_m, MRB_ARGS_REQ(1));
mrb_define_method(mrb, krn, "block_given?", mrb_f_block_given_p_m, MRB_ARGS_NONE()); /* 15.3.1.3.6 */
mrb_define_method(mrb, krn, "class", mrb_obj_class_m, MRB_ARGS_NONE()); /* 15.3.1.3.7 */
mrb_define_method(mrb, krn, "clone", mrb_obj_clone, MRB_ARGS_NONE()); /* 15.3.1.3.8 */

kernel.c (mrb_cmp_m): implement `Kernel#<=>`