method

instance_variables

v1_8_7_72 - Show latest stable - 0 notes - Class: Object

instance_variables() public

Returns an array of instance variable names for the receiver. Note that simply defining an accessor does not create the corresponding instance variable.

   class Fred
     attr_accessor :a1
     def initialize
       @iv = 3
     end
   end
   Fred.new.instance_variables   #=> ["@iv"]

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/*
 *  call-seq:
 *     obj.instance_variables    => array
 *  
 *  Returns an array of instance variable names for the receiver. Note
 *  that simply defining an accessor does not create the corresponding
 *  instance variable.
 *     
 *     class Fred
 *       attr_accessor :a1
 *       def initialize
 *         @iv = 3
 *       end
 *     end
 *     Fred.new.instance_variables   #=> ["@iv"]
 */

VALUE
rb_obj_instance_variables(obj)
    VALUE obj;
{
    VALUE ary;

    ary = rb_ary_new();
    switch (TYPE(obj)) {
      case T_OBJECT:
      case T_CLASS:
      case T_MODULE:
	if (ROBJECT(obj)->iv_tbl) {
	    st_foreach_safe(ROBJECT(obj)->iv_tbl, ivar_i, ary);
	}
	break;
      default:
	if (!generic_iv_tbl) break;
	if (FL_TEST(obj, FL_EXIVAR) || rb_special_const_p(obj)) {
	    st_data_t tbl;

	    if (st_lookup(generic_iv_tbl, obj, &tbl)) {
		st_foreach_safe((st_table *)tbl, ivar_i, ary);
	    }
	}
	break;
    }
    return ary;
}

instance_variables

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