instance_of?

/*
 *  call-seq:
 *     obj.instance_of?(class)    => true or false
 *  
 *  Returns <code>true</code> if <i>obj</i> is an instance of the given
 *  class. See also <code>Object#kind_of?</code>.
 */

VALUE
rb_obj_is_instance_of(obj, c)
    VALUE obj, c;
{
    switch (TYPE(c)) {
      case T_MODULE:
      case T_CLASS:
      case T_ICLASS:
        break;
      default:
        rb_raise(rb_eTypeError, "class or module required");
    }

    if (rb_obj_class(obj) == c) return Qtrue;
    return Qfalse;
}