/*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2015 Paul Sokolovsky
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #include <stdlib.h>
  
  #include "py/runtime.h"
  
  // This is universal iterator type which calls "iternext" method stored in
  // particular object instance. (So, each instance of this time can have its
  // own iteration behavior.) Having this type saves to define type objects
  // for various internal iterator objects.
  
  // Any instance should have these 2 fields at the beginning
  typedef struct _mp_obj_polymorph_iter_t {
      mp_obj_base_t base;
      mp_fun_1_t iternext;
  } mp_obj_polymorph_iter_t;
  
  STATIC mp_obj_t polymorph_it_iternext(mp_obj_t self_in) {
      mp_obj_polymorph_iter_t *self = MP_OBJ_TO_PTR(self_in);
      // Redirect call to object instance's iternext method
      return self->iternext(self_in);
  }
  
  const mp_obj_type_t mp_type_polymorph_iter = {
      { &mp_type_type },
      .name = MP_QSTR_iterator,
      .getiter = mp_identity_getiter,
      .iternext = polymorph_it_iternext,
  };