Loki::AbstractFactoryをBoost.MPLで書く

[]// abstract_factory.cpp : コンソール アプリケーションのエントリ ポイントを定義します。[]

[]//[]
[]#include[][] "stdafx.h"[]
[]#include[][] <boost/mpl/identity.hpp>[]

[]#include[][] <boost/mpl/inherit.hpp>[]

[]#include[][] <boost/mpl/inherit_linearly.hpp>[]

[]#include[][] <boost/mpl/bind.hpp>[]

[]#include[][] <boost/mpl/vector.hpp>[]

[]#include[][] <boost/mpl/quote.hpp>[]

[]#include[][] <boost/mpl/pop_front.hpp>[]

[]#include[][] <boost/mpl/front.hpp>[]

[]#include[][] <boost/mpl/lambda.hpp>[]
[]#include[][] <iostream>[]
[]// See: Modern C++ Design/Chapter9[]
[]namespace[] []pst_2005_03_17[] {

  []using[] []namespace[] []std[];

  []namespace[] []bst[] = []boost[];

  []namespace[] []mpl[] = []boost[]::[]mpl[];

  []using[] []mpl[]::[]_[]; []using[] []mpl[]::[]_1[]; []using[] []mpl[]::[]_2[];
  []template[]< []class[] []T[] >

  []struct[] []abstract_factory_unit_[]

  {

    []virtual[] []T[]* []do_create[]([]mpl[]::[]identity[]<[]T[]>) = 0;

    []virtual[] ~[]abstract_factory_unit_[]() { }

  };
  []// Note: mpl::quote creates MetafunctionClass from Metafunction[]

  []//       looking better than "abstract_factory_unit_<_>"[]

  []typedef[] []mpl[]::[]quote1[]<[]abstract_factory_unit_[]> []abstract_factory_unit[];

  []// typedef abstract_factory_unit_<_> abstract_factory_unit; also OK[]

  

  []// abstract_factroy[]

  []// ProductList  : ForwardSequence[]

  []// Unit         : UnaryMetafunctionClass[]

  []template[]< []class[] []ProductList[], []class[] []Unit[] = []abstract_factory_unit[] >

  []struct[] []abstract_factory[]

    : []mpl[]::[]inherit_linearly[]<

        []ProductList[],

        []// mpl::lambda makes LambdaExpression acceptable[]

        []mpl[]::[]inherit2[]< []_1[], []mpl[]::[]bind1[]<[]typename[] []mpl[]::[]lambda[]<[]Unit[]>::[]type[], []_2[]> >

      >::[]type[]

  {

    []typedef[] []ProductList[] []product_list[];

    []template[]< []class[] []T[] >

    []T[]* []create[]() {

      []// ambiguity buster[]

      []typedef[] []typename[] []mpl[]::[]apply[]<[]Unit[],[]T[]>::[]type[] []unit_type[];

      []unit_type[]& []unit_[](*[]this[]);

      []return[] []unit_[].[]do_create[]([]mpl[]::[]identity[]<[]T[]>());

    }

  };
  []template[]< []class[] []ConcreateProduct[], []class[] []Base[] >

  []struct[] []op_new_factory_unit_[] : []Base[]

  {

    []// Note: You can't omit "type" typedef, because[]

    []//       Base=abstract_factory=mpl::inherit2 returned from mpl::inherit_linerly,[]

    []//       and mpl::inherit2 is a Metafunction returning itself![]

    []typedef[] []op_new_factory_unit_[] []type[];

  []private[]:

    []typedef[] []typename[] []Base[]::[]product_list[] []base_product_list[];

  []protected[]:

    []typedef[] []typename[] []mpl[]::[]pop_front[]<[]base_product_list[]>::[]type[] []product_list[];

  []public[]:

    []typedef[] []typename[] []mpl[]::[]front[]<[]base_product_list[]>::[]type[] []abstract_product[];

    []// override[]

    []virtual[] []abstract_product[]* []do_create[]([]mpl[]::[]identity[]<[]abstract_product[]>) {

      []return[] []new[] []ConcreateProduct[]();

    }

  };
  []typedef[] []mpl[]::[]quote2[]<[]op_new_factory_unit_[]> []op_new_factory_unit[];

  []// typedef op_new_factory_unit_<_,_> op_new_factory_unit; also possible[]

  

  []// concrete_factory[]

  []//   OpNewFactoryUnit     : BinaryMetafunctionClass[]

  []//   ConcreteProductList  : ForwardSequence[]

  []template[]<

    []class[] []AbstractFactory[],

    []class[] []OpNewFactoryUnit[] = []op_new_factory_unit[],

    []class[] []ConcreteProductList[] = []typename[] []AbstractFactory[]::[]product_list[]

  >

  []struct[] []concreate_factory[]

    : []mpl[]::[]inherit_linearly[]<

        []ConcreteProductList[],

        []mpl[]::[]bind2[]<[]typename[] []mpl[]::[]lambda[]<[]OpNewFactoryUnit[]>::[]type[],[]_2[],[]_1[]>,

        []AbstractFactory[] []// Root[]

      >::[]type[]

  { };

  

  []// base enemies[]

  []struct[] []soldier[] { []virtual[] []void[] []kick[]() = 0; };

  []struct[] []monster[] { []virtual[] []void[] []scratch[]() = 0; };

  []struct[] []super_monster[] { []virtual[] []void[] []brast[]() = 0; };
  []// the abstract factory[]

  []typedef[] []mpl[]::[]vector[]<[]soldier[], []monster[], []super_monster[]> []base_enemy_list[];

  []typedef[] []abstract_factory[]<[]base_enemy_list[]> []abstract_enemy_factory[];
  []// easy level enemies[]

  []struct[] []silly_soldier[] : []soldier[] { []virtual[] []void[] []kick[]() { []wcout[] << []L[][]"silly kick"[] << []endl[]; } };

  []struct[] []silly_monster[] : []monster[] { []virtual[] []void[] []scratch[]() { []wcout[] << []L[][]"silly scratching"[] << []endl[]; } };

  []struct[] []silly_super_monster[] : []super_monster[] { []virtual[] []void[] []brast[]() { []wcout[] << []L[][]"silly brast"[] << []endl[]; } };
  []// easy level concrete factory []

  []typedef[] []mpl[]::[]vector[]<[]silly_soldier[], []silly_monster[], []silly_super_monster[]> []silly_enemy_list[];

  []typedef[] []concreate_factory[]<[]abstract_enemy_factory[], []op_new_factory_unit[], []silly_enemy_list[]> []easy_level_enemy_factory[];
  []// hard level enemies[]

  []struct[] []awesome_soldier[] : []soldier[] { []virtual[] []void[] []kick[]() { []wcout[] << []L[][]"awesome kick"[] << []endl[]; } };

  []struct[] []awesome_monster[] : []monster[] { []virtual[] []void[] []scratch[]() { []wcout[] << []L[][]"awesome scratching"[] << []endl[]; } };

  []struct[] []awesome_super_monster[] : []super_monster[] { []virtual[] []void[] []brast[]() { []wcout[] << []L[][]"awesome brast"[] << []endl[]; } };
  []// hard level concrete factory[]

  []typedef[] []mpl[]::[]vector[]<[]awesome_soldier[], []awesome_monster[], []awesome_super_monster[]> []awesome_enemy_list[];

  []typedef[] []concreate_factory[]<[]abstract_enemy_factory[], []op_new_factory_unit[], []awesome_enemy_list[]> []hard_level_enemy_factory[];
  []// test[]

  []void[] []test[]() {

    []bool[] []hard[] = []true[];
    []abstract_enemy_factory[]* []p_factory[];

    []if[] ([]hard[])

      []p_factory[] = []new[] []hard_level_enemy_factory[]();

    []else[]

      []p_factory[] = []new[] []easy_level_enemy_factory[]();

    []/* ... */[]
    []soldier[]* []p_mummy[] = []p_factory[]->[]create[]<[]soldier[]>();

    []p_mummy[]->[]kick[]();
    []monster[]* []p_orga[] = []p_factory[]->[]create[]<[]monster[]>();

    []p_orga[]->[]scratch[]();
    []/* ... */[]

  }

} []// namespace pst_2005_03_17[]


[]int[] []_tmain[]([]int[] []argc[], []_TCHAR[]* []argv[][])

{

  []pst_2005_03_17[]::[]test[]();

  []wcin[].[]ignore[]();

  []return[] 0;

}