令狐冲之独孤九剑篇--策略模式

三叶草

策略模式
《独孤九剑》在金庸小说《神雕侠侣》、《笑傲江湖》中提到 为「剑魔」独孤求败所创，以无招胜有招，杀尽仇寇，败尽英 雄，天下更无抗手，唯隐居深谷以雕为友，『呜呼！群雄束手，长剑空利，不亦悲夫！生平欲求敌手，而不可得，诚寂寥难堪也』最后埋剑空谷，茕茕了此一生。
做技术的多么渴望这种状态，慢慢磨炼自己的功夫，笔者少年也是个功夫迷，并且相信轻功的存在，学校中，反复跳上乒乓球台，锤炼轻功；村子里，来回助跑，废弃的老墙蹬倒了好几堵。
现在做技术了，这种心态还在，感觉只要不停的学习锤炼，就能疾风快马，仗剑天涯。
本系列为新编系列，通过武侠小说，《西游记》，《龙珠》等门派关系，师徒关系，功夫继承，来解释设计模式，而且代码极简，以表达设计模式的思想为主。
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场景：《独孤九剑》分为九种剑术，这里列举三种作为三种子类，这三种类都属于继承自《独孤九剑》类
Book_up <<独孤九剑>>
Book_A  <<破剑术>>
Book_B  <<破暗器术>>
Book_C  <<破刀术>>
Fox_punching：令狐冲

: Strategy.o
  g++ -o Exe Strategy.o
main.o : Strategy.cpp
  g++ -g -c Strategy.cpp
clean :
  rm Strategy

#include <iostream>
#include <string>
using namespace std;
//策略模式
enum Type
{
A,
B,
C
};
class Book_up //<<独孤九剑>>
{
public:
  virtual void show_skill() = 0;
};
class Book_A : public Book_up
{
  public:
  void show_skill();
};
void Book_A::show_skill()
{
  cout << "Sword breaking skill" << endl;
}
class Book_B : public Book_up
{
public:
  void show_skill();
};
void Book_B::show_skill()
{
  cout << "Hidden weapon breaking skill" << endl;
}
class Book_C : public Book_up
{
public:
  void show_skill();
};
void Book_C::show_skill()
{
  cout << "knife breaking skill" << endl;
}
class Fox_punching
{
public:
  Book_up* p_Bool_up = NULL; //<<独孤九剑>>
  Book_A* p_Book_A = NULL; //<<破剑术>>
  Book_B* p_Book_B = NULL;//<<破暗器术>>
  Book_C* p_Book_C = NULL;//<<破刀术>>
  void read_book(Type type);
  void throw_skill();
  ~Fox_punching();
};
  Fox_punching::~Fox_punching()
  {
    if(p_Book_A != NULL)
    {
      delete p_Book_A;
    }
    if(p_Book_B != NULL)
    {
      delete p_Book_B;
    }
    if(p_Book_C != NULL)
    {
      delete p_Book_C;
    }
  }
void Fox_punching::read_book(Type type)
{
  if (type == A)
  {
    if (p_Book_A == NULL)
    {
      p_Bool_up = new Book_A;
    }
  }
  if(type == B)
  {
    if(p_Book_B == NULL)
    {
      p_Bool_up = new Book_B;
    }
  }
  if (type == C)
  {
    if (p_Book_C == NULL)
    {
      p_Bool_up = new Book_C;
    }
  }
}
void Fox_punching::throw_skill()
{
  cout << "be careful" << endl;
  p_Bool_up->show_skill();
}
int main(void)
{
  //<<破剑术>>
  Fox_punching* p_Fox_punching = new Fox_punching;
  p_Fox_punching->read_book(Type::A);
  p_Fox_punching->throw_skill();
  //<<破暗器术>>
  p_Fox_punching->read_book(Type::B);
  p_Fox_punching->throw_skill();
  //<<破刀术>>
  p_Fox_punching->read_book(Type::C);
  p_Fox_punching->throw_skill();
  delete p_Fox_punching;
  return 0;
}

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