我对工厂模式有疑问。我编写了一个工厂,它有一个名为registerIt的静态函数。它接受类名的字符串和指向任何类的创建者函数的指针。
static void CharacterFactory::registerit(const std::string& classname, Creator creator)
{
table[classname] = creator;
}
表格是
std::map<std::string, CharacterFactory::Creator> CharacterFactory::table;
创作者
typedef std::auto_ptr<Actor> Type;
typedef Type (*Creator)();
Actor是Base类
类本身具有注册功能。例如“Player”类
static void registerToFactory(){
CharacterFactory::registerit("Player",&create);
std::cout<<"player created"<<std::endl;
}
我的问题是,如何告诉类将自己注册到静态工厂?如果我在主类中调用registerToFactory,一切正常。但我想更动态地完成它,所以我只需要在新类中更改代码,而不是在我的代码中更改。
以下整个代码:
Factory.h:
#pragma once
#include "Actor.h"
#include <string>
#include<map>
namespace Character{
class Actor;
class CharacterFactory
{
public:
typedef std::auto_ptr<Actor> Type;
typedef Type (*Creator)();
CharacterFactory(void);
~CharacterFactory(void);
Type create(const std::string& classname);
static void registerit(const std::string& classname, Creator creator);
private:
static std::map<std::string, Creator> table;
};
}
演员:
#pragma once
#include<string>
#include"CharacterFactory.h"
#include<iostream>
namespace Character{
class Actor
{
public:
static Actor* create(){std::cout<<"dummy"<<std::endl;return NULL;};
static Actor* create(int dmg){std::cout<<"dummy"<<std::endl;return NULL;};
Actor(void):damage(0),healthPoints(0),lastUpdate(0){};
Actor(int dmg):damage(dmg){};
~Actor(void);
virtual void update(void)=0;
virtual void update(int deltaMillis)=0;
protected:
int lastUpdate;
//Attribute
int healthPoints;
int damage;
//Amor amor;
//Weapon weapon;
//Ai ai;
//Networking
};
}
播放器:
#pragma once
#include "Actor.h"
#include <stdio.h>
#include "CharacterFactory.h"
namespace Character{
#ifndef PLAYER_H
#define PLAYER_H
class Player:public Actor
{
public:
void update(void){};
void update(int deltaMillis){};
static std::auto_ptr<Actor> create(){
return std::auto_ptr<Actor>(new Player);
}
Player(void);
~Player(void);
static void registerToFactory(){
CharacterFactory::registerit("Player",&create);
std::cout<<"player created"<<std::endl;
}
inline int getDamage(void){ return damage;};
};
#endif
}
我希望你能帮助我:)。
答案 0 :(得分:1)
您可以使用构造函数或动态初始化表达式作为静态变量,编译器将确保在调用main()
之前运行。