前言

主函数

SimpleFactoryRefactor.cpp

#include <iostream>
#include<string>
#include "DynOBJ.h"
#include "get_config.h"
using namespace std;
#define CFG_FILE_PATH "test.cfg"class Api {
public:virtual void test(string) = 0;
protected:Api(){}
};class ImpleOne :public Api {
public:void test(string s){cout << "现在是One在执行" << s;}
};class ImpleTwo :public Api {
public:void test(string s){cout << "现在是Two在执行" << s;}
};REG_CLASS(ImpleTwo)
REG_CLASS(ImpleOne)class ConfigOperator{
public:ConfigOperator(string path){ this->cfgPath = path;//-----------------------------通过cfg文件中的配置信息，来确定代码运行那一部分下//----------------------------读取配置文件，确定运行内容，↓map<string, string> m;ReadConfig(CFG_FILE_PATH, m);/**************************读取配置文件↑***************************///PrintConfig(m);//——————————————解析内容(1)获得参数个数(2)获得参数值下Numb = m.find("AddClassNumb")->second;//找到的是key，那么它的下一个就是value了Class = m.find("ClassFirst")->second;//};~ConfigOperator(){};string GetOperatorClassName(){ return this->Class; };private: string cfgPath;string  Numb;string  Class;};class AutoFactory{
public:static Api* createApi(){string OperatorClassName;//获得配置文件的运行操作内容ConfigOperator* cfgOp = new ConfigOperator(CFG_FILE_PATH);OperatorClassName = cfgOp->GetOperatorClassName();//-----------------------------运行完全高层、抽象的内容↓Api *pApi = nullptr;pApi = static_cast<Api*>(CObjectFactory::creatObject(OperatorClassName));return pApi;}
};int main(void)
{ Api* pApi = AutoFactory::createApi(); pApi->test("完全实现客户端的分离！即，调用者和实际工作者的划分");system("pause");return 0;
}//--------------代码运行中的不同阶段//class ImpleTwoHelper
//{
//public:
//  ImpleTwoHelper(){
//      CObjectFactory::registerClass("ImpleTwo", ImpleTwoHelper::createObjFunc);
//
//  }
//  static void *createObjFunc(){
//      return new ImpleTwo;
//  }
//};
//int main2(void)
//{
//  ImpleTwo*pTwo = static_cast<ImpleTwo*>(ImpleTwoHelper::createObjFunc());
//
//  pTwo->test("测试动态创建Two！");
//  system("pause");
//  return 0;
//}
//int main1(void)
//{
//  ImpleOne* pOne = static_cast<ImpleOne*>(CObjectFactory::creatObject("ImpleOne"));
//
//  pOne->test("RegClass");
//  system("pause");
//  return 0;
//}

DynOBJ.h

#ifndef DYNOBJ_H_
#define DYNOBJ_H_
#include<string>
#include<map>
typedef void*(*Constructor)();
class CObjectFactory{
public:static void registerClass(std::string className, Constructor constructor)   {constructors()[className] = constructor;}static void* creatObject(const std::string& className) {Constructor constructor = NULL;if (constructors().find(className) != constructors().end())//查找map中key为classname的一个元素，如果找到了{constructor = constructors().find(className)->second;//找到的是key，那么它的下一个就是value了}if (constructor == NULL){return NULL;}return(*constructor)();}
private://string->key:动态创建的类的类名，value是构建inline static std::map<std::string,Constructor>&constructors(){static std::map<std::string,Constructor> instance;return instance;}
};#define REG_CLASS(class_name)\
class class_name##Helper\
{\
public:\class_name##Helper(){\CObjectFactory::registerClass(#class_name, class_name##Helper::createObjFunc);\}\static void *createObjFunc(){\return new class_name;\}\
};\
class_name##Helper class_name##helper;\//#define REG_CLASS(class_name) \
//class class_name##Helper\
//{\
//public:\
//  class_name##Helper(){\
//      CObjectFactory::registerClass(#class_name,  class_name##Helper::createObjFunc);\
//  };\
//  static void* createObjFunc(){\
//      return new class_name;\
//  };\
//};\
//class_name##Helper class_name##Helper;\#endif // !DYNOBJ_H_
//
//class ImpleOneHelper{ public: ImpleOneHelper(){ CObjectFactory::registerClass("ImpleOne", ImpleOneHelper::createObjFunc); }; static void* create0bjFunc(){ return new ImpleOne; }; }; ImpleOneHelper ImpleOneHelper;

/****************************************************************************
*   作者:  董康乐
*   日期:  2022年1月23日14:59:24
*   目的:  读取配置文件的信息，以map的形式存入
*   要求:  配置文件的格式，以#作为行注释，配置的形式是key = value，中间可有空格，也可没有空格
*****************************************************************************/
#ifndef _GET_CONFIG_H_
#define _GET_CONFIG_H_#include <string>
#include <map>
using namespace std;#define COMMENT_CHAR '#'bool ReadConfig(const string & filename, map<string, string> & m);
void PrintConfig(const map<string, string> & m);
#endif

#include "get_config.h"#include <fstream>
#include <iostream>
using namespace std;bool IsSpace(char c)
{if (' ' == c || '\t' == c)return true;return false;
}bool IsCommentChar(char c)
{switch (c) {case COMMENT_CHAR:return true;default:return false;}
}void Trim(string & str)
{if (str.empty()) {return;}int i, start_pos, end_pos;for (i = 0; i < str.size(); ++i) {if (!IsSpace(str[i])) {break;}}if (i == str.size()) { // 全部是空白字符串str = "";return;}start_pos = i;for (i = str.size() - 1; i >= 0; --i) {if (!IsSpace(str[i])) {break;}}end_pos = i;str = str.substr(start_pos, end_pos - start_pos + 1);
}bool AnalyseLine(const string & line, string & key, string & value)
{if (line.empty())return false;int start_pos = 0, end_pos = line.size() - 1, pos;if ((pos = line.find(COMMENT_CHAR)) != -1) {if (0 == pos) {  // 行的第一个字符就是注释字符return false;}end_pos = pos - 1;}string new_line = line.substr(start_pos, start_pos + 1 - end_pos);  // 预处理，删除注释部分if ((pos = new_line.find('=')) == -1)return false;  // 没有=号key = new_line.substr(0, pos);value = new_line.substr(pos + 1, end_pos + 1 - (pos + 1));Trim(key);if (key.empty()) {return false;}Trim(value);return true;
}bool ReadConfig(const string & filename, map<string, string> & m)
{m.clear();ifstream infile(filename.c_str());if (!infile) {cout << "file open error" << endl;return false;}string line, key, value;while (getline(infile, line)) {if (AnalyseLine(line, key, value)) {m[key] = value;}}infile.close();return true;
}void PrintConfig(const map<string, string> & m)
{map<string, string>::const_iterator mite = m.begin();for (; mite != m.end(); ++mite) {cout << mite->first << "=" << mite->second << endl;}
}

配置文件格式：test.cfg

AddClassNumb = 2
ClassFirst  =    ImpleTwo
ClassSecond  =    ImpleTwo
#sdf

参考文献

工厂模式https://blog.csdn.net/a844651990/article/details/84392410配置文件配置文件https://www.cnblogs.com/shanlizi/p/6912976.htmlhttps://edu.csdn.net/course/detail/8482