含 typeCode 的单例子类抽取出基类

    ————————————————————————————————————————————                                                    ————————————————————
        Singleton1                                                                                      Singleton2
    ————————————————————————————————————————————                                                    ————————————————————
    - singleton1: Singleton1*
    ————————————————————————————————————————————
    + getInstance(): static SingletonDerived1*    ---   if (! singleton1) 
            |                                               singleton1 = new Singleton1(); 
            |                                           return singletonDerived1;
    - Singleton1()                                      
                                                        
    + destoryInstance(): static void              ---   if (Singleton1::singleton1)
        |                                                   delete Singleton1::singleton1;
        |/                                              Singleton1::singleton1 = nullptr;
    + ~Singleton1()
    
    + f(): void
    ————————————————————————————————————————————

                    ——————————————————————————————————————————————————————  
                        Base1                                   
                    ——————————————————————————————————————————————————————  
                    
                    ——————————————————————————————————————————————————————
                    + getInstance(const char* name): static SingletonBase*  --- 
                            |                                                   if (strcmp(name, "SingletonDerived1") == 0)
                            |                                                       return SingletonDerived1::getInstance();
                    # singletonBase()                                           else if (strcmp(name, "SingletonDerived2") == 0)
                                                                                    return SingletonDerived2::getInstance();
                                                                                else 
                                                                                    return nullptr;
                    + destoryInstance(): virtual void           
                    
                    + vf(): virtual void
                    ——————————————————————————————————————————————————————
                        /\                      /\
                       /__\                    /__\
                        |                       |
                        |                       |
                        |                   ——————————————————————
                        |                       Base2                                   
                        |                   ——————————————————————
                        |                   
                        |                   ——————————————————————
                        |                   + vf2(): virtual void
                        |                   ——————————————————————
                        |                           /\
                        |                          /__\
                        |                            |
                        |                            |
                        |                    
————————————————————————————————————————————        ———————————————————
    SingletonDerived1                               SingletonDerived2
————————————————————————————————————————————        ————————————————————
- singletonDerived1: SingletonDerived1*
————————————————————————————————————————————
+ getInstance(): static SingletonDerived1*    ---   if (! singletonDerived1) 
        |                                               singletonDerived1 = new SingletonDerived1(); 
        |                                           return singletonDerived1;
- SingletonDerived1()                                       
                    
+ destoryInstance(): void                       delete singletonDerived1;
            |                                   singletonDerived1 = nullptr;
            |
            |/
+ ~SingletonDerived1()

+ vf(): virtual void
————————————————————————————————————————————

        ————————————————————————————————————————————    
            CManager
        ————————————————————————————————————————————    
_ _ /\   - cLst: std::list<C>                           管理多张 Board1卡(共享1个 单例子类1对象)
|   \/  ————————————————————————————————————————————    
|   
|       ——————|——————————————————————————————————————   
|             |
|           统一销毁 各子类单例
|           SingletonBase::getInstance("SingletonDerived1")->destoryInstance();
|           SingletonBase::getInstance("SingletonDerived2")->destoryInstance();
|
|
|       ————————————————————————————————————————————    
|- - -      C               
        ————————————————————————————————————————————    
         
_ _ /\   - board:    Board*
|   \/  ————————————————————————————————————————————        
|           
|
|       ————————————————————————————————————————————
|_ _ _          Board:接口类 
        ————————————————————————————————————————————
                                                    /\
                                                   /__\
                                                    | |
                                                    | }
                                                   /   \
        ————————————————————————————————————————————        ———————————————————
        Board1                                              Board2
        ————————————————————————————————————————————        ———————————————————
        - singletonBase: SingletonBase*
        ————————————————————————————————————————————
        
        +Rtc5Board()
        —————|———————————————————————————————————————
             |
            singletonBase =  SingletonBase::getInstance("SingletonDerived1")
        

// Base.h
#ifndef SINGLETONBASE_H
#define SINGLETONBASE_H

class Base
{
public:
    // (1) Note1: Base::getInstance()-> Derived::getInstance() -> private Ctor: SingletonDerived1() -> protected Base Ctor: Base() {}
    static Base* getInstance(const char* name);

    virtual void destoryInstance() = 0;

    virtual void vf() = 0;
};

#endif

// Base2.h
#ifndef SINGLETONBASE2_H
#define SINGLETONBASE2_H

#include "Base.h"

class Base2: public Base
{
public:
    virtual void vf2() = 0;
};

#endif

// SingletonDerived1.h
#ifndef SINGLETONDERIVED1_H
#define SINGLETONDERIVED1_H

#include "Base.h"

class SingletonDerived1 : public Base
{
public:
    static SingletonDerived1* getInstance();

    // Note4: destoryInstance() -> Derived::virtial Dtor -> Base:: virtual Dtor
    virtual void destoryInstance();
    virtual ~SingletonDerived1();

    virtual void vf();

private:
    static SingletonDerived1* singletonDerived1;

private:
    SingletonDerived1() { }
};

#endif

// SingletonDerived2.h
// #pragma
#ifndef SINGLETONDERIVED2_H
#define SINGLETONDERIVED2_H

#include "Base2.h"

class SingletonDerived2 : public Base2
{
public:
    static SingletonDerived2* getInstance();
    virtual void destoryInstance();
    virtual ~SingletonDerived2();

    virtual void vf();
    virtual void vf2();
private:
    static SingletonDerived2* singletonDerived2;

    SingletonDerived2() { }
};

#endif

// SingletonDerived1.cpp
#include "SingletonDerived1.h"

#include <iostream>

SingletonDerived1* SingletonDerived1::singletonDerived1 = nullptr;

SingletonDerived1* SingletonDerived1::getInstance()
{
    if (!singletonDerived1)
        singletonDerived1 = new SingletonDerived1();

    return singletonDerived1;
}
void SingletonDerived1::destoryInstance()
{
    if (singletonDerived1)
    {
        delete singletonDerived1;
        singletonDerived1 = nullptr;
    }
}

SingletonDerived1::~SingletonDerived1()
{
    
}

void SingletonDerived1::vf()
{
    std::cout << "SingletonDerived1::vf()\n";
}

// SingletonDerived2.cpp
#include "SingletonDerived2.h"

#include <iostream>

SingletonDerived2* SingletonDerived2::singletonDerived2 = nullptr;

SingletonDerived2* SingletonDerived2::getInstance()
{
    if (!singletonDerived2)
        singletonDerived2 = new SingletonDerived2();

    return singletonDerived2;
}
void SingletonDerived2::destoryInstance()
{
    if (singletonDerived2)
    {
        delete singletonDerived2;
        singletonDerived2 = nullptr;
    }

}
SingletonDerived2::~SingletonDerived2()
{
    
}

void SingletonDerived2::vf()
{
    std::cout << "SingletonDerived2::vf()\n";
}

void SingletonDerived2::vf2()
{
    std::cout << "SingletonDerived2::vf2()\n";
}

// SingletonBaseFactory.cpp
#include "SingletonDerived1.h" // already #include "Base.h"
#include "SingletonDerived2.h" 

#include <cstring>

Base* Base::getInstance(const char* name)
{
    if (strcmp(name, "SingletonDerived1") == 0)
        return SingletonDerived1::getInstance();
    else if (strcmp(name, "SingletonDerived2") == 0)
        return SingletonDerived2::getInstance();
    else
        return nullptr;
}

// main.cpp
#include "Base.h"
#include "Base2.h"

int main()
{
    Base::getInstance("SingletonDerived1")->vf();

    Base::getInstance("SingletonDerived2")->vf();
    if (auto p = dynamic_cast<Base2*>(Base::getInstance("SingletonDerived2") ) )
        p->vf2();

    Base::getInstance("SingletonDerived1")->vf();

    // (5) Note5: 统一销毁各子类单例
    Base::getInstance("SingletonDerived1")->destoryInstance();
    Base::getInstance("SingletonDerived2")->destoryInstance();
}