Bmodel依赖于Amodel，但是Amodel又需要BModel的信息。这样就会导致相互依赖。

方法一：采用静态变量static

链接：C++开发中一个解决方案里，两个项目的相互引用，相互依赖的实现方法（解决方法）_Capricorn_L的博客-CSDN博客

 Amodel
OperationUIManager.h

#pragma once#ifdef AMODEL_EXPORTS
#define AMODEL_API _declspec(dllexport)
#else
#define AMODEL_API _declspec(dllimport)
#endifclass AMODEL_API OperationUIManager
{
public:OperationUIManager() {}
protected:static OperationUIManager* m_pOperationUIManager;
public://将数据加入到提取的图层virtual int Get(int num) = 0;static OperationUIManager* GetManager();
};

 OperationUIManager.cpp

#include "pch.h"
#include "OperationUIManager.h"
OperationUIManager* OperationUIManager::m_pOperationUIManager = NULL;
OperationUIManager* OperationUIManager::GetManager()
{return m_pOperationUIManager;
}

 Bmodel
DesignUIManger.h

#ifdef BMODEL_EXPORTS
#define BMODEL_API _declspec(dllexport)
#else
#define BMODEL_API _declspec(dllimport)
#endifclass  BMODEL_API DesignUIManger :public OperationUIManager
{
public:static DesignUIManger& GetInstance();private:DesignUIManger();DesignUIManger(const DesignUIManger&)=delete;DesignUIManger& operator=(const DesignUIManger&) = delete;
public:virtual int Get(int num);
};

DesignUIManger.cpp 

#include "pch.h"
#include "DesignUIManger.h"DesignUIManger& DesignUIManger::GetInstance()
{static DesignUIManger m_instance;return m_instance;
}int DesignUIManger::Get(int num)
{return num * 10;
}DesignUIManger::DesignUIManger()
{OperationUIManager::m_pOperationUIManager = this;
}DesignUIManger& m_pDesignUIManager = DesignUIManger::GetInstance();

 modelsRelation.cpp (执行 DesignUIManger::GetInstance().Get(10);是为了让程序初始化一下DesignUIManger地址)

方法二：采用函数指针，回调函数

 Amodel

OperationUIManager.h

#include 
#ifdef AMODEL_EXPORTS
#define AMODEL_API _declspec(dllexport)
#else
#define AMODEL_API _declspec(dllimport)
#endifusing Getfun = std::function;extern "C"	//以"C"的方式导出接口
{extern AMODEL_API Getfun GetCurDb;
}

 OperationUIManager.cpp

#include "OperationUIManager.h"Getfun GetCurDb = nullptr;

  Bmodel
DesignUIManger.h

#include "SingletonInterface.h"#ifdef BMODEL_EXPORTS
#define BMODEL_API _declspec(dllexport)
#else
#define BMODEL_API _declspec(dllimport)
#endifBMODEL_API void Init();

 DesignUIManger.cpp

#include "DesignUIManger.h"
#include "../AModel/OperationUIManager.h"int Get1(int num) { return num * 2; };void Init()
{GetCurDb = Get1;
}

  modelsRelation.cpp (执行 init;是为了让程序初始化一下)

#include 
#include "../AModel/OperationUIManager.h"#include "../BModel/DesignUIManger.h"
using namespace std;
int main()
{Init();if (GetCurDb){cout << GetCurDb(10) << endl;}
}