c++ - 在 C++ 中，如何有效地在两个类之间共享数据？

Question

#include "dataConsumer.h"

#include <iostream>
#include <Windows.h>

DataConsumer::DataConsumer(){}
DataConsumer::~DataConsumer(){}

void DataConsumer::Body()
{
    std::cout << "DataConsumer Start" << std::endl;

    while (1)
    {
        //I want to get providerData_ of DataProvide class in here

        Sleep(1000);
    }
}


#include "dataProvider.h"

#include <iostream>
#include <Windows.h>

DataProvider::DataProvider(){}
DataProvider::~DataProvider(){}

void DataProvider::Body()
{
    std::cout << "DataProvider Start" << std::endl;

    while (1)
    {
        //Update data in here
        providerData_++;

        Sleep(1000);
    }
}

有两个类。我想在 dataConsumer 类中获取 dataProvider 类的 providerData_。

为了解决这种情况，我认为以下是一种解决方案。我制作了如下所示的单例数据传输类。但我不确定这是否是 c++ 中的通用解决方案。首先，我想知道我的解决方案是否可用。接下来，如果您知道更好的解决方案(或设计模式)来解决我的情况，请告诉我。

#ifndef DATATRANSFER_H
#define DATATRANSFER_H

class DataTransfer
{
public:
    static DataTransfer* getInstance()
    {
        static DataTransfer instance;
        return &instance;
    }
    void GetData(unsigned int *data)
    { 
        if(data)
            *data = data_;
    }
    void SetData(unsigned int *data)
    { 
        if(data)
            data_ = *data;
    }

private:
    DataTransfer(){}
    ~DataTransfer(){}

    unsigned int data_;
};

#endif


#include "dataConsumer.h"
#include "dataTransfer.h"

#include 
#include 

DataConsumer::DataConsumer(){}
DataConsumer::~DataConsumer(){}

void DataConsumer::Body()
{
    unsigned int data = 0;
    std::cout << "DataConsumer Start" << std::endl;

    while (1)
    {
        //I want to get providerData_ of DataProvide class in here
        DataTransfer::getInstance()->GetData(&data);

        std::cout << "DataConsumer data:" << data << std::endl;

        Sleep(1000);
    }
}

#include "dataProvider.h"
#include "dataTransfer.h"

#include 
#include 

DataProvider::DataProvider() : providerData_(0)
{
}

DataProvider::~DataProvider(){}

void DataProvider::Body()
{
    std::cout << "DataProvider Start" << std::endl;

    while (1)
    {
        //Update data in here
        providerData_++;

        DataTransfer::getInstance()->SetData(&providerData_);

        Sleep(1000);
    }
}

Answer 1

如果两个类都需要能够获取和设置 providerData_，我会创建第三个 Data 类来拥有 providerData_。然后我可以将 Data 类的指针指向所有需要访问该数据的类。