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我创建了以下类

#include <iostream>
#include <boost/thread.hpp>
#include <boost/date_time.hpp>

class Messaging
{
public:
    Messaging(const std::string& newMessage, unsigned long long maxTimeToDeliver = 12): m_theMessage(newMessage), m_maxTimeToDeliver(maxTimeToDeliver), athread(){};
    virtual ~Messaging(void);

protected:
    std::string m_theMessage;
    unsigned long long m_maxTimeToDeliver;
    boost::thread athread;
};

和子类

#include "messaging.h"
#include <iostream>

class SportMessaging :public Messaging
{
public:
    SportMessaging(const std::string newMessage, unsigned long long maxTimeToDeliver = 1): Messaging(newMessage, maxTimeToDeliver) {};
    virtual ~SportMessaging(void);
};

主要是我尝试为每个对象创建一个对象

#include "SportMessaging.h"
#include <boost/thread.hpp>
#include <boost/date_time.hpp>
int main()
{
    SportMessaging anotherSportMessagingObject = SportMessaging("another sports message",4);  //gives error C2248: 'boost::thread::thread' : cannot access private member declared in class 'boost::thread'

    Messaging aMessObj = Messaging("sports message 3");  //works

    return 0;
}

为什么我可以创建 Messaging 对象，但 SportMessaging 对象失败？

我环顾四周，怀疑它可能与具有类似 boost::thread_group 的私有复制构造函数的 boost::thread 相关（关于在类中使用 boost::thread_group 的 stackoverflow 帖子）。

然而，似乎两者Messaging("sports message 3")都会SportMessaging("another sports message",4)调用它们的复制构造函数，然后调用每个非静态成员的复制构造函数（即包括尝试调用 boost::thread 的复制构造函数）。最后一句中的想法与 'SportMessaging anotherSportMessagingObject = SportMessaging("another sports message",4);' 不起作用，'Messaging aMessObj = Messaging("sports message 3");` 有效。

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