想实现一下单例模式，但我发现h_wife为空的情况下是可以调用wife类的marry方法，很奇怪，为啥不报错啊...


#include <iostream>
using namespace std;

class Wife
{
public:
    void marry()
    {
        cout << "this:" << this << endl;
        cout << "姑娘结婚..." << endl;
    }

    static Wife* creatWife()
    {
        if (m_Wife==nullptr)
        {
            m_Wife = new Wife();
        }
        return m_Wife;
    }
private:
    Wife(){  };//私有构造函数
    static Wife* m_Wife;
};

Wife* Wife::m_Wife = nullptr;

class husband
{
public:
    husband()
    {
        h_wife = nullptr;
    }
    //选媳妇方法
    void choose()
    {
        h_wife = Wife::creatWife();
    }

    //结婚方法
    void getMarry()
    {
        //m_wife = Wife::creatWife();
        h_wife->marry();
    }
private:
    Wife* h_wife;
};

int main()
{
    husband m_husband;
    m_husband.getMarry();//这里为啥不报错
    while (1);
    return 0;
}