如下代码的输出，在vs2017和网上编译器都是一样的，留存看看以后能不能解惑

#include <iostream>
#include <memory>
#include <string>
using namespace std;
int g_constructNum = 0;
int g_copyConstructNum = 0;
int g_moveConstructNum = 0;
int g_deleteNum = 0;

class MyTestString
{
private:
    std::string m_data;
    int m_value;
    void test() {}
public:
    MyTestString(std::string data,int value) :m_data(data),m_value(value)
    {
        std::cout << "construct: " << ++g_constructNum << std::endl;
    }
    MyTestString(const MyTestString& myTestString)
    {
        m_data = myTestString.m_data;
        m_value = myTestString.m_value;
        std::cout << "copy construct: " << ++g_copyConstructNum << std::endl;
    }
    MyTestString(MyTestString &&myTestString)
    {
        std::swap(m_data, myTestString.m_data);
        std::swap(m_value, myTestString.m_value);
        std::cout << "move copy construct: " << ++g_moveConstructNum << std::endl;
    }
    ~MyTestString()
    {
        std::cout << "destruct: " << ++g_deleteNum << std::endl;
    }
};

MyTestString getTempString()
{
    MyTestString temp("tangmiao", 1);
    return temp;
}

int main()
{
    //MyTestString temp = getTempString();
    MyTestString temp(MyTestString("tangmiao",1));
    return 0;
}

按道理应该是输出：
construct: 1
move copy construct: 1
destruct: 1
destruct: 2

而输出的是：
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