tuple在构造时，会通过拷贝构造或移动构造对对象进行复制或移动：

#include <iostream>
#include <tuple>
using namespace std;class A{
public:A(int i): m_i(i){cout<<"construct A, "<<"m_i="<<m_i<<", addr of this:"<<this<<", addr of this m_i:"<<&m_i<<endl;}A(const A& a){this->m_i = a.m_i;cout<<"copy construct A, "<<"m_i="<<m_i<<", addr of this:"<<this<<", addr of this m_i:"<<&m_i<<", ori addr:"<<&a<<endl;}A(A&& a){this->m_i = a.m_i;cout<<"move construct A, "<<"m_i="<<m_i<<", addr of this:"<<this<<", addr of this m_i:"<<&m_i<<", ori addr:"<<&a<<endl;}int m_i;
};void f1(const tuple<