课堂上不同的“this”

我在课堂上玩耍,偶然发现了这种好奇心

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

class pint {
public:
    pint() { std::cout << "ctor >> " << this << std::endl; };
    ~pint() { std::cout << "dtor >> " << this << std::endl; };
    pint(int x) { std::cout << "set 1. >> " << this << std::endl; };
    pint& operator = (const pint& a) { std::cout << "set 2. >> " << this << " | a >> " << &a << std::endl; return *this; };
};

int main()
{
    pint * x1 = new pint;
    *x1 = 8;
    *x1 = 9;

    std::cout << "---------------------" << std::endl;

    pint * x2 = new pint;
    *x2 = 8;
    *x2 = 9;

    std::cout << "---------------------" << std::endl;

    delete x1;
    delete x2;

    while (!GetAsyncKeyState(VK_RETURN))
        Sleep(1);

    return 0;
}

输出:

ctor >> 008731E8
set 1. >> 005BF9A7
set 2. >> 008731E8 | a >> 005BF9A7
dtor >> 005BF9A7
set 1. >> 005BF9A7
set 2. >> 008731E8 | a >> 005BF9A7
dtor >> 005BF9A7
---------------------
ctor >> 00873288
set 1. >> 005BF9A7
set 2. >> 00873288 | a >> 005BF9A7
dtor >> 005BF9A7
set 1. >> 005BF9A6
set 2. >> 00873288 | a >> 005BF9A6
dtor >> 005BF9A6
---------------------
dtor >> 008731E8
dtor >> 00873288

原因:

• “这个”在全班都不一样吗?
• 输出的第一部分是“设置1”输出的第二部分和第二部分是“设置1”不同的
• “设置1。”与ctor不同?(如果是因为制作新对象或类似的东西,为什么要制作?)
• “a”等于“集合1”“ctor”/“dtor”(在末尾)等于“set 2”?
• “设置1。”呼叫dtor?