普通指针就像一把钥匙： Foo* p = new Foo(); // 拿钥匙，开了一间房 // ... 用着用着忘了归还 // 程序结束，房间还占着 → 内存泄漏 或者： Foo* p = new Foo(); delete p; // 退房 delete p; // 又退一次 → 程序崩溃（double free） 或者中途出异常： Foo* p = new Foo(); doSomething ...

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