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new operator的作用：首先会在堆上开辟一段空间(调用的是operator new函数，其实底层实际调用的是malloc)， 然后调用new operator后面的typename的构造函数(如果是普通类型则不需要)， 最后new operator typename会返回一个指向该堆的内存地址． 如果想要在栈上调用new operator：我们需要做的就是不让new operator
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