通过指针传递参数(passing by pointer)，函数定义如下: day *operator++(day *d); 它通过将增加后的值存储到*d 里面来使函数改变日期(day)的值。
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您不能通过声明为Order的指针来访问它，您也不能将它传递到另外一个希望以Order作为参数的方法。
You can't access it through a pointer declared as an Order, nor can you pass it to another method expecting an Order as an argument.
几乎每一个API程序能够访问一个池，通过一个指针指向一个明确的参数列表或有一个内部传递的结构。
Almost every single API routine has access to a pool, either through a pointer to one being explicitly in the argument list or by there being one inside one of the structures that is passed.
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