To cache the records from the alternate source, you need a cache per value type returned.

要缓存这些来自备用源的记录，您需要为返回的每种值类型设置一个缓存。

youdao

Whether a data type is a value type or a reference type, the communicating parties could also pose problems.

无论数据类型是数值类型还是引用类型，信息传递的一方都可能出现问题。

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That means a reference type can have a null pointer, but a value type cannot have a null value.

这意味着引用类型可能有空指针，但是数值类型不能有空值。

youdao

So it does that for us so that you can get away with just knowing the address of the first byte and it will make sure that you know when to stop by including the special value so, in fact, get the string if you type in a three-letter word, we allocate four bytes no matter what because we need an additional byte 0 for this special sentinel value back slash zero at the very end.

它为我们做了这些事情，这样我们就可以,通过第一个字节的地址,它还可以通过包含一个特殊的值,来保证在哪里停止，如果你输入了一个三个字母的单词,就可以获得那个字符串，不管怎样，我们分配四个字节,因为我们在末端需要一个额外的字节,来保存这个特殊的标志值--反斜杠。

哈佛公开课 - 计算机科学课程节选

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