The compiler provides a built-in function, which is evaluated at compile time, to determine the length of an array (e.g. len (a)).

编译器提供了内建的功能在编译时求得一个数组的长度(如len (a))。

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The compiler doesn't know what type V really represents, so it cannot instantiate an array of V.

编译器不知道V到底表示什么类型，因此不能实例化V数组。

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Listing 2. Faking out the compiler with a final reference to a one-element array.

清单2 .使用对一元素数组的最终引用欺骗编译器。

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