That is, there isn't actually any type called InputIterator: when you call find, the compiler substitutes the actual type of the arguments for the formal type parameters InputIterator and t.
也就是说，没有实际的类型InputIterator：当你调用find时，编译器会把他们替换成正式的类型。
The formal parameters of the C# indexer become the parameters of the corresponding UML operation and the type of the indexer becomes the return type of the UML operation.
C# 索引器的形式参数成为相应的 UML 操作的参数，而索引器的类型成为 UML 操作的返回类型。
It does not include the indexer type or the names of the formal parameters.
这并不包括索引子型别和该型式参数的名称。
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