If it is 1, proceed to the actual callee.

如果返回值是1，继续实际的调用。

A method is a contract between a caller and a callee.

协调调用者和被调用者行为的方法之一是约定。

The caller and callee must agree on the size of the buffer.

调用方和被调用方必须就缓冲区的大小达成一致。

This number includes objects that were created in callee functions.

此数目包括在调用方函数中创建的对象。

Someone may change the callee in the future to return a failure condition.

某些人将来可能改变被调用的函数，导致返回一个失败的条件。