In the constructor function, a new trace file is opened into which the profiling address trace will be written; within the destructor function, the trace file is closed (see Listing 3).

在constructor函数中，会打开一个新的跟踪文件，分析数据的地址跟踪就是写入这个文件的；在destructor函数中，会关闭这个跟踪文件(参见清单3)。

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