The main method then proceeds to delegate the parsing of the argument to a CmdLineParser object, which then returns an Options object.

main方法然后会将参数解析委托给CmdLineParser对象，后者将返回Options对象。

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Let's now turn our attention to the main method. It creates an event-handler object and a parser object.

现在，让我们将注意力转向main方法。

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Type into the member function Main a few lines of code to create an instance of Quad and then assert that when the object Area method is given a length of 3 and width of 2, it returns the value 6.

在主函数中输入下列几行代码，创建Quad实例，并通过Assert断言，当长宽各为3和2时，返回的结果应该是6。

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