constructor initializer

基本解释

Some members must be initialized in the constructor initializer.
有些成员必须在构造函数初始化列表中进行初始化。
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A constructor initializer list specifies initial values for one or more data members of the class.
构造函数的初始化列表为类的一个或多个数据成员指定初值。
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The constructor initializer is a list of member names, each of which is followed by that member's initial value in parentheses.
构造函数的初始化式是一系列成员名，每个成员后面是括在圆括号中的初始值。
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