当定义类的数据成员时,我们可以为其提供一个默认初始值,称为默认成员初始值(default member initializer)。考虑complex(参见4.2.1节)的一个修改版本:
如果构造函数未提供值,就会使用默认值。这种机制简化了代码,而且帮助我们避免意外地漏掉成员初始化。
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