August 2021
Intermediate to advanced
450 pages
6h 57m
Chinese
Content preview from C++程序设计语言（第4部分：标准库）（原书第4版）
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38.3 错误处理
一个iostream在某个时刻会处于四种状态之一，这些状态的定义来自于<ios>的basic_ios中（见38.4.4节）：
如果一个流不在good（）状态，对它的任何操作都没有效果，即相当于空操作。一个iostream可以作为一个条件来使用：若iostream的状态为good（），则条件为真（成功）。人们编写从流中读取数据的代码时，习惯于以此为基础：
若读取失败，我们或许可以清除流状态，继续读取：
我们也可以使用异常来处理错误：
例如，我们可以令cin在其状态被设置为bad（）时（例如，通过cin.setstate（ios_base：：badbit））抛出一个basic_ios：：failure：
例如：
我倾向于使用异常来处理那些我不奢望能恢复的iostream错误。这通常意味着捕获的都是一些bad（）异常。 ...
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