August 2021
Intermediate to advanced
450 pages
9h 36m
Chinese
Content preview from C++程序设计：原理与实践（基础篇）（原书第2版）
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10.11.2 读取结构化的值
可以使用Reading类来读取输入，而且更为简单：
基本上，我们还是先检查格式是否合法，如果不合法，我们将文件状态置为fail（），并返回。这允许我们尝试通过其他方式读取信息。另一方面，如果在读取了一些数据后才发现格式错误，就没有了错误恢复的机会，我们只能通过error（）退出。
Month的输入操作实现大体相同，只有一点不同：必须读入任意数目的Reading对象，而不是像Reading的>>那样只需读取一组固定个数的值：
month_to_int（）将月份的符号表示（如jun）转换为一个0到11之间的整型值，这在后面会继续讨论。需要注意的是，代码中使用了10.10节中给出的end_of_loop（）来检测终结符。我们对不合法的和重复的Readings进行计数，计数结果可能对其他人是有用的。 ...
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