August 2021
Intermediate to advanced
450 pages
5h 35m
Chinese
Content preview from C++语言导学（原书第2版）
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3.6.3 结构化绑定
一个函数只能返回一个值，但这个值可以是一个包含很多成员的类对象。这令我们可以高效地返回很多值。例如：
在本例中，我们用{s，i}构造Entry类型返回值。类似地，可以将一个Entry的成员“解包”到局部变量中：
auto[n，v]声明了两个局部变量n和v，它们的类型是从read_entry（）的返回值推断出来的。这种为类对象的成员赋予局部名字的机制称为结构化绑定（structured binding）。
考虑另一个例子：
照例，我们用const和&装点auto。例如：
当我们将结构化绑定用于没有私有数据的类时，很容易看到绑定是如何进行的：定义的用于绑定的名字数目必须与类的非静态数据数目一致，且绑定时引入的每个名字为对应的成员命名。与显式使用组合对象的版本相比，代码质量没有什么差别，结构化绑定的使用只关乎如何更好地表达一个思想。 ...
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