You declare a class constant with the const keyword.
用const关键字声明类常量。
Embedding const ants in code is obviously foolish.
在代码中嵌入常量显然是愚蠢的。
If you don't need to change it, use const reference.
如果你不需要改变它，使用常量引用。
See Compile time trap when saving a non-const value for details.
细节请见保存一个非常量值时的编译期陷阱。
Will temporary object be deleted if there is no const reference to it?
将临时对象，如果没有引用它删除？
Will temporary object be deleted if there is no const reference to it?
将临时对象，如果没有引用它删除？
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