const CFoo&bar()const

Question

例如,我有一个类的属性,const CFoo &bar() const它是什么意思？

Answer 1

该方法bar返回对const的引用CFoo(即const CFoo &之前的部分bar),并且调用此方法不会修改任何未标记为的变量mutable(即const括号后面的变量).

另请参阅C++ FAQ Lite条目" Fred const& X"是什么意思？而什么是" const成员函数"？.

Answer 2

const CFoo& bar() const
----------      --------
      ^               ^
Returns a connst      None of the member variables of the class to which bar
reference of CFoo.    method belongs to can be modified.
                      unless member variable is prefexex with keyword mutable