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What does the single ampersand mean here?3
我曾经在那里看到:
Is returning by rvalue reference more efficient?
我曾经在那里看到:
Is returning by rvalue reference more efficient?
成员函数定义:
Beta_ab const& getAB() const& { return ab; }
我熟悉成员函数的cv-qualifier(const),但不熟悉const&
最后一个const和意思?