C++ 允许函数指针 and 函数参考 https://stackoverflow.com/questions/480248/function-references。它还允许指向成员函数的指针.
But 是否允许引用成员函数?
我似乎无法从标准中推断出规则，而且我也未能使程序与它们一起工作。
[ member function pointers http://www.ideone.com/C6oex ] [ member function references http://www.ideone.com/D9tUI ]
[C++11: 8.3.3/3]: A pointer to member shall not point to a static
member of a class (9.4), a member with reference type, or “cv void.” [
Note: See also 5.3 and 5.5. The type “pointer to member” is distinct
from the type “pointer”, that is, a pointer to member is declared only
by the pointer to member declarator syntax, and never by the pointer
declarator syntax. There is no “reference-to-member” type in C++. —end
note ]
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