如何在指向const地址时声明成员函数const指针 [英] How to declare a member function const pointer while point to const address

问题描述

我的意思是类似const char* const p;或char const * const p;的东西.此处的p表示指针指向const char，而指针本身也是const. 因此，不会遵守*p = 'a';或char c = 'c'; p = &c;.

What I mean is something like const char* const p; or char const * const p;. The p here stand for a pointer points to a const char while the pointer itself is also const. So *p = 'a'; or char c = 'c'; p = &c; won't be complied.

请有人告诉我如何声明一个指向成员函数的指针，该成员函数指向的对象本身就是const，带有和不带有typedef.

Please someone tell me how to declare a pointer points to a member function, both what it points to and itself is const, with and without typedef.

不要只是出于好奇而在实践中使用.

Not use in practice just curious about.

这不是什么我在问.

推荐答案

不能取消引用成员函数指针来修改指针，因此只需要一个const:

Member function pointers can't be dereferenced to modify the pointee, so only one const is needed:

RetType (Class::* const ptr)(Arg1Type, ..., ArgNType) = ...;

使用typedefs:

With typedefs:

typedef RetType (Class::* PtrTypedefName)(Arg1Type, ..., ArgNType);
const PtrTypedefName ptr = ...;

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