How can I create an array of void pointers through variadic templates?-CodePudding

I have something like:

class A
{
public:
   A(B* b, int* i)
   {
    void* args[] = { (void*)&b, (void*)&i };
   }
};

But I need it to be more generic, in the sense that I want to the constructor of A to accept any number of variables, of any type.

How do I accomplish this with templates?

CodePudding user response：

You can write your constructor this way:

class A {
public:
    template <class... Args>
    A(Args*... pargs) {
        void* args[] = { (void*)&pargs... };
    }
};

Note that you are storing the address of the pointers, not the pointers themselves, in args.

Also I wouldn't use that kind of things unless you have a very good reason to in actual code.

CodePudding user response：

First of all: Dont't do it! For me it looks like a design bug if you need to convert all and everything to void pointers. But ok, the code can be:

class A
{
    public:
        template < typename ... T>
            A(T*... parms)
            {
                void* args[] = { (void*)&parms... };
            }
};

But why we need pointer to pointer withoud having the types anymore... I have no idea!