Inserting a variadic argument list into a vector?

Question

Forgive me if this has been answered already, as I couldn\'t find it...

Basically I have an object that needs to take a variadic argument list in it\'s constructor

Answer 1

The best thing would be to use an initializer list

#include 
#include 
class GenericNode {
public:
    GenericNode(std::initializer_list inputs) 
        :inputs_(inputs) {} //well that's easy
private:
    std::vector inputs_;
};
int main() {
    GenericNode* ptr;
    GenericNode node{ptr, ptr, ptr, ptr};
} //compilation at http://stacked-crooked.com/view?id=88ebac6a4490915fc4bc608765ba2b6c

The closest to what you already have, using C++11 is to use the vector's initializer_list:

    template
    GenericNode(Ts... inputs) 
        :inputs_{inputs...} {} //well that's easy too
    //compilation at http://stacked-crooked.com/view?id=2f7514b33401c51d33677bbff358f8ae

And here's a C++11 version with no initializer_lists at all. It's ugly, and complicated, and requires features missing from many compilers. Use the initializer list

template
using Alias = T;

class GenericNode {
public:
    template
    GenericNode(Ts... inputs) { //SFINAE might be appropriate
         using ptr = GenericNode*;
         Alias{( //first part of magic unpacker
             inputs_.push_back(ptr(inputs))
             ,'0')...,'0'}; //second part of magic unpacker
    }
private:
    std::vector inputs_;
};
int main() {
    GenericNode* ptr;
    GenericNode node(ptr, ptr, ptr, ptr);
} //compilation at http://stacked-crooked.com/view?id=57c533692166fb222adf5f837891e1f9
//thanks to R. Martinho Fernandes for helping me get it to compile

Unrelated to everything, I don't know if those are owning pointers or not. If they are, use std::unique_ptr instead.