Parameter pack passed by reference

Question

I wrote a simple variadic template function and I'm trying to understand why it doesn't work. (Its output counterpart works perfectly.)

#include <iostream>

void read() {}

template<class curr_t, class... rest_t>
void read(curr_t &var, rest_t... rest)
{
    std::cin >> var;
    read(rest...);
}

int main()
{   
    int a = 0, b = 0, c = 0;

    read(a, b, c); //input: 1 2 3
    std::cout << a << b << c; //output: 1 0 0

    std::cin.ignore();
    std::cin.get();
}       

As can be seen from the comments, I input 1 2 3 for a b c and the output I get is 1 0 0. As it is apparent, only a saves its value. Can someone explain why this happens and what can I do to fix it? Thanks!

EDIT:: Yes, apparently I had the concept of parameter packs wrong! I was also trying to do the following: rest_t... &rest which gives me a compiler error.

Instead if I write rest_t&... rest it works as intended. I suppose it was just a syntax error on my side! Thanks to whoever posted this as an answer and deleted his answer a minute later! D:

Answer 1

a is passed by reference but the others are copied: when you call it recursively, they are, yes, taken by reference, but they refer to a variable previously passed by value so it won't be modified externally.

template<class curr_t, class... rest_t>
void read(curr_t &var, rest_t&... rest)
//                           ^               
{
    std::cin >> var;
    read(rest...);
}