Why initializer_list is not working

Question

Hi
I tried to implement queue using two stacks and it works fine as below:
https://code.sololearn.com/cg5Iz87Ve3AC
My query is related to initializer list. Why below code fails even though a constructor with initializer list is provided for myQueue class?
//myQueue q1 {1, 2, 3};

Answer 1

Pass the std::initializer_list by value or const ref, though pass by value is preferred for an initializer_list since it's very cheap.