C++ best way to intialize a vector with array of elements

I am trying to initialize a vector member variable with an array of integers:

#include <vector>
#include <iostream>

struct A
{
A(int arr[]) : mvec(arr)
{

}
std::vector<int> mvec;
};

int main()
{
    A s({1,2,3});
}

Compilation gives me error :

$ c++ -std=c++11 try59.cpp

try59.cpp:15:12: note: candidates are:
try59.cpp:6:1: note: A::A(int*)
 A(int arr[]) : mvec(arr)

How can I initialize my vector using an array of integers?