C 0x 생성자에서 멤버 배열을 초기화하는 방법: `std::initializer_list` 사용이 실패하는 이유와 해결 방법은 무엇입니까?

<code class="cpp">struct Foo
{
    int const data[2];

    Foo(std::initializer_list<int const>& ini)
    : data(ini)
    {}
};

Foo f = {1,3};</code>

incompatible types in assignment of ‘std::initializer_list<const int>&’ to ‘const int [2]’

<code class="cpp">struct foo {
    int x[2];
    template <typename... T>
    foo(T... ts) : x{ts...} {} // curly braces syntax for initializer list
};

int main() {
    foo f1(1, 2);   // compiles successfully
    foo f2{1, 2};   // also compiles
    foo f3(42);    // x[1] is zero-initialized
}</code>

<code class="cpp">struct foo {
    int x[2]; 
    foo(std::initializer_list<int> il) {
       std::copy(il.begin(), il.end(), x);
    }
};</code>