1 // { dg-do compile { target c++11 } }
2 
3 #include <initializer_list>
4 
5 extern "C" int printf (const char *, ...);
6 
7 using size_t = decltype(sizeof(0));
8 
9 template <typename T> class ArrayRef {
10 public:
11   using size_type = size_t;
12 
13 private:
14   /// The start of the array, in an external buffer.
15   const T *Data = nullptr;
16 
17   /// The number of elements.
18   size_type Length = 0;
19 
20 public:
21   /// Construct an ArrayRef from a std::initializer_list.
ArrayRef(const std::initializer_list<T> & Vec)22   /*implicit*/ ArrayRef(const std::initializer_list<T> &Vec)
23       : Data(Vec.begin() == Vec.end() ? (T *)nullptr : Vec.begin()), // { dg-warning initializer_list }
24         Length(Vec.size()) {}
25 
26   const T &operator[](size_t Index) const { return Data[Index]; }
27 };
28 
main()29 int main() {
30   const ArrayRef<int> Foo = {42};
31   printf ("Foo %d\n", Foo[0]);
32 }
33