gcc/testsuite/g++.dg/cpp0x/variadic-sizeof4a.C

   1 // PR c++/69958
   2 // { dg-do compile { target c++11 } }
   3
   4 typedef decltype(sizeof(int)) size_t;
   5
   6 template <typename...Ts>
   7 struct list { };
   8
   9 template <size_t N>
  10 struct size {  };
  11
  12 template <unsigned...Ts>
  13 using size_for = size<sizeof...(Ts)>;
  14
  15 template<class T, class U> struct assert_same;
  16 template<class T> struct assert_same<T,T> {};
  17
  18 template <typename T, unsigned...Ts>
  19 using wrapped = list<T, size_for<0, Ts...>>;
  20
  21 // This assertion fails (produces size<4>)
  22 assert_same<
  23     list<float, size<5>>,
  24   wrapped<float,2,3,4,5>> a3;
  25
  26
  27 template <typename T, unsigned...Ts>
  28 using wrapped2 = list<T, size_for<Ts..., 0>>;
  29
  30 // This assertion fails (produces size<2>)
  31 assert_same<
  32     list<float, size<5>>,
  33   wrapped2<float,2,3,4,5>> a4;