gcc/testsuite/g++.dg/cpp2a/nontype-class7.C

   1 // Example from P0732.
   2 // { dg-do compile { target c++2a } }
   3
   4 namespace std {
   5   using size_t = decltype(sizeof(1));
   6   template <typename CharT, std::size_t N>
   7   struct basic_fixed_string
   8   {
   9     constexpr basic_fixed_string(const CharT (&foo)[N+1])
  10     : m_data()
  11     {
  12       for (int i = 0; i <= N; ++i)
  13         m_data[i] = foo[i];
  14     }
  15     // auto operator<=>(const basic_fixed_string &) = default;
  16     CharT m_data[N+1];
  17   };
  18   template <typename CharT, std::size_t N>
  19   basic_fixed_string(const CharT (&str)[N])->basic_fixed_string<CharT, N-1>;
  20   template <std::size_t N>
  21   using fixed_string = basic_fixed_string<char, N>;
  22 }
  23
  24 template <std::basic_fixed_string Str>
  25 struct A {};
  26 using hello_A = A<"hello">;