ceph/src/boost/libs/hana/test/core/when.cpp

   1 // Copyright Louis Dionne 2013-2017
   2 // Distributed under the Boost Software License, Version 1.0.
   3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   4
   5 #include <boost/hana/core/when.hpp>
   6 namespace hana = boost::hana;
   7
   8
   9 template <typename T, typename = hana::when<true>>
  10 struct base_template;
  11
  12 template <typename T>
  13 struct base_template<T, hana::when_valid<typename T::first_type>> { };
  14
  15 template <typename T>
  16 struct base_template<T, hana::when_valid<typename T::second_type>> { };
  17
  18 struct First { struct first_type; };
  19 struct Second { struct second_type; };
  20
  21 template struct base_template<First>;
  22 template struct base_template<Second>;
  23
  24 int main() { }