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- // Copyright Louis Dionne 2013-2017
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- #include <boost/hana/core/when.hpp>
- namespace hana = boost::hana;
- template <typename T, typename = hana::when<true>>
- struct base_template;
- template <typename T>
- struct base_template<T, hana::when_valid<typename T::first_type>> { };
- template <typename T>
- struct base_template<T, hana::when_valid<typename T::second_type>> { };
- struct First { struct first_type; };
- struct Second { struct second_type; };
- template struct base_template<First>;
- template struct base_template<Second>;
- int main() { }
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