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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/bool.hpp>
- #include <boost/hana/fwd/hash.hpp>
- #include <boost/hana/set.hpp>
- #include <boost/hana/type.hpp>
- #include <type_traits>
- namespace hana = boost::hana;
- template <int i>
- struct NoDefault {
- NoDefault() = delete;
- NoDefault(NoDefault const&) = default;
- constexpr explicit NoDefault(int) { }
- };
- template <int i, int j>
- auto operator==(NoDefault<i> const&, NoDefault<j> const&) { return hana::bool_<i == j>{}; }
- template <int i, int j>
- auto operator!=(NoDefault<i> const&, NoDefault<j> const&) { return hana::bool_<i != j>{}; }
- template <int i>
- struct Default {
- Default() = default;
- Default(Default const&) = default;
- constexpr explicit Default(int) { }
- };
- template <int i, int j>
- auto operator==(Default<i> const&, Default<j> const&) { return hana::bool_<i == j>{}; }
- template <int i, int j>
- auto operator!=(Default<i> const&, Default<j> const&) { return hana::bool_<i != j>{}; }
- namespace boost { namespace hana {
- template <int i>
- struct hash_impl<NoDefault<i>> {
- static constexpr auto apply(NoDefault<i> const&)
- { return hana::type_c<NoDefault<i>>; };
- };
- template <int i>
- struct hash_impl<Default<i>> {
- static constexpr auto apply(Default<i> const&)
- { return hana::type_c<Default<i>>; };
- };
- }}
- int main() {
- {
- auto set0 = hana::make_set();
- static_assert(std::is_default_constructible<decltype(set0)>{}, "");
- auto set1 = hana::make_set(Default<0>(int{}));
- static_assert(std::is_default_constructible<decltype(set1)>{}, "");
- auto set2 = hana::make_set(Default<0>(int{}), Default<1>(int{}));
- static_assert(std::is_default_constructible<decltype(set2)>{}, "");
- auto set3 = hana::make_set(Default<0>(int{}), NoDefault<1>(int{}), Default<2>(int{}));
- static_assert(!std::is_default_constructible<decltype(set3)>{}, "");
- }
- {
- auto set1 = hana::make_set(NoDefault<0>(int{}));
- static_assert(!std::is_default_constructible<decltype(set1)>{}, "");
- auto set2 = hana::make_set(NoDefault<0>(int{}), NoDefault<1>(int{}));
- static_assert(!std::is_default_constructible<decltype(set2)>{}, "");
- auto set3 = hana::make_set(NoDefault<0>(int{}), NoDefault<1>(int{}), NoDefault<2>(int{}));
- static_assert(!std::is_default_constructible<decltype(set3)>{}, "");
- }
- }
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