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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/assert.hpp>
- #include <boost/hana/concept/metafunction.hpp>
- #include <boost/hana/equal.hpp>
- #include <boost/hana/not.hpp>
- #include <boost/hana/type.hpp>
- #include <type_traits>
- namespace hana = boost::hana;
- struct x1; struct x2; struct x3;
- struct y1 { }; struct y2 { }; struct y3 { };
- template <typename ...> struct f;
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::template_<f>(),
- hana::type_c<f<>>
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::template_<f>(hana::type_c<x1>),
- hana::type_c<f<x1>>
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::template_<f>(hana::type_c<x1>, hana::type_c<x2>),
- hana::type_c<f<x1, x2>>
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::template_<f>(hana::type_c<x1>, hana::type_c<x2>, hana::type_c<x3>),
- hana::type_c<f<x1, x2, x3>>
- ));
- using F = decltype(hana::template_<f>);
- static_assert(std::is_same<F::apply<>::type, f<>>{}, "");
- static_assert(std::is_same<F::apply<x1>::type, f<x1>>{}, "");
- static_assert(std::is_same<F::apply<x1, x2>::type, f<x1, x2>>{}, "");
- static_assert(std::is_same<F::apply<x1, x2, x3>::type, f<x1, x2, x3>>{}, "");
- // Make sure we model the Metafunction concept
- static_assert(hana::Metafunction<decltype(hana::template_<f>)>::value, "");
- static_assert(hana::Metafunction<decltype(hana::template_<f>)&>::value, "");
- // Make sure we can use aliases
- template <typename T> using alias = T;
- static_assert(hana::template_<alias>(hana::type_c<x1>) == hana::type_c<x1>, "");
- // Make sure template_ is SFINAE-friendly
- template <typename T> struct unary;
- BOOST_HANA_CONSTANT_CHECK(hana::not_(
- hana::is_valid(hana::template_<unary>)(hana::type_c<void>, hana::type_c<void>)
- ));
- // Make sure we don't read from a non-constexpr variable
- int main() {
- auto t = hana::type_c<x1>;
- constexpr auto r = hana::template_<f>(t);
- (void)r;
- }
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