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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/integral_constant.hpp>
- #include <cstddef>
- #include <type_traits>
- namespace hana = boost::hana;
- // operator()
- static_assert(hana::size_c<0>() == 0, "");
- static_assert(hana::size_c<1>() == 1, "");
- static_assert(hana::int_c<-3>() == -3, "");
- // decltype(operator())
- static_assert(std::is_same<decltype(hana::size_c<0>()), std::size_t>{}, "");
- static_assert(std::is_same<decltype(hana::int_c<-3>()), int>{}, "");
- // conversions
- constexpr std::size_t a = hana::size_c<0>, b = hana::size_c<1>;
- static_assert(a == 0 && b == 1, "");
- constexpr int c = hana::int_c<0>, d = hana::int_c<-3>;
- static_assert(c == 0 && d == -3, "");
- // nested ::value
- static_assert(decltype(hana::int_c<1>)::value == 1, "");
- // nested ::type
- static_assert(std::is_same<
- decltype(hana::int_c<1>)::type,
- std::remove_cv_t<decltype(hana::int_c<1>)>
- >{}, "");
- // nested ::value_type
- static_assert(std::is_same<decltype(hana::int_c<1>)::value_type, int>{}, "");
- // inherits from std::integral_constant
- static_assert(std::is_base_of<std::integral_constant<int, 3>,
- hana::integral_constant<int, 3>>{}, "");
- int main() { }
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