45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
// Copyright Louis Dionne 2013-2017
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <boost/hana/integral_constant.hpp>
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#include <cstddef>
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#include <type_traits>
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namespace hana = boost::hana;
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// operator()
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static_assert(hana::size_c<0>() == 0, "");
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static_assert(hana::size_c<1>() == 1, "");
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static_assert(hana::int_c<-3>() == -3, "");
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// decltype(operator())
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static_assert(std::is_same<decltype(hana::size_c<0>()), std::size_t>{}, "");
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static_assert(std::is_same<decltype(hana::int_c<-3>()), int>{}, "");
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// conversions
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constexpr std::size_t a = hana::size_c<0>, b = hana::size_c<1>;
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static_assert(a == 0 && b == 1, "");
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constexpr int c = hana::int_c<0>, d = hana::int_c<-3>;
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static_assert(c == 0 && d == -3, "");
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// nested ::value
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static_assert(decltype(hana::int_c<1>)::value == 1, "");
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// nested ::type
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static_assert(std::is_same<
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decltype(hana::int_c<1>)::type,
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std::remove_cv_t<decltype(hana::int_c<1>)>
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>{}, "");
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// nested ::value_type
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static_assert(std::is_same<decltype(hana::int_c<1>)::value_type, int>{}, "");
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// inherits from std::integral_constant
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static_assert(std::is_base_of<std::integral_constant<int, 3>,
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hana::integral_constant<int, 3>>{}, "");
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int main() { }
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