| 1 | // Copyright Louis Dionne 2013-2022 |
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| 2 | // Distributed under the Boost Software License, Version 1.0. |
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| 3 | // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) |
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| 4 | |
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| 5 | #include <boost/hana/integral_constant.hpp> |
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| 6 | |
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| 7 | #include <cstddef> |
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| 8 | #include <type_traits> |
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| 9 | namespace hana = boost::hana; |
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| 10 | |
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| 11 | |
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| 12 | // operator() |
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| 13 | static_assert(hana::size_c<0>() == 0, "" ); |
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| 14 | static_assert(hana::size_c<1>() == 1, "" ); |
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| 15 | static_assert(hana::int_c<-3>() == -3, "" ); |
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| 16 | |
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| 17 | // decltype(operator()) |
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| 18 | static_assert(std::is_same<decltype(hana::size_c<0>()), std::size_t>{}, "" ); |
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| 19 | static_assert(std::is_same<decltype(hana::int_c<-3>()), int>{}, "" ); |
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| 20 | |
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| 21 | // conversions |
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| 22 | constexpr std::size_t a = hana::size_c<0>, b = hana::size_c<1>; |
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| 23 | static_assert(a == 0 && b == 1, "" ); |
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| 24 | |
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| 25 | constexpr int c = hana::int_c<0>, d = hana::int_c<-3>; |
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| 26 | static_assert(c == 0 && d == -3, "" ); |
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| 27 | |
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| 28 | // nested ::value |
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| 29 | static_assert(decltype(hana::int_c<1>)::value == 1, "" ); |
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| 30 | |
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| 31 | // nested ::type |
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| 32 | static_assert(std::is_same< |
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| 33 | decltype(hana::int_c<1>)::type, |
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| 34 | std::remove_cv_t<decltype(hana::int_c<1>)> |
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| 35 | >{}, "" ); |
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| 36 | |
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| 37 | // nested ::value_type |
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| 38 | static_assert(std::is_same<decltype(hana::int_c<1>)::value_type, int>{}, "" ); |
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| 39 | |
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| 40 | // inherits from std::integral_constant |
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| 41 | static_assert(std::is_base_of<std::integral_constant<int, 3>, |
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| 42 | hana::integral_constant<int, 3>>{}, "" ); |
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| 43 | |
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| 44 | int main() { } |
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| 45 | |
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