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56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
/*
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@copyright Louis Dionne 2014
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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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*/
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#include <boost/hana/detail/assert.hpp>
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#include <boost/hana/integral.hpp>
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#include <type_traits>
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using namespace boost::hana;
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//! [integral_create]
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auto two = integral<int, 2>;
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auto yes = integral<bool, true>;
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//! [integral_create]
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//! [integral_api]
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using Two = decltype(two);
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static_assert(std::is_same<Two::type, Two>{}, "");
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static_assert(std::is_same<Two::value_type, int>{}, "");
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static_assert(Two::value == 2 &&
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static_cast<int>(two) == 2 &&
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two() == 2 &&
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value(two) == 2
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, "these are all constant expressions");
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//! [integral_api]
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namespace anon1 {
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//! [integral_shorthands]
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auto two = int_<2>;
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auto yes = bool_<true>;
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//! [integral_shorthands]
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}
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namespace anon2 {
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//! [literals]
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using namespace literals; // <-- mandatory to use the _c suffix!
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BOOST_HANA_CONSTANT_ASSERT(1234_c == llong<1234>);
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BOOST_HANA_CONSTANT_ASSERT(-1234_c == llong<-1234>);
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//! [literals]
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}
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//! [integral_operators]
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BOOST_HANA_CONSTANT_ASSERT(int_<1> == integral<int, 1>);
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BOOST_HANA_CONSTANT_ASSERT(int_<1> + long_<2> == long_<3>);
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BOOST_HANA_CONSTANT_ASSERT(!(bool_<true> && bool_<false>));
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//! [integral_operators]
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int main() { }
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