1 // Copyright Louis Dionne 2013-2017 2 // Distributed under the Boost Software License, Version 1.0. 3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) 4 5 #include <boost/hana/assert.hpp> 6 #include <boost/hana/at_key.hpp> 7 #include <boost/hana/equal.hpp> 8 #include <boost/hana/find.hpp> 9 #include <boost/hana/integral_constant.hpp> 10 #include <boost/hana/optional.hpp> 11 #include <boost/hana/set.hpp> 12 namespace hana = boost::hana; 13 14 main()15int main() { 16 constexpr auto xs = hana::make_set(hana::int_c<0>, hana::int_c<1>, hana::int_c<2>); 17 BOOST_HANA_CONSTANT_CHECK(hana::find(xs, hana::int_c<0>) == hana::just(hana::int_c<0>)); 18 BOOST_HANA_CONSTANT_CHECK(hana::find(xs, hana::int_c<3>) == hana::nothing); 19 20 // operator[] is equivalent to at_key 21 BOOST_HANA_CONSTANT_CHECK(xs[hana::int_c<2>] == hana::int_c<2>); 22 23 // long_c<0> == int_<0>, and therefore int_<0> is found 24 BOOST_HANA_CONSTANT_CHECK(xs[hana::long_c<0>] == hana::int_c<0>); 25 } 26