123456789101112131415161718192021222324252627282930313233343536 |
- // 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/first.hpp>
- #include <boost/hana/functional/on.hpp>
- #include <boost/hana/integral_constant.hpp>
- #include <boost/hana/less.hpp>
- #include <boost/hana/pair.hpp>
- #include <boost/hana/plus.hpp>
- #include <boost/hana/sort.hpp>
- #include <boost/hana/tuple.hpp>
- #include <boost/hana/type.hpp>
- namespace hana = boost::hana;
- // infix application
- constexpr auto sorted = hana::sort.by(hana::less ^hana::on^ hana::first, hana::make_tuple(
- hana::make_pair(hana::int_c<3>, 'x'),
- hana::make_pair(hana::int_c<1>, hana::type_c<void>),
- hana::make_pair(hana::int_c<2>, 9876)
- ));
- static_assert(sorted == hana::make_tuple(
- hana::make_pair(hana::int_c<1>, hana::type_c<void>),
- hana::make_pair(hana::int_c<2>, 9876),
- hana::make_pair(hana::int_c<3>, 'x')
- ), "");
- // function call syntax
- constexpr auto x = hana::make_pair(1, 2);
- constexpr auto y = hana::make_pair(10, 20);
- static_assert(hana::on(hana::plus, hana::first)(x, y) == 1 + 10, "");
- int main() { }
|