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- // 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/assert.hpp>
- #include <boost/hana/ext/std/integer_sequence.hpp>
- #include <boost/hana/unpack.hpp>
- #include <tuple>
- #include <utility>
- namespace hana = boost::hana;
- auto add = [](auto a, auto b, auto c) { return a + b + c; };
- int main() {
- std::tuple<int, long, double> tuple{1, 2l, 3.3};
- auto sum = hana::unpack(std::integer_sequence<int, 0, 1, 2>{}, [&](auto ...i) {
- // the `i`s are `std::integral_constant<int, ...>`s
- return add(std::get<decltype(i)::value>(tuple)...);
- });
- BOOST_HANA_RUNTIME_CHECK(sum == 6.3);
- }
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