26 lines
753 B
C++
26 lines
753 B
C++
// Copyright Louis Dionne 2013-2017
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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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#include <boost/hana/assert.hpp>
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#include <boost/hana/ext/std/integer_sequence.hpp>
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#include <boost/hana/unpack.hpp>
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#include <tuple>
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#include <utility>
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namespace hana = boost::hana;
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auto add = [](auto a, auto b, auto c) { return a + b + c; };
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int main() {
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std::tuple<int, long, double> tuple{1, 2l, 3.3};
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auto sum = hana::unpack(std::integer_sequence<int, 0, 1, 2>{}, [&](auto ...i) {
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// the `i`s are `std::integral_constant<int, ...>`s
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return add(std::get<decltype(i)::value>(tuple)...);
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});
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BOOST_HANA_RUNTIME_CHECK(sum == 6.3);
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}
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