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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/chain.hpp>
- #include <boost/hana/equal.hpp>
- #include <boost/hana/tap.hpp>
- #include <boost/hana/tuple.hpp>
- #include <set>
- namespace hana = boost::hana;
- int main() {
- // We use a sorted container because the order in which the functions
- // are called is unspecified.
- std::set<int> before, after;
- auto xs = hana::make_tuple(1, 2, 3)
- | hana::tap<hana::tuple_tag>([&](int x) { before.insert(x); })
- | [](auto x) { return hana::make_tuple(x, -x); }
- | hana::tap<hana::tuple_tag>([&](int x) { after.insert(x); });
- BOOST_HANA_RUNTIME_CHECK(before == std::set<int>{1, 2, 3});
- BOOST_HANA_RUNTIME_CHECK(after == std::set<int>{1, -1, 2, -2, 3, -3});
- BOOST_HANA_RUNTIME_CHECK(xs == hana::make_tuple(1, -1, 2, -2, 3, -3));
- }
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