123456789101112131415161718192021222324252627282930313233343536373839 |
- // 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/at.hpp>
- #include <boost/hana/fold_right.hpp>
- #include <boost/hana/tuple.hpp>
- namespace hana = boost::hana;
- //
- // Make sure that we can fold_right and take arguments by reference.
- //
- int main() {
- // with state
- {
- auto xs = hana::make_tuple(1, 2, 3);
- int state = 99;
- int& one = hana::fold_right(xs, state, [](int& i, int&) -> int& {
- return i;
- });
- BOOST_HANA_RUNTIME_CHECK(one == 1);
- one = 10;
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(xs) == 10);
- }
- // without state
- {
- auto xs = hana::make_tuple(1, 2, 3);
- int& one = hana::fold_right(xs, [](int& i, int&) -> int& {
- return i;
- });
- BOOST_HANA_RUNTIME_CHECK(one == 1);
- one = 10;
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(xs) == 10);
- }
- }
|