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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/equal.hpp>
- #include <boost/hana/scan_right.hpp>
- #include <boost/hana/tuple.hpp>
- #include <sstream>
- namespace hana = boost::hana;
- auto to_string = [](auto x) {
- std::ostringstream ss;
- ss << x;
- return ss.str();
- };
- auto f = [](auto element, auto state) {
- return "f(" + to_string(element) + ", " + to_string(state) + ")";
- };
- int main() {
- // with initial state
- BOOST_HANA_RUNTIME_CHECK(hana::scan_right(hana::make_tuple(1, "2", '3'), 4, f) == hana::make_tuple(
- "f(1, f(2, f(3, 4)))",
- "f(2, f(3, 4))",
- "f(3, 4)",
- 4
- ));
- // without initial state
- BOOST_HANA_RUNTIME_CHECK(hana::scan_right(hana::make_tuple(1, "2", '3'), f) == hana::make_tuple(
- "f(1, f(2, 3))",
- "f(2, 3)",
- '3'
- ));
- }
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