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1 // Copyright Louis Dionne 2013-2017
2 // Distributed under the Boost Software License, Version 1.0.
3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
5 #include <boost/hana/assert.hpp>
6 #include <boost/hana/equal.hpp>
7 #include <boost/hana/scan_left.hpp>
8 #include <boost/hana/tuple.hpp>
11 namespace hana
= boost::hana
;
14 auto to_string
= [](auto x
) {
15 std::ostringstream ss
;
20 auto f
= [](auto state
, auto element
) {
21 return "f(" + to_string(state
) + ", " + to_string(element
) + ")";
26 BOOST_HANA_RUNTIME_CHECK(hana::scan_left(hana::make_tuple(2, "3", '4'), 1, f
) == hana::make_tuple(
33 // without initial state
34 BOOST_HANA_RUNTIME_CHECK(hana::scan_left(hana::make_tuple(1, "2", '3'), f
) == hana::make_tuple(