/*
@copyright Louis Dionne 2014
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/list/instance.hpp>

#include <cassert>
#include <sstream>
#include <string>
using namespace boost::hana;


int main() {
    //! [main]
    auto to_string = [](auto x) { return (std::ostringstream{} << x).str(); };

    auto show = [=](auto x, auto y) {
        return "(" + to_string(x) + " + " + to_string(y) + ")";
    };

    assert(foldr(show, "4", list(1, "2", '3')) == "(1 + (2 + (3 + 4)))");
    //! [main]
}