pfr/test/run/std_interactions.cpp

// Copyright (c) 2016-2021 Antony Polukhin
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#include <boost/pfr/core.hpp>

#include <boost/core/lightweight_test.hpp>

namespace helper {
    template <std::size_t I, class T>
    decltype(auto) get(T&& v) {
        return boost::pfr::get<I>(std::forward<T>(v));
    }
}

int main() {
    using namespace std;
    using namespace helper;
    struct foo { int i; short s;};

    foo f{1, 2};
    BOOST_TEST_EQ(get<0>(f), 1);

    const foo cf{1, 2};
    BOOST_TEST_EQ(get<1>(cf), 2);

    std::tuple<int, short> t{10, 20};
    BOOST_TEST_EQ(get<0>(t), 10);

    const std::tuple<int, short> ct{10, 20};
    BOOST_TEST_EQ(get<1>(ct), 20);

    return boost::report_errors();
}