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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/tuple.hpp>
- #include <utility>
- namespace hana = boost::hana;
- // a non-movable, non-copyable type
- struct RefOnly {
- RefOnly() = default;
- RefOnly(RefOnly const&) = delete;
- RefOnly(RefOnly&&) = delete;
- };
- struct Empty { };
- int main() {
- // Make sure we can create a tuple of rvalue references
- {
- RefOnly e{};
- hana::tuple<RefOnly&&> xs{std::move(e)};
- hana::tuple<RefOnly&&, RefOnly&&> ys{std::move(e), std::move(e)};
- (void)xs; (void)ys;
- hana::tuple<RefOnly&&> xs2 = {std::move(e)};
- hana::tuple<RefOnly&&, RefOnly&&> ys2 = {std::move(e), std::move(e)};
- (void)xs2; (void)ys2;
- }
- // Make sure we can create a tuple of non-const lvalue references
- {
- RefOnly e{};
- hana::tuple<RefOnly&> xs{e};
- hana::tuple<RefOnly&, RefOnly&> ys{e, e};
- (void)xs; (void)ys;
- hana::tuple<RefOnly&> xs2 = {e};
- hana::tuple<RefOnly&, RefOnly&> ys2 = {e, e};
- (void)xs2; (void)ys2;
- }
- // Make sure we can create a tuple of const lvalue references
- {
- RefOnly const e{};
- hana::tuple<RefOnly const&> xs{e};
- hana::tuple<RefOnly const&, RefOnly const&> ys{e, e};
- (void)xs; (void)ys;
- hana::tuple<RefOnly const&> xs2 = {e};
- hana::tuple<RefOnly const&, RefOnly const&> ys2 = {e, e};
- (void)xs2; (void)ys2;
- }
- // Try to construct tuples with mixed references and non-reference members.
- {
- RefOnly r{};
- Empty e{};
- {
- hana::tuple<RefOnly const&, Empty> xs{r, e};
- hana::tuple<RefOnly const&, Empty> ys = {r, e};
- (void)xs; (void)ys;
- }
- {
- hana::tuple<RefOnly&, Empty> xs{r, e};
- hana::tuple<RefOnly&, Empty> ys = {r, e};
- (void)xs; (void)ys;
- }
- {
- hana::tuple<RefOnly&&, Empty> xs{std::move(r), e};
- hana::tuple<RefOnly&&, Empty> ys = {std::move(r), e};
- (void)xs; (void)ys;
- }
- }
- }
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