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Diffstat (limited to 'src/boost/libs/hana/test/ext/std/tuple/issue_90.cpp')
-rw-r--r-- | src/boost/libs/hana/test/ext/std/tuple/issue_90.cpp | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/ext/std/tuple/issue_90.cpp b/src/boost/libs/hana/test/ext/std/tuple/issue_90.cpp new file mode 100644 index 000000000..dfbb4a7fc --- /dev/null +++ b/src/boost/libs/hana/test/ext/std/tuple/issue_90.cpp @@ -0,0 +1,73 @@ +// 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/at.hpp> +#include <boost/hana/at_key.hpp> +#include <boost/hana/back.hpp> +#include <boost/hana/ext/std/tuple.hpp> +#include <boost/hana/front.hpp> +#include <boost/hana/integral_constant.hpp> + +#include <tuple> +#include <utility> +namespace hana = boost::hana; + + +template <typename T> +T const& cref(T& t) { return t; } + +// a non-movable, non-copyable type +struct RefOnly { + RefOnly() = default; + RefOnly(RefOnly const&) = delete; + RefOnly(RefOnly&&) = delete; +}; + +template <int i> +struct RefOnly_i : hana::int_<i> { + RefOnly_i() = default; + RefOnly_i(RefOnly_i const&) = delete; + RefOnly_i(RefOnly_i&&) = delete; +}; + +int main() { + std::tuple<RefOnly> t; + + // Make sure that we return the proper reference types from `at`. + { + RefOnly&& r1 = hana::at_c<0>(std::move(t)); + RefOnly& r2 = hana::at_c<0>(t); + RefOnly const& r3 = hana::at_c<0>(cref(t)); + + (void)r1; (void)r2; (void)r3; + } + + // Make sure we return the proper reference types from `front`. + { + RefOnly&& r1 = hana::front(std::move(t)); + RefOnly& r2 = hana::front(t); + RefOnly const& r3 = hana::front(cref(t)); + + (void)r1; (void)r2; (void)r3; + } + + // Make sure we return the proper reference types from `back`. + { + RefOnly&& r1 = hana::back(std::move(t)); + RefOnly& r2 = hana::back(t); + RefOnly const& r3 = hana::back(cref(t)); + + (void)r1; (void)r2; (void)r3; + } + + // Make sure we return the proper reference types from `at_key`. + { + std::tuple<RefOnly_i<3>> t{}; + RefOnly_i<3>& r1 = hana::at_key(t, RefOnly_i<3>{}); + RefOnly_i<3> const& r2 = hana::at_key(cref(t), RefOnly_i<3>{}); + RefOnly_i<3>&& r3 = hana::at_key(std::move(t), RefOnly_i<3>{}); + + (void)r1; (void)r2; (void)r3; + } +} |