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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/assert.hpp>
- #include <boost/hana/tuple.hpp>
- #include <type_traits>
- namespace hana = boost::hana;
- struct MoveOnly {
- int data_;
- MoveOnly(MoveOnly const&) = delete;
- MoveOnly& operator=(MoveOnly const&) = delete;
- MoveOnly(int data = 1) : data_(data) { }
- MoveOnly(MoveOnly&& x) : data_(x.data_) { x.data_ = 0; }
- MoveOnly& operator=(MoveOnly&& x)
- { data_ = x.data_; x.data_ = 0; return *this; }
- int get() const {return data_;}
- bool operator==(const MoveOnly& x) const { return data_ == x.data_; }
- bool operator< (const MoveOnly& x) const { return data_ < x.data_; }
- };
- struct Empty { };
- struct A {
- int id_;
- explicit constexpr A(int i) : id_(i) {}
- };
- struct NoDefault { NoDefault() = delete; };
- int main() {
- {
- hana::tuple<MoveOnly> t(MoveOnly(0));
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 0);
- }
- {
- hana::tuple<MoveOnly, MoveOnly> t(MoveOnly(0), MoveOnly(1));
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 0);
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == 1);
- }
- {
- hana::tuple<MoveOnly, MoveOnly, MoveOnly> t(
- MoveOnly(0), MoveOnly(1), MoveOnly(2)
- );
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 0);
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == 1);
- BOOST_HANA_RUNTIME_CHECK(hana::at_c<2>(t) == 2);
- }
- {
- constexpr hana::tuple<Empty> t0{Empty()}; (void)t0;
- }
- {
- constexpr hana::tuple<A, A> t(3, 2);
- static_assert(hana::at_c<0>(t).id_ == 3, "");
- }
- {
- typedef hana::tuple<MoveOnly, NoDefault> Tuple;
- static_assert(!std::is_constructible<
- Tuple,
- MoveOnly
- >::value, "");
- static_assert(std::is_constructible<
- Tuple,
- MoveOnly, NoDefault
- >::value, "");
- }
- {
- typedef hana::tuple<MoveOnly, MoveOnly, NoDefault> Tuple;
- static_assert(!std::is_constructible<
- Tuple,
- MoveOnly, MoveOnly
- >::value, "");
- static_assert(std::is_constructible<
- Tuple,
- MoveOnly, MoveOnly, NoDefault
- >::value, "");
- }
- {
- typedef hana::tuple<MoveOnly, NoDefault> Tuple;
- typedef hana::tuple<MoveOnly, Tuple, MoveOnly, MoveOnly> NestedTuple;
- static_assert(!std::is_constructible<
- NestedTuple,
- MoveOnly, MoveOnly, MoveOnly, MoveOnly
- >::value, "");
- static_assert(std::is_constructible<
- NestedTuple,
- MoveOnly, Tuple, MoveOnly, MoveOnly
- >::value, "");
- }
- {
- typedef hana::tuple<MoveOnly, int> Tuple;
- typedef hana::tuple<MoveOnly, Tuple, MoveOnly, MoveOnly> NestedTuple;
- static_assert(!std::is_constructible<
- NestedTuple,
- MoveOnly, MoveOnly, MoveOnly, MoveOnly
- >::value, "");
- static_assert(std::is_constructible<
- NestedTuple,
- MoveOnly, Tuple, MoveOnly, MoveOnly
- >::value, "");
- }
- }
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