115 lines
3.2 KiB
C++
115 lines
3.2 KiB
C++
// Copyright Louis Dionne 2013-2017
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <boost/hana/assert.hpp>
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#include <boost/hana/tuple.hpp>
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#include <type_traits>
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namespace hana = boost::hana;
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struct MoveOnly {
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int data_;
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MoveOnly(MoveOnly const&) = delete;
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MoveOnly& operator=(MoveOnly const&) = delete;
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MoveOnly(int data = 1) : data_(data) { }
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MoveOnly(MoveOnly&& x) : data_(x.data_) { x.data_ = 0; }
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MoveOnly& operator=(MoveOnly&& x)
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{ data_ = x.data_; x.data_ = 0; return *this; }
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int get() const {return data_;}
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bool operator==(const MoveOnly& x) const { return data_ == x.data_; }
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bool operator< (const MoveOnly& x) const { return data_ < x.data_; }
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};
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struct Empty { };
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struct A {
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int id_;
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explicit constexpr A(int i) : id_(i) {}
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};
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struct NoDefault { NoDefault() = delete; };
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int main() {
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{
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hana::tuple<MoveOnly> t(MoveOnly(0));
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 0);
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}
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{
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hana::tuple<MoveOnly, MoveOnly> t(MoveOnly(0), MoveOnly(1));
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 0);
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == 1);
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}
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{
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hana::tuple<MoveOnly, MoveOnly, MoveOnly> t(
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MoveOnly(0), MoveOnly(1), MoveOnly(2)
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);
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 0);
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == 1);
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<2>(t) == 2);
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}
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{
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constexpr hana::tuple<Empty> t0{Empty()}; (void)t0;
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}
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{
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constexpr hana::tuple<A, A> t(3, 2);
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static_assert(hana::at_c<0>(t).id_ == 3, "");
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}
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{
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typedef hana::tuple<MoveOnly, NoDefault> Tuple;
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static_assert(!std::is_constructible<
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Tuple,
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MoveOnly
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>::value, "");
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static_assert(std::is_constructible<
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Tuple,
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MoveOnly, NoDefault
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>::value, "");
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}
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{
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typedef hana::tuple<MoveOnly, MoveOnly, NoDefault> Tuple;
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static_assert(!std::is_constructible<
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Tuple,
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MoveOnly, MoveOnly
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>::value, "");
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static_assert(std::is_constructible<
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Tuple,
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MoveOnly, MoveOnly, NoDefault
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>::value, "");
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}
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{
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typedef hana::tuple<MoveOnly, NoDefault> Tuple;
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typedef hana::tuple<MoveOnly, Tuple, MoveOnly, MoveOnly> NestedTuple;
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static_assert(!std::is_constructible<
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NestedTuple,
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MoveOnly, MoveOnly, MoveOnly, MoveOnly
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>::value, "");
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static_assert(std::is_constructible<
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NestedTuple,
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MoveOnly, Tuple, MoveOnly, MoveOnly
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>::value, "");
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}
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{
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typedef hana::tuple<MoveOnly, int> Tuple;
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typedef hana::tuple<MoveOnly, Tuple, MoveOnly, MoveOnly> NestedTuple;
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static_assert(!std::is_constructible<
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NestedTuple,
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MoveOnly, MoveOnly, MoveOnly, MoveOnly
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>::value, "");
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static_assert(std::is_constructible<
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NestedTuple,
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MoveOnly, Tuple, MoveOnly, MoveOnly
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>::value, "");
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}
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}
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