| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <tuple> |
| |
| // template <class... Types> class tuple; |
| |
| // template <class... UTypes> |
| // explicit tuple(UTypes&&... u); |
| |
| // UNSUPPORTED: c++98, c++03 |
| |
| #include <tuple> |
| #include <cassert> |
| #include <type_traits> |
| |
| #include "MoveOnly.h" |
| |
| #if _LIBCPP_STD_VER > 11 |
| |
| struct Empty {}; |
| struct A |
| { |
| int id_; |
| explicit constexpr A(int i) : id_(i) {} |
| }; |
| |
| #endif |
| |
| struct NoDefault { NoDefault() = delete; }; |
| |
| // Make sure the _Up... constructor SFINAEs out when the types that |
| // are not explicitly initialized are not all default constructible. |
| // Otherwise, std::is_constructible would return true but instantiating |
| // the constructor would fail. |
| void test_default_constructible_extension_sfinae() |
| { |
| { |
| typedef std::tuple<MoveOnly, NoDefault> Tuple; |
| |
| static_assert(!std::is_constructible< |
| Tuple, |
| MoveOnly |
| >::value, ""); |
| |
| static_assert(std::is_constructible< |
| Tuple, |
| MoveOnly, NoDefault |
| >::value, ""); |
| } |
| { |
| typedef std::tuple<MoveOnly, MoveOnly, NoDefault> Tuple; |
| |
| static_assert(!std::is_constructible< |
| Tuple, |
| MoveOnly, MoveOnly |
| >::value, ""); |
| |
| static_assert(std::is_constructible< |
| Tuple, |
| MoveOnly, MoveOnly, NoDefault |
| >::value, ""); |
| } |
| { |
| // Same idea as above but with a nested tuple type. |
| typedef std::tuple<MoveOnly, NoDefault> Tuple; |
| typedef std::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, ""); |
| } |
| // testing extensions |
| #ifdef _LIBCPP_VERSION |
| { |
| typedef std::tuple<MoveOnly, int> Tuple; |
| typedef std::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, ""); |
| } |
| #endif |
| } |
| |
| int main() |
| { |
| { |
| std::tuple<MoveOnly> t(MoveOnly(0)); |
| assert(std::get<0>(t) == 0); |
| } |
| { |
| std::tuple<MoveOnly, MoveOnly> t(MoveOnly(0), MoveOnly(1)); |
| assert(std::get<0>(t) == 0); |
| assert(std::get<1>(t) == 1); |
| } |
| { |
| std::tuple<MoveOnly, MoveOnly, MoveOnly> t(MoveOnly(0), |
| MoveOnly(1), |
| MoveOnly(2)); |
| assert(std::get<0>(t) == 0); |
| assert(std::get<1>(t) == 1); |
| assert(std::get<2>(t) == 2); |
| } |
| // extensions |
| #ifdef _LIBCPP_VERSION |
| { |
| std::tuple<MoveOnly, MoveOnly, MoveOnly> t(MoveOnly(0), |
| MoveOnly(1)); |
| assert(std::get<0>(t) == 0); |
| assert(std::get<1>(t) == 1); |
| assert(std::get<2>(t) == MoveOnly()); |
| } |
| { |
| std::tuple<MoveOnly, MoveOnly, MoveOnly> t(MoveOnly(0)); |
| assert(std::get<0>(t) == 0); |
| assert(std::get<1>(t) == MoveOnly()); |
| assert(std::get<2>(t) == MoveOnly()); |
| } |
| #endif |
| #if TEST_STD_VER > 11 |
| { |
| constexpr std::tuple<Empty> t0{Empty()}; |
| } |
| { |
| constexpr std::tuple<A, A> t(3, 2); |
| static_assert(std::get<0>(t).id_ == 3, ""); |
| } |
| #endif |
| // Check that SFINAE is properly applied with the default reduced arity |
| // constructor extensions. |
| test_default_constructible_extension_sfinae(); |
| } |