Differential D116621 Diff 439539 libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/convert_non_const_copy.pass.cpp

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libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/convert_non_const_copy.pass.cpp

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				//===----------------------------------------------------------------------===//
				//
				// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
				// See https://llvm.org/LICENSE.txt for license information.
				// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
				//
				//===----------------------------------------------------------------------===//

				// <tuple>

				// template <class... Types>
				// template <class... UTypes>
				// constexpr explicit(see below) tuple<Types>::tuple(tuple<UTypes...>&);
				//
				// Constraints:
				// sizeof...(Types) equals sizeof...(UTypes) &&
				// (is_constructible_v<Types, decltype(get<I>(FWD(u)))> && ...) is true &&
				// (
				// sizeof...(Types) is not 1 \|\|
				// (
				// !is_convertible_v<decltype(u), T> &&
				// !is_constructible_v<T, decltype(u)> &&
				// !is_same_v<T, U>
				// )
				// )

				// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20

				#include <cassert>
				#include <tuple>

				#include "convert_types.h"
				#include "test_macros.h"

				// test: The expression inside explicit is equivalent to:
				// !(is_convertible_v<decltype(get<I>(FWD(u))), Types> && ...)
				static_assert(std::is_convertible_v<std::tuple<MutableCopy>&, std::tuple<ConvertibleFrom<MutableCopy>>>);

				static_assert(std::is_convertible_v<std::tuple<MutableCopy, MutableCopy>&,
				std::tuple<ConvertibleFrom<MutableCopy>, ConvertibleFrom<MutableCopy>>>);

				static_assert(!std::is_convertible_v<std::tuple<MutableCopy>&, std::tuple<ExplicitConstructibleFrom<MutableCopy>>>);

				static_assert(!std::is_convertible_v<std::tuple<MutableCopy, MutableCopy>&,
				std::tuple<ConvertibleFrom<MutableCopy>, ExplicitConstructibleFrom<MutableCopy>>>);

				constexpr bool test() {
				// test implicit conversions.
				// sizeof...(Types) == 1
				{
				std::tuple<MutableCopy> t1{1};
				std::tuple<ConvertibleFrom<MutableCopy>> t2 = t1;
				assert(std::get<0>(t2).v.val == 1);
				}

				// test implicit conversions.
				// sizeof...(Types) > 1
				{
				std::tuple<MutableCopy, int> t1{1, 2};
				std::tuple<ConvertibleFrom<MutableCopy>, int> t2 = t1;
				assert(std::get<0>(t2).v.val == 1);
				assert(std::get<1>(t2) == 2);
				}

				// test explicit conversions.
				// sizeof...(Types) == 1
				{
				std::tuple<MutableCopy> t1{1};
				std::tuple<ExplicitConstructibleFrom<MutableCopy>> t2{t1};
				assert(std::get<0>(t2).v.val == 1);
				}

				// test explicit conversions.
				// sizeof...(Types) > 1
				{
				std::tuple<MutableCopy, int> t1{1, 2};
				std::tuple<ExplicitConstructibleFrom<MutableCopy>, int> t2{t1};
				assert(std::get<0>(t2).v.val == 1);
				assert(std::get<1>(t2) == 2);
				}

				// test constraints

				// sizeof...(Types) != sizeof...(UTypes)
				static_assert(!std::is_constructible_v<std::tuple<int, int>, std::tuple<int>&>);
				static_assert(!std::is_constructible_v<std::tuple<int>, std::tuple<int, int>&>);
				static_assert(!std::is_constructible_v<std::tuple<int, int, int>, std::tuple<int, int>&>);

				// !(is_constructible_v<Types, decltype(get<I>(FWD(u)))> && ...)
				static_assert(!std::is_constructible_v<std::tuple<int, NoConstructorFromInt>, std::tuple<int, int>&>);

				// sizeof...(Types) == 1 && other branch of "\|\|" satisfied
				{
				std::tuple<TracedCopyMove> t1{};
				std::tuple<ConvertibleFrom<TracedCopyMove>> t2{t1};
				assert(nonConstCopyCtrCalled(std::get<0>(t2).v));
				}

				// sizeof...(Types) == 1 && is_same_v<T, U>
				{
				std::tuple<TracedCopyMove> t1{};
				std::tuple<TracedCopyMove> t2{t1};
				assert(!nonConstCopyCtrCalled(std::get<0>(t2)));
				}

				// sizeof...(Types) != 1
				{
				std::tuple<TracedCopyMove, TracedCopyMove> t1{};
				std::tuple<TracedCopyMove, TracedCopyMove> t2{t1};
				assert(nonConstCopyCtrCalled(std::get<0>(t2)));
				}

				// These two test points cause gcc to ICE
				#if !defined(TEST_COMPILER_GCC)
				// sizeof...(Types) == 1 && is_convertible_v<decltype(u), T>
				{
				std::tuple<CvtFromTupleRef> t1{};
				std::tuple<ConvertibleFrom<CvtFromTupleRef>> t2{t1};
				assert(!nonConstCopyCtrCalled(std::get<0>(t2).v));
				}

				// sizeof...(Types) == 1 && is_constructible_v<decltype(u), T>
				{
				std::tuple<ExplicitCtrFromTupleRef> t1{};
				std::tuple<ConvertibleFrom<ExplicitCtrFromTupleRef>> t2{t1};
				assert(!nonConstCopyCtrCalled(std::get<0>(t2).v));
				}
				#endif
				return true;
				}

				int main(int, char**) {
				test();
				static_assert(test());
				return 0;
				}