6929bd6d00
This started breaking in the CI because we bumped the Clang version to 14, which requires adjusting the markup in the test suite. I think it's actually nice the we need to do that and that it doesn't happen automatically, since it serves as a reminder that this is broken in Clang.
134 lines
3.6 KiB
C++
134 lines
3.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Triggers a Clang assertion: https://bugs.llvm.org/show_bug.cgi?id=45879
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// UNSUPPORTED: clang-13, clang-14
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// <tuple>
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// template <class... Types> class tuple;
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// template <class... UTypes>
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// tuple& operator=(const tuple<UTypes...>& u);
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// UNSUPPORTED: c++03
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#include <tuple>
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#include <string>
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#include <cassert>
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#include "test_macros.h"
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struct B {
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int id_;
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constexpr explicit B(int i = 0) : id_(i) {}
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};
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struct D : B {
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constexpr explicit D(int i = 0) : B(i) {}
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};
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struct NonAssignable {
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NonAssignable& operator=(NonAssignable const&) = delete;
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NonAssignable& operator=(NonAssignable&&) = delete;
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};
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struct NothrowCopyAssignable {
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NothrowCopyAssignable& operator=(NothrowCopyAssignable const&) noexcept { return *this; }
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};
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struct PotentiallyThrowingCopyAssignable {
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PotentiallyThrowingCopyAssignable& operator=(PotentiallyThrowingCopyAssignable const&) { return *this; }
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};
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TEST_CONSTEXPR_CXX20
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bool test()
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{
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{
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typedef std::tuple<long> T0;
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typedef std::tuple<long long> T1;
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T0 t0(2);
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T1 t1;
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t1 = t0;
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assert(std::get<0>(t1) == 2);
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}
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{
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typedef std::tuple<long, char> T0;
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typedef std::tuple<long long, int> T1;
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T0 t0(2, 'a');
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T1 t1;
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t1 = t0;
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assert(std::get<0>(t1) == 2);
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assert(std::get<1>(t1) == int('a'));
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}
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{
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typedef std::tuple<long, char, D> T0;
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typedef std::tuple<long long, int, B> T1;
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T0 t0(2, 'a', D(3));
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T1 t1;
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t1 = t0;
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assert(std::get<0>(t1) == 2);
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assert(std::get<1>(t1) == int('a'));
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assert(std::get<2>(t1).id_ == 3);
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}
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{
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D d(3);
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D d2(2);
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typedef std::tuple<long, char, D&> T0;
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typedef std::tuple<long long, int, B&> T1;
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T0 t0(2, 'a', d2);
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T1 t1(1, 'b', d);
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t1 = t0;
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assert(std::get<0>(t1) == 2);
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assert(std::get<1>(t1) == int('a'));
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assert(std::get<2>(t1).id_ == 2);
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}
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{
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// Test that tuple evaluates correctly applies an lvalue reference
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// before evaluating is_assignable (i.e. 'is_assignable<int&, int&>')
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// instead of evaluating 'is_assignable<int&&, int&>' which is false.
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int x = 42;
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int y = 43;
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std::tuple<int&&> t(std::move(x));
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std::tuple<int&> t2(y);
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t = t2;
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assert(std::get<0>(t) == 43);
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assert(&std::get<0>(t) == &x);
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}
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return true;
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}
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int main(int, char**)
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{
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test();
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#if TEST_STD_VER >= 20
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static_assert(test());
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#endif
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{
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using T = std::tuple<int, NonAssignable>;
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using U = std::tuple<NonAssignable, int>;
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static_assert(!std::is_assignable<T&, U const&>::value, "");
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static_assert(!std::is_assignable<U&, T const&>::value, "");
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}
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{
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typedef std::tuple<NothrowCopyAssignable, long> T0;
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typedef std::tuple<NothrowCopyAssignable, int> T1;
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static_assert(std::is_nothrow_assignable<T0&, T1 const&>::value, "");
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}
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{
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typedef std::tuple<PotentiallyThrowingCopyAssignable, long> T0;
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typedef std::tuple<PotentiallyThrowingCopyAssignable, int> T1;
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static_assert(std::is_assignable<T0&, T1 const&>::value, "");
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static_assert(!std::is_nothrow_assignable<T0&, T1 const&>::value, "");
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}
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return 0;
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}
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