18e9b48c4c
`[[nodiscard]]` should be applied to functions where discarding the return value is most likely a correctness issue. - https://libcxx.llvm.org/CodingGuidelines.html - https://wg21.link/tuple
57 lines
2.2 KiB
C++
57 lines
2.2 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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// UNSUPPORTED: c++03, c++11
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// Make sure that we don't blow up the template instantiation recursion depth
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// for tuples of size <= 512.
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#include <tuple>
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#include <cassert>
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#include <utility>
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#include "test_macros.h"
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template <std::size_t... I>
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constexpr void CreateTuple(std::index_sequence<I...>) {
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using LargeTuple = std::tuple<std::integral_constant<std::size_t, I>...>;
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using TargetTuple = std::tuple<decltype(I)...>;
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LargeTuple tuple(std::integral_constant<std::size_t, I>{}...);
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auto e1 = std::get<0>(tuple);
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assert(e1.value == 0);
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auto e2 = std::get<sizeof...(I) - 1>(tuple);
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assert(e2.value == sizeof...(I) - 1);
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TargetTuple t1 = tuple; // converting copy constructor from &
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TargetTuple t2 = static_cast<LargeTuple const&>(tuple); // converting copy constructor from const&
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TargetTuple t3 = std::move(tuple); // converting rvalue constructor
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TargetTuple t4 = static_cast<LargeTuple const&&>(tuple); // converting const rvalue constructor
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TargetTuple t5; // default constructor
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(void)t1; (void)t2; (void)t3; (void)t4; (void)t5;
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#if TEST_STD_VER >= 20
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t1 = tuple; // converting assignment from &
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t1 = static_cast<LargeTuple const&>(tuple); // converting assignment from const&
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t1 = std::move(tuple); // converting assignment from &&
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t1 = static_cast<LargeTuple const&&>(tuple); // converting assignment from const&&
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swap(t1, t2); // swap
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#endif
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// t1 == tuple; // comparison does not work yet (we blow the constexpr stack)
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}
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constexpr bool test() {
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CreateTuple(std::make_index_sequence<512>{});
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test(), "");
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return 0;
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}
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