617b446176
[P1789R3](https://isocpp.org/files/papers/P1789R3.pdf) was accepted for C++26 through LWG motion 14 at the 2025 Kona meeting. This patch implements it, along with tests and documentation changes. Closes #167268 --------- Co-authored-by: Tsche <che@pydong.org>
35 lines
1.5 KiB
C++
35 lines
1.5 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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// REQUIRES: std-at-least-c++26
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// <utility>
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// template<size_t I, class T, T... Values>
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// struct tuple_element<I, integer_sequence<T, Values...>>;
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// template<size_t I, class T, T... Values>
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// struct tuple_element<I, const integer_sequence<T, Values...>>;
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// template<size_t I, class T, T... Values>
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// constexpr T get(integer_sequence<T, Values...>) noexcept;
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// Expect failures for tuple_element and get with empty integer_sequence
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#include <utility>
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void test() {
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// expected-error-re@*:* {{static assertion failed{{.*}}Index out of bounds in std::tuple_element<> (std::integer_sequence)}}
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using test1 = std::tuple_element_t<0, std::integer_sequence<int>>;
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// expected-error-re@*:* {{static assertion failed{{.*}}Index out of bounds in std::tuple_element<> (const std::integer_sequence)}}
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using test2 = std::tuple_element_t<0, const std::integer_sequence<int>>;
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std::integer_sequence<int> empty;
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// expected-error-re@*:* {{static assertion failed{{.*}}Index out of bounds in std::get<> (std::integer_sequence)}}
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// expected-error-re@*:* {{invalid index 0 for pack {{.*}} of size 0}}
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(void)std::get<0>(empty);
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}
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