e9e1c88ed9
Summary: LWG 3158 marks the allocator_arg_t constructor of std::tuple as conditionnally explicit based on whether the default constructors of the tuple's members are explicitly default constructible. Reviewers: EricWF, mclow.lists Subscribers: christof, jkorous, dexonsmith, libcxx-commits Tags: #libc Differential Revision: https://reviews.llvm.org/D65232 llvm-svn: 372778
34 lines
959 B
C++
34 lines
959 B
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++98, c++03
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// <tuple>
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// template <class... Types> class tuple;
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// template <class Alloc>
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// explicit(see-below) tuple(allocator_arg_t, const Alloc& a);
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// Make sure we get the explicit-ness of the constructor right.
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// This is LWG 3158.
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#include <tuple>
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#include <memory>
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struct ExplicitDefault { explicit ExplicitDefault() { } };
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std::tuple<ExplicitDefault> explicit_default_test() {
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return {std::allocator_arg, std::allocator<int>()}; // expected-error {{chosen constructor is explicit in copy-initialization}}
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}
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int main(int, char**) {
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return 0;
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}
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