620 lines
21 KiB
C++
620 lines
21 KiB
C++
// { dg-options "-std=gnu++17" }
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// { dg-do compile { target c++17 } }
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// Copyright (C) 2016-2021 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#include <variant>
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#include <string>
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#include <vector>
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using namespace std;
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struct AllDeleted
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{
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AllDeleted() = delete;
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AllDeleted(const AllDeleted&) = delete;
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AllDeleted(AllDeleted&&) = delete;
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AllDeleted& operator=(const AllDeleted&) = delete;
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AllDeleted& operator=(AllDeleted&&) = delete;
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};
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struct Empty
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{
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Empty() { };
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Empty(const Empty&) { };
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Empty(Empty&&) { };
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Empty& operator=(const Empty&) { return *this; };
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Empty& operator=(Empty&&) { return *this; };
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};
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struct DefaultNoexcept
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{
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DefaultNoexcept() noexcept = default;
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DefaultNoexcept(const DefaultNoexcept&) noexcept = default;
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DefaultNoexcept(DefaultNoexcept&&) noexcept = default;
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DefaultNoexcept& operator=(const DefaultNoexcept&) noexcept = default;
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DefaultNoexcept& operator=(DefaultNoexcept&&) noexcept = default;
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};
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struct MoveCtorOnly
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{
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MoveCtorOnly() noexcept = delete;
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MoveCtorOnly(const MoveCtorOnly&) noexcept = delete;
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MoveCtorOnly(MoveCtorOnly&&) noexcept { }
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MoveCtorOnly& operator=(const MoveCtorOnly&) noexcept = delete;
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MoveCtorOnly& operator=(MoveCtorOnly&&) noexcept = delete;
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};
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struct MoveCtorAndSwapOnly : MoveCtorOnly { };
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void swap(MoveCtorAndSwapOnly&, MoveCtorAndSwapOnly&) { }
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struct DeletedMoves
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{
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DeletedMoves() = default;
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DeletedMoves(const DeletedMoves&) = default;
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DeletedMoves(DeletedMoves&&) = delete;
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DeletedMoves& operator=(const DeletedMoves&) = default;
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DeletedMoves& operator=(DeletedMoves&&) = delete;
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};
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struct nonliteral
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{
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nonliteral() { }
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bool operator<(const nonliteral&) const;
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bool operator<=(const nonliteral&) const;
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bool operator==(const nonliteral&) const;
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bool operator!=(const nonliteral&) const;
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bool operator>=(const nonliteral&) const;
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bool operator>(const nonliteral&) const;
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};
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struct virtual_default_dtor {
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virtual ~virtual_default_dtor() = default;
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};
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void default_ctor()
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{
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static_assert(is_default_constructible_v<variant<int, string>>);
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static_assert(is_default_constructible_v<variant<string, string>>);
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static_assert(!is_default_constructible_v<variant<AllDeleted, string>>);
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static_assert(is_default_constructible_v<variant<string, AllDeleted>>);
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static_assert(is_default_constructible_v<variant<DeletedMoves>>);
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static_assert(noexcept(variant<int>()));
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static_assert(!noexcept(variant<Empty>()));
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static_assert(noexcept(variant<DefaultNoexcept>()));
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{
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variant<virtual_default_dtor> a;
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}
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}
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void copy_ctor()
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{
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static_assert(is_copy_constructible_v<variant<int, string>>);
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static_assert(!is_copy_constructible_v<variant<AllDeleted, string>>);
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static_assert(is_trivially_copy_constructible_v<variant<int>>);
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static_assert(!is_trivially_copy_constructible_v<variant<std::string>>);
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static_assert(is_trivially_copy_constructible_v<variant<DeletedMoves>>);
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{
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variant<int> a;
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static_assert(noexcept(variant<int>(a)));
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}
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{
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variant<string> a;
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static_assert(!noexcept(variant<string>(a)));
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}
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{
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variant<int, string> a;
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static_assert(!noexcept(variant<int, string>(a)));
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}
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{
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variant<int, char> a;
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static_assert(noexcept(variant<int, char>(a)));
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}
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}
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void move_ctor()
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{
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static_assert(is_move_constructible_v<variant<int, string>>);
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static_assert(!is_move_constructible_v<variant<AllDeleted, string>>);
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static_assert(is_move_constructible_v<variant<int, DeletedMoves>>); // uses copy ctor
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static_assert(is_trivially_move_constructible_v<variant<int>>);
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static_assert(!is_trivially_move_constructible_v<variant<std::string>>);
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static_assert(!noexcept(variant<int, Empty>(declval<variant<int, Empty>>())));
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static_assert(noexcept(variant<int, DefaultNoexcept>(declval<variant<int, DefaultNoexcept>>())));
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}
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void arbitrary_ctor()
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{
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static_assert(!is_constructible_v<variant<string, string>, const char*>);
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static_assert(is_constructible_v<variant<int, string>, const char*>);
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static_assert(noexcept(variant<int, Empty>(int{})));
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static_assert(noexcept(variant<int, DefaultNoexcept>(int{})));
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static_assert(!noexcept(variant<int, Empty>(Empty{})));
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static_assert(noexcept(variant<int, DefaultNoexcept>(DefaultNoexcept{})));
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// P0608R3 disallow narrowing conversions and boolean conversions
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static_assert(!is_constructible_v<variant<float>, int>);
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static_assert(!is_constructible_v<variant<float, vector<int>>, int>);
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static_assert(is_constructible_v<variant<float, int>, char>);
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static_assert(!is_constructible_v<variant<float, char>, int>);
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static_assert(is_constructible_v<variant<float, long>, int>);
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struct big_int { big_int(int) { } };
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static_assert(is_constructible_v<variant<float, big_int>, int>);
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static_assert(!is_constructible_v<variant<int>, unsigned>);
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static_assert(!is_constructible_v<variant<bool>, int>);
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static_assert(!is_constructible_v<variant<bool>, void*>);
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// P1957R2 Converting from T* to bool should be considered narrowing
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struct ConvertibleToBool
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{
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operator bool() const { return true; }
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};
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static_assert(is_constructible_v<variant<bool>, ConvertibleToBool>);
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static_assert(is_constructible_v<variant<bool, int>, ConvertibleToBool>);
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}
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struct none { none() = delete; };
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struct any { template <typename T> any(T&&) {} };
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void in_place_index_ctor()
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{
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variant<string, string> a(in_place_index<0>, "a");
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variant<string, string> b(in_place_index<1>, {'a'});
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static_assert(!is_constructible_v<variant<none, any>, std::in_place_index_t<0>>, "PR libstdc++/90165");
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}
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void in_place_type_ctor()
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{
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variant<int, string, int> a(in_place_type<string>, "a");
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variant<int, string, int> b(in_place_type<string>, {'a'});
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static_assert(!is_constructible_v<variant<string, string>, in_place_type_t<string>, const char*>);
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static_assert(!is_constructible_v<variant<none, any>, std::in_place_type_t<none>>, "PR libstdc++/90165");
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}
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void dtor()
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{
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static_assert(is_destructible_v<variant<int, string>>);
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static_assert(is_destructible_v<variant<AllDeleted, string>>);
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}
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void copy_assign()
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{
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static_assert(is_copy_assignable_v<variant<int, string>>);
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static_assert(!is_copy_assignable_v<variant<AllDeleted, string>>);
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static_assert(is_trivially_copy_assignable_v<variant<int>>);
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static_assert(!is_trivially_copy_assignable_v<variant<string>>);
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static_assert(is_trivially_copy_assignable_v<variant<DeletedMoves>>);
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{
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variant<Empty> a;
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static_assert(!noexcept(a = a));
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}
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{
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variant<DefaultNoexcept> a;
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static_assert(noexcept(a = a));
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}
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}
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void move_assign()
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{
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static_assert(is_move_assignable_v<variant<int, string>>);
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static_assert(!is_move_assignable_v<variant<AllDeleted, string>>);
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static_assert(is_move_assignable_v<variant<int, DeletedMoves>>); // uses copy assignment
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static_assert(is_trivially_move_assignable_v<variant<int>>);
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static_assert(!is_trivially_move_assignable_v<variant<string>>);
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{
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variant<Empty> a;
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static_assert(!noexcept(a = std::move(a)));
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}
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{
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variant<DefaultNoexcept> a;
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static_assert(noexcept(a = std::move(a)));
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}
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}
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void arbitrary_assign()
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{
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static_assert(!is_assignable_v<variant<string, string>, const char*>);
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static_assert(is_assignable_v<variant<int, string>, const char*>);
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static_assert(noexcept(variant<int, Empty>() = int{}));
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static_assert(noexcept(variant<int, DefaultNoexcept>() = int{}));
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static_assert(!noexcept(variant<int, Empty>() = Empty{}));
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static_assert(noexcept(variant<int, DefaultNoexcept>() = DefaultNoexcept{}));
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}
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void test_get()
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{
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static_assert(is_same<decltype(get<0>(variant<int, string>())), int&&>::value);
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static_assert(is_same<decltype(get<1>(variant<int, string>())), string&&>::value);
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static_assert(is_same<decltype(get<1>(variant<int, const string>())), const string&&>::value);
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static_assert(is_same<decltype(get<int>(variant<int, string>())), int&&>::value);
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static_assert(is_same<decltype(get<string>(variant<int, string>())), string&&>::value);
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static_assert(is_same<decltype(get<const string>(variant<int, const string>())), const string&&>::value);
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}
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void test_relational()
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{
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{
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constexpr variant<int, nonliteral> a(42), b(43);
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static_assert((a < b));
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static_assert(!(a > b));
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static_assert((a <= b));
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static_assert(!(a == b));
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static_assert((a != b));
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static_assert(!(a >= b));
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}
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{
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constexpr variant<int, nonliteral> a(42), b(42);
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static_assert(!(a < b));
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static_assert(!(a > b));
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static_assert((a <= b));
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static_assert((a == b));
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static_assert(!(a != b));
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static_assert((a >= b));
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}
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{
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constexpr variant<int, nonliteral> a(43), b(42);
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static_assert(!(a < b));
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static_assert((a > b));
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static_assert(!(a <= b));
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static_assert(!(a == b));
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static_assert((a != b));
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static_assert((a >= b));
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}
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{
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constexpr monostate a, b;
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static_assert(!(a < b));
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static_assert(!(a > b));
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static_assert((a <= b));
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static_assert((a == b));
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static_assert(!(a != b));
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static_assert((a >= b));
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}
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}
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// Not swappable, and variant<C> not swappable via the generic std::swap.
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struct C { };
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void swap(C&, C&) = delete;
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static_assert( !std::is_swappable_v<variant<C>> );
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static_assert( !std::is_swappable_v<variant<int, C>> );
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static_assert( !std::is_swappable_v<variant<C, int>> );
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// Not swappable, and variant<D> not swappable via the generic std::swap.
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struct D { D(D&&) = delete; };
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static_assert( !std::is_swappable_v<variant<D>> );
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static_assert( !std::is_swappable_v<variant<int, D>> );
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static_assert( !std::is_swappable_v<variant<D, int>> );
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void test_swap()
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{
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static_assert(is_swappable_v<variant<int, string>>);
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static_assert(!is_swappable_v<variant<MoveCtorOnly>>);
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static_assert(is_swappable_v<variant<MoveCtorAndSwapOnly>>);
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static_assert(!is_swappable_v<variant<AllDeleted>>);
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}
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void test_visit()
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{
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{
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struct Visitor
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{
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void operator()(monostate) {}
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void operator()(const int&) {}
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};
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struct CVisitor
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{
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void operator()(monostate) const {}
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void operator()(const int&) const {}
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};
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}
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{
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struct Visitor
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{
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bool operator()(int, float) { return false; }
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bool operator()(int, double) { return false; }
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bool operator()(char, float) { return false; }
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bool operator()(char, double) { return false; }
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};
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visit(Visitor(), variant<int, char>(), variant<float, double>());
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}
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{
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struct Visitor
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{
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constexpr bool operator()(const int&) { return true; }
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constexpr bool operator()(const nonliteral&) { return false; }
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};
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static_assert(visit(Visitor(), variant<int, nonliteral>(0)));
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}
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{
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struct Visitor
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{
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constexpr bool operator()(const int&) { return true; }
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constexpr bool operator()(const nonliteral&) { return false; }
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};
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static_assert(visit(Visitor(), variant<int, nonliteral>(0)));
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}
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// PR libstdc++/79513
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{
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std::variant<int> v [[gnu::unused]] (5);
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std::visit([](int&){}, v);
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std::visit([](int&&){}, std::move(v));
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}
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}
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void test_constexpr()
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{
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constexpr variant<int> a;
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static_assert(holds_alternative<int>(a));
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constexpr variant<int, char> b(in_place_index<0>, int{});
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static_assert(holds_alternative<int>(b));
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constexpr variant<int, char> c(in_place_type<int>, int{});
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static_assert(holds_alternative<int>(c));
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constexpr variant<int, char> d(in_place_index<1>, char{});
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static_assert(holds_alternative<char>(d));
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constexpr variant<int, char> e(in_place_type<char>, char{});
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static_assert(holds_alternative<char>(e));
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constexpr variant<int, char> f(char{});
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static_assert(holds_alternative<char>(f));
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{
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struct literal {
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constexpr literal() = default;
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};
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constexpr variant<literal, nonliteral> v{};
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constexpr variant<literal, nonliteral> v1{in_place_type<literal>};
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constexpr variant<literal, nonliteral> v2{in_place_index<0>};
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}
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{
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constexpr variant<int> a(42);
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static_assert(get<0>(a) == 42);
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}
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{
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constexpr variant<int, nonliteral> a(42);
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static_assert(get<0>(a) == 42);
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}
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{
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constexpr variant<nonliteral, int> a(42);
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static_assert(get<1>(a) == 42);
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}
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{
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constexpr variant<int> a(42);
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static_assert(get<int>(a) == 42);
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}
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{
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constexpr variant<int, nonliteral> a(42);
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static_assert(get<int>(a) == 42);
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}
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{
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constexpr variant<nonliteral, int> a(42);
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static_assert(get<int>(a) == 42);
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}
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{
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constexpr variant<int> a(42);
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static_assert(get<0>(std::move(a)) == 42);
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}
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{
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constexpr variant<int, nonliteral> a(42);
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static_assert(get<0>(std::move(a)) == 42);
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}
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{
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constexpr variant<nonliteral, int> a(42);
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static_assert(get<1>(std::move(a)) == 42);
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}
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{
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constexpr variant<int> a(42);
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static_assert(get<int>(std::move(a)) == 42);
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}
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{
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constexpr variant<int, nonliteral> a(42);
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static_assert(get<int>(std::move(a)) == 42);
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}
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{
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constexpr variant<nonliteral, int> a(42);
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static_assert(get<int>(std::move(a)) == 42);
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}
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}
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void test_pr77641()
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{
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struct X {
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constexpr X() { }
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};
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constexpr std::variant<X> v1 = X{};
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}
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namespace adl_trap
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{
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struct X {
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X() = default;
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X(int) { }
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X(std::initializer_list<int>, const X&) { }
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};
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template<typename T> void move(T&) { }
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template<typename T> void forward(T&) { }
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struct Visitor {
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template<typename T> void operator()(T&&) { }
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};
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}
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void test_adl()
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{
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using adl_trap::X;
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X x;
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std::initializer_list<int> il;
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adl_trap::Visitor vis;
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std::variant<X> v0(x);
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v0 = x;
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v0.emplace<0>(x);
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v0.emplace<0>(il, x);
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visit(vis, v0);
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variant<X> v1{in_place_index<0>, x};
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variant<X> v2{in_place_type<X>, x};
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variant<X> v3{in_place_index<0>, il, x};
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variant<X> v4{in_place_type<X>, il, x};
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}
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void test_variant_alternative()
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{
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static_assert(is_same_v<variant_alternative_t<0, variant<int, string>>, int>);
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static_assert(is_same_v<variant_alternative_t<1, variant<int, string>>, string>);
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|
|
static_assert(is_same_v<variant_alternative_t<0, const variant<int>>, const int>);
|
|
static_assert(is_same_v<variant_alternative_t<0, volatile variant<int>>, volatile int>);
|
|
static_assert(is_same_v<variant_alternative_t<0, const volatile variant<int>>, const volatile int>);
|
|
}
|
|
|
|
template<typename V, typename T>
|
|
constexpr auto has_type_emplace(int) -> decltype((declval<V>().template emplace<T>(), true))
|
|
{ return true; };
|
|
|
|
template<typename V, typename T>
|
|
constexpr bool has_type_emplace(...)
|
|
{ return false; };
|
|
|
|
template<typename V, size_t N>
|
|
constexpr auto has_index_emplace(int) -> decltype((declval<V>().template emplace<N>(), true))
|
|
{ return true; };
|
|
|
|
template<typename V, size_t T>
|
|
constexpr bool has_index_emplace(...)
|
|
{ return false; };
|
|
|
|
void test_emplace()
|
|
{
|
|
static_assert(has_type_emplace<variant<int>, int>(0));
|
|
static_assert(!has_type_emplace<variant<long>, int>(0));
|
|
static_assert(has_index_emplace<variant<int>, 0>(0));
|
|
static_assert(!has_type_emplace<variant<AllDeleted>, AllDeleted>(0));
|
|
static_assert(!has_index_emplace<variant<AllDeleted>, 0>(0));
|
|
static_assert(has_type_emplace<variant<int, AllDeleted>, int>(0));
|
|
static_assert(has_index_emplace<variant<int, AllDeleted>, 0>(0));
|
|
static_assert(has_type_emplace<variant<int, vector<int>, AllDeleted>, vector<int>>(0));
|
|
static_assert(has_index_emplace<variant<int, vector<int>, AllDeleted>, 1>(0));
|
|
|
|
// The above tests only check the emplace members are available for
|
|
// overload resolution. The following odr-uses will instantiate them:
|
|
variant<int, vector<int>, AllDeleted> v;
|
|
v.emplace<0>(1);
|
|
v.emplace<int>(1);
|
|
v.emplace<1>(1, 1);
|
|
v.emplace<vector<int>>(1, 1);
|
|
v.emplace<1>({1, 2, 3, 4});
|
|
v.emplace<vector<int>>({1, 2, 3, 4});
|
|
}
|
|
|
|
void test_triviality()
|
|
{
|
|
#define TEST_TEMPLATE(DT, CC, MC, CA, MA, CC_VAL, MC_VAL, CA_VAL, MA_VAL) \
|
|
{ \
|
|
struct A \
|
|
{ \
|
|
~A() DT; \
|
|
A(const A&) CC; \
|
|
A(A&&) MC; \
|
|
A& operator=(const A&) CA; \
|
|
A& operator=(A&&) MA; \
|
|
}; \
|
|
static_assert(CC_VAL == is_trivially_copy_constructible_v<variant<A>>); \
|
|
static_assert(MC_VAL == is_trivially_move_constructible_v<variant<A>>); \
|
|
static_assert(CA_VAL == is_trivially_copy_assignable_v<variant<A>>); \
|
|
static_assert(MA_VAL == is_trivially_move_assignable_v<variant<A>>); \
|
|
}
|
|
TEST_TEMPLATE(=default, =default, =default, =default, =default, true, true, true, true)
|
|
TEST_TEMPLATE(=default, =default, =default, =default, , true, true, true, false)
|
|
TEST_TEMPLATE(=default, =default, =default, , =default, true, true, false, true)
|
|
TEST_TEMPLATE(=default, =default, =default, , , true, true, false, false)
|
|
TEST_TEMPLATE(=default, =default, , =default, =default, true, false, true, false)
|
|
TEST_TEMPLATE(=default, =default, , =default, , true, false, true, false)
|
|
TEST_TEMPLATE(=default, =default, , , =default, true, false, false, false)
|
|
TEST_TEMPLATE(=default, =default, , , , true, false, false, false)
|
|
TEST_TEMPLATE(=default, , =default, =default, =default, false, true, false, true)
|
|
TEST_TEMPLATE(=default, , =default, =default, , false, true, false, false)
|
|
TEST_TEMPLATE(=default, , =default, , =default, false, true, false, true)
|
|
TEST_TEMPLATE(=default, , =default, , , false, true, false, false)
|
|
TEST_TEMPLATE(=default, , , =default, =default, false, false, false, false)
|
|
TEST_TEMPLATE(=default, , , =default, , false, false, false, false)
|
|
TEST_TEMPLATE(=default, , , , =default, false, false, false, false)
|
|
TEST_TEMPLATE(=default, , , , , false, false, false, false)
|
|
TEST_TEMPLATE( , =default, =default, =default, =default, false, false, false, false)
|
|
TEST_TEMPLATE( , =default, =default, =default, , false, false, false, false)
|
|
TEST_TEMPLATE( , =default, =default, , =default, false, false, false, false)
|
|
TEST_TEMPLATE( , =default, =default, , , false, false, false, false)
|
|
TEST_TEMPLATE( , =default, , =default, =default, false, false, false, false)
|
|
TEST_TEMPLATE( , =default, , =default, , false, false, false, false)
|
|
TEST_TEMPLATE( , =default, , , =default, false, false, false, false)
|
|
TEST_TEMPLATE( , =default, , , , false, false, false, false)
|
|
TEST_TEMPLATE( , , =default, =default, =default, false, false, false, false)
|
|
TEST_TEMPLATE( , , =default, =default, , false, false, false, false)
|
|
TEST_TEMPLATE( , , =default, , =default, false, false, false, false)
|
|
TEST_TEMPLATE( , , =default, , , false, false, false, false)
|
|
TEST_TEMPLATE( , , , =default, =default, false, false, false, false)
|
|
TEST_TEMPLATE( , , , =default, , false, false, false, false)
|
|
TEST_TEMPLATE( , , , , =default, false, false, false, false)
|
|
TEST_TEMPLATE( , , , , , false, false, false, false)
|
|
#undef TEST_TEMPLATE
|
|
|
|
#define TEST_TEMPLATE(CC, MC, CA, MA) \
|
|
{ \
|
|
struct A \
|
|
{ \
|
|
A(const A&) CC; \
|
|
A(A&&) MC; \
|
|
A& operator=(const A&) CA; \
|
|
A& operator=(A&&) MA; \
|
|
}; \
|
|
static_assert(!is_trivially_copy_constructible_v<variant<AllDeleted, A>>); \
|
|
static_assert(!is_trivially_move_constructible_v<variant<AllDeleted, A>>); \
|
|
static_assert(!is_trivially_copy_assignable_v<variant<AllDeleted, A>>); \
|
|
static_assert(!is_trivially_move_assignable_v<variant<AllDeleted, A>>); \
|
|
}
|
|
TEST_TEMPLATE(=default, =default, =default, =default)
|
|
TEST_TEMPLATE(=default, =default, =default, )
|
|
TEST_TEMPLATE(=default, =default, , =default)
|
|
TEST_TEMPLATE(=default, =default, , )
|
|
TEST_TEMPLATE(=default, , =default, =default)
|
|
TEST_TEMPLATE(=default, , =default, )
|
|
TEST_TEMPLATE(=default, , , =default)
|
|
TEST_TEMPLATE(=default, , , )
|
|
TEST_TEMPLATE( , =default, =default, =default)
|
|
TEST_TEMPLATE( , =default, =default, )
|
|
TEST_TEMPLATE( , =default, , =default)
|
|
TEST_TEMPLATE( , =default, , )
|
|
TEST_TEMPLATE( , , =default, =default)
|
|
TEST_TEMPLATE( , , =default, )
|
|
TEST_TEMPLATE( , , , =default)
|
|
TEST_TEMPLATE( , , , )
|
|
#undef TEST_TEMPLATE
|
|
|
|
static_assert(is_trivially_copy_constructible_v<variant<DefaultNoexcept, int, char, float, double>>);
|
|
static_assert(is_trivially_move_constructible_v<variant<DefaultNoexcept, int, char, float, double>>);
|
|
static_assert(is_trivially_copy_assignable_v<variant<DefaultNoexcept, int, char, float, double>>);
|
|
static_assert(is_trivially_move_assignable_v<variant<DefaultNoexcept, int, char, float, double>>);
|
|
}
|