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549 lines
16 KiB
C++
549 lines
16 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, c++14
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// <variant>
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// template <class ...Types> class variant;
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// constexpr variant& operator=(variant&&) noexcept(see below);
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#include <cassert>
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#include <string>
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#include <type_traits>
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#include <utility>
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#include <variant>
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#include "test_macros.h"
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#include "variant_test_helpers.h"
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struct NoCopy {
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NoCopy(const NoCopy&) = delete;
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NoCopy& operator=(const NoCopy&) = default;
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};
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struct CopyOnly {
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CopyOnly(const CopyOnly&) = default;
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CopyOnly(CopyOnly&&) = delete;
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CopyOnly& operator=(const CopyOnly&) = default;
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CopyOnly& operator=(CopyOnly&&) = delete;
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};
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struct MoveOnly {
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MoveOnly(const MoveOnly&) = delete;
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MoveOnly(MoveOnly&&) = default;
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MoveOnly& operator=(const MoveOnly&) = delete;
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MoveOnly& operator=(MoveOnly&&) = default;
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};
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struct MoveOnlyNT {
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MoveOnlyNT(const MoveOnlyNT&) = delete;
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MoveOnlyNT(MoveOnlyNT&&) {}
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MoveOnlyNT& operator=(const MoveOnlyNT&) = delete;
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MoveOnlyNT& operator=(MoveOnlyNT&&) = default;
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};
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struct MoveOnlyOddNothrow {
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MoveOnlyOddNothrow(MoveOnlyOddNothrow&&) noexcept(false) {}
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MoveOnlyOddNothrow(const MoveOnlyOddNothrow&) = delete;
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MoveOnlyOddNothrow& operator=(MoveOnlyOddNothrow&&) noexcept = default;
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MoveOnlyOddNothrow& operator=(const MoveOnlyOddNothrow&) = delete;
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};
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struct MoveAssignOnly {
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MoveAssignOnly(MoveAssignOnly&&) = delete;
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MoveAssignOnly& operator=(MoveAssignOnly&&) = default;
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};
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struct MoveAssign {
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constexpr MoveAssign(int v, int* move_ctor, int* move_assi)
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: value(v), move_construct(move_ctor), move_assign(move_assi) {}
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constexpr MoveAssign(MoveAssign&& o) : value(o.value), move_construct(o.move_construct), move_assign(o.move_assign) {
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++*move_construct;
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o.value = -1;
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}
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constexpr MoveAssign& operator=(MoveAssign&& o) {
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value = o.value;
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move_construct = o.move_construct;
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move_assign = o.move_assign;
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++*move_assign;
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o.value = -1;
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return *this;
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}
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int value;
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int* move_construct;
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int* move_assign;
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};
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struct NTMoveAssign {
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constexpr NTMoveAssign(int v) : value(v) {}
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NTMoveAssign(const NTMoveAssign&) = default;
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NTMoveAssign(NTMoveAssign&&) = default;
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NTMoveAssign& operator=(const NTMoveAssign& that) = default;
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NTMoveAssign& operator=(NTMoveAssign&& that) {
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value = that.value;
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that.value = -1;
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return *this;
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};
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int value;
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};
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static_assert(!std::is_trivially_move_assignable<NTMoveAssign>::value, "");
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static_assert(std::is_move_assignable<NTMoveAssign>::value, "");
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struct TMoveAssign {
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constexpr TMoveAssign(int v) : value(v) {}
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TMoveAssign(const TMoveAssign&) = delete;
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TMoveAssign(TMoveAssign&&) = default;
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TMoveAssign& operator=(const TMoveAssign&) = delete;
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TMoveAssign& operator=(TMoveAssign&&) = default;
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int value;
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};
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static_assert(std::is_trivially_move_assignable<TMoveAssign>::value, "");
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struct TMoveAssignNTCopyAssign {
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constexpr TMoveAssignNTCopyAssign(int v) : value(v) {}
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TMoveAssignNTCopyAssign(const TMoveAssignNTCopyAssign&) = default;
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TMoveAssignNTCopyAssign(TMoveAssignNTCopyAssign&&) = default;
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TMoveAssignNTCopyAssign& operator=(const TMoveAssignNTCopyAssign& that) {
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value = that.value;
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return *this;
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}
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TMoveAssignNTCopyAssign& operator=(TMoveAssignNTCopyAssign&&) = default;
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int value;
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};
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static_assert(std::is_trivially_move_assignable_v<TMoveAssignNTCopyAssign>, "");
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struct TrivialCopyNontrivialMove {
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TrivialCopyNontrivialMove(TrivialCopyNontrivialMove const&) = default;
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TrivialCopyNontrivialMove(TrivialCopyNontrivialMove&&) noexcept {}
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TrivialCopyNontrivialMove& operator=(TrivialCopyNontrivialMove const&) = default;
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TrivialCopyNontrivialMove& operator=(TrivialCopyNontrivialMove&&) noexcept { return *this; }
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};
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static_assert(std::is_trivially_copy_assignable_v<TrivialCopyNontrivialMove>, "");
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static_assert(!std::is_trivially_move_assignable_v<TrivialCopyNontrivialMove>, "");
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constexpr void test_move_assignment_noexcept() {
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{
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using V = std::variant<int>;
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static_assert(std::is_nothrow_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<MoveOnly>;
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static_assert(std::is_nothrow_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<int, long>;
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static_assert(std::is_nothrow_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<int, MoveOnly>;
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static_assert(std::is_nothrow_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<MoveOnlyNT>;
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static_assert(!std::is_nothrow_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<MoveOnlyOddNothrow>;
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static_assert(!std::is_nothrow_move_assignable<V>::value, "");
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}
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}
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constexpr void test_move_assignment_sfinae() {
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{
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using V = std::variant<int, long>;
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static_assert(std::is_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<int, CopyOnly>;
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static_assert(std::is_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<int, NoCopy>;
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static_assert(!std::is_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<int, MoveOnly>;
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static_assert(std::is_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<int, MoveOnlyNT>;
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static_assert(std::is_move_assignable<V>::value, "");
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}
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{
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// variant only provides move assignment when the types also provide
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// a move constructor.
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using V = std::variant<int, MoveAssignOnly>;
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static_assert(!std::is_move_assignable<V>::value, "");
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}
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// Make sure we properly propagate triviality (see P0602R4).
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{
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using V = std::variant<int, long>;
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static_assert(std::is_trivially_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<int, NTMoveAssign>;
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static_assert(!std::is_trivially_move_assignable<V>::value, "");
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static_assert(std::is_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<int, TMoveAssign>;
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static_assert(std::is_trivially_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<int, TMoveAssignNTCopyAssign>;
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static_assert(std::is_trivially_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<int, TrivialCopyNontrivialMove>;
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static_assert(!std::is_trivially_move_assignable<V>::value, "");
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}
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{
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using V = std::variant<int, CopyOnly>;
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static_assert(std::is_trivially_move_assignable<V>::value, "");
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}
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}
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void test_move_assignment_empty_empty() {
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#ifndef TEST_HAS_NO_EXCEPTIONS
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using MET = MakeEmptyT;
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{
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using V = std::variant<int, long, MET>;
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V v1(std::in_place_index<0>);
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makeEmpty(v1);
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V v2(std::in_place_index<0>);
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makeEmpty(v2);
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V& vref = (v1 = std::move(v2));
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assert(&vref == &v1);
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assert(v1.valueless_by_exception());
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assert(v1.index() == std::variant_npos);
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}
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#endif // TEST_HAS_NO_EXCEPTIONS
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}
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void test_move_assignment_non_empty_empty() {
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#ifndef TEST_HAS_NO_EXCEPTIONS
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using MET = MakeEmptyT;
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{
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using V = std::variant<int, MET>;
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V v1(std::in_place_index<0>, 42);
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V v2(std::in_place_index<0>);
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makeEmpty(v2);
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V& vref = (v1 = std::move(v2));
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assert(&vref == &v1);
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assert(v1.valueless_by_exception());
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assert(v1.index() == std::variant_npos);
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}
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{
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using V = std::variant<int, MET, std::string>;
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V v1(std::in_place_index<2>, "hello");
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V v2(std::in_place_index<0>);
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makeEmpty(v2);
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V& vref = (v1 = std::move(v2));
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assert(&vref == &v1);
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assert(v1.valueless_by_exception());
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assert(v1.index() == std::variant_npos);
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}
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#endif // TEST_HAS_NO_EXCEPTIONS
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}
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void test_move_assignment_empty_non_empty() {
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#ifndef TEST_HAS_NO_EXCEPTIONS
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using MET = MakeEmptyT;
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{
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using V = std::variant<int, MET>;
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V v1(std::in_place_index<0>);
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makeEmpty(v1);
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V v2(std::in_place_index<0>, 42);
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V& vref = (v1 = std::move(v2));
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assert(&vref == &v1);
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assert(v1.index() == 0);
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assert(std::get<0>(v1) == 42);
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}
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{
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using V = std::variant<int, MET, std::string>;
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V v1(std::in_place_index<0>);
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makeEmpty(v1);
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V v2(std::in_place_type<std::string>, "hello");
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V& vref = (v1 = std::move(v2));
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assert(&vref == &v1);
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assert(v1.index() == 2);
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assert(std::get<2>(v1) == "hello");
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}
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#endif // TEST_HAS_NO_EXCEPTIONS
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}
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template <typename T>
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struct Result {
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std::size_t index;
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T value;
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};
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TEST_CONSTEXPR_CXX20 void test_move_assignment_same_index() {
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{
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using V = std::variant<int>;
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V v1(43);
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V v2(42);
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V& vref = (v1 = std::move(v2));
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assert(&vref == &v1);
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assert(v1.index() == 0);
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assert(std::get<0>(v1) == 42);
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}
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{
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using V = std::variant<int, long, unsigned>;
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V v1(43l);
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V v2(42l);
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V& vref = (v1 = std::move(v2));
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assert(&vref == &v1);
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assert(v1.index() == 1);
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assert(std::get<1>(v1) == 42);
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}
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{
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using V = std::variant<int, MoveAssign, unsigned>;
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int move_construct = 0;
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int move_assign = 0;
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V v1(std::in_place_type<MoveAssign>, 43, &move_construct, &move_assign);
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V v2(std::in_place_type<MoveAssign>, 42, &move_construct, &move_assign);
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V& vref = (v1 = std::move(v2));
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assert(&vref == &v1);
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assert(v1.index() == 1);
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assert(std::get<1>(v1).value == 42);
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assert(move_construct == 0);
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assert(move_assign == 1);
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}
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// Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
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{
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struct {
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constexpr Result<int> operator()() const {
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using V = std::variant<int>;
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V v(43);
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V v2(42);
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v = std::move(v2);
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return {v.index(), std::get<0>(v)};
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}
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} test;
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constexpr auto result = test();
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static_assert(result.index == 0, "");
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static_assert(result.value == 42, "");
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}
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{
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struct {
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constexpr Result<long> operator()() const {
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using V = std::variant<int, long, unsigned>;
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V v(43l);
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V v2(42l);
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v = std::move(v2);
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return {v.index(), std::get<1>(v)};
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}
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} test;
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constexpr auto result = test();
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static_assert(result.index == 1, "");
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static_assert(result.value == 42l, "");
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}
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{
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struct {
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constexpr Result<int> operator()() const {
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using V = std::variant<int, TMoveAssign, unsigned>;
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V v(std::in_place_type<TMoveAssign>, 43);
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V v2(std::in_place_type<TMoveAssign>, 42);
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v = std::move(v2);
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return {v.index(), std::get<1>(v).value};
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}
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} test;
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constexpr auto result = test();
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static_assert(result.index == 1, "");
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static_assert(result.value == 42, "");
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}
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}
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TEST_CONSTEXPR_CXX20 void test_move_assignment_different_index() {
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{
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using V = std::variant<int, long, unsigned>;
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V v1(43);
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V v2(42l);
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V& vref = (v1 = std::move(v2));
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assert(&vref == &v1);
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assert(v1.index() == 1);
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assert(std::get<1>(v1) == 42);
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}
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{
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using V = std::variant<int, MoveAssign, unsigned>;
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int move_construct = 0;
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int move_assign = 0;
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V v1(std::in_place_type<unsigned>, 43u);
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V v2(std::in_place_type<MoveAssign>, 42, &move_construct, &move_assign);
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V& vref = (v1 = std::move(v2));
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assert(&vref == &v1);
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assert(v1.index() == 1);
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assert(std::get<1>(v1).value == 42);
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assert(move_construct == 1);
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assert(move_assign == 0);
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}
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// Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
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{
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struct {
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constexpr Result<long> operator()() const {
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using V = std::variant<int, long, unsigned>;
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V v(43);
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V v2(42l);
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v = std::move(v2);
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return {v.index(), std::get<1>(v)};
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}
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} test;
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constexpr auto result = test();
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static_assert(result.index == 1, "");
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static_assert(result.value == 42l, "");
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}
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{
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struct {
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constexpr Result<long> operator()() const {
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using V = std::variant<int, TMoveAssign, unsigned>;
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V v(std::in_place_type<unsigned>, 43u);
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V v2(std::in_place_type<TMoveAssign>, 42);
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v = std::move(v2);
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return {v.index(), std::get<1>(v).value};
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}
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} test;
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constexpr auto result = test();
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static_assert(result.index == 1, "");
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static_assert(result.value == 42, "");
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}
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}
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void test_assignment_throw() {
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#ifndef TEST_HAS_NO_EXCEPTIONS
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using MET = MakeEmptyT;
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// same index
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{
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using V = std::variant<int, MET, std::string>;
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V v1(std::in_place_type<MET>);
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MET& mref = std::get<1>(v1);
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V v2(std::in_place_type<MET>);
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try {
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v1 = std::move(v2);
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assert(false);
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} catch (...) {
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}
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assert(v1.index() == 1);
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assert(&std::get<1>(v1) == &mref);
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}
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// different indices
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{
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using V = std::variant<int, MET, std::string>;
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V v1(std::in_place_type<int>);
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V v2(std::in_place_type<MET>);
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try {
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v1 = std::move(v2);
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assert(false);
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} catch (...) {
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}
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assert(v1.valueless_by_exception());
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assert(v1.index() == std::variant_npos);
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}
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{
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using V = std::variant<int, MET, std::string>;
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V v1(std::in_place_type<MET>);
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V v2(std::in_place_type<std::string>, "hello");
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V& vref = (v1 = std::move(v2));
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assert(&vref == &v1);
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assert(v1.index() == 2);
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assert(std::get<2>(v1) == "hello");
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}
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#endif // TEST_HAS_NO_EXCEPTIONS
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}
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template <std::size_t NewIdx, class T, class ValueType>
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constexpr void test_constexpr_assign_imp(T&& v, ValueType&& new_value) {
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using Variant = std::decay_t<T>;
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Variant v2(std::forward<ValueType>(new_value));
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const auto cp = v2;
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v = std::move(v2);
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assert(v.index() == NewIdx);
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assert(std::get<NewIdx>(v) == std::get<NewIdx>(cp));
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}
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constexpr void test_constexpr_move_assignment_trivial() {
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// Make sure we properly propagate triviality, which implies constexpr-ness (see P0602R4).
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using V = std::variant<long, void*, int>;
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static_assert(std::is_trivially_copyable<V>::value, "");
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static_assert(std::is_trivially_move_assignable<V>::value, "");
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test_constexpr_assign_imp<0>(V(42l), 101l);
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|
test_constexpr_assign_imp<0>(V(nullptr), 101l);
|
|
test_constexpr_assign_imp<1>(V(42l), nullptr);
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|
test_constexpr_assign_imp<2>(V(42l), 101);
|
|
}
|
|
|
|
struct NonTrivialMoveAssign {
|
|
int i = 0;
|
|
constexpr NonTrivialMoveAssign(int ii) : i(ii) {}
|
|
constexpr NonTrivialMoveAssign(const NonTrivialMoveAssign& other) = default;
|
|
constexpr NonTrivialMoveAssign(NonTrivialMoveAssign&& other) : i(other.i) {}
|
|
constexpr NonTrivialMoveAssign& operator=(const NonTrivialMoveAssign&) = default;
|
|
constexpr NonTrivialMoveAssign& operator=(NonTrivialMoveAssign&& o) {
|
|
i = o.i;
|
|
return *this;
|
|
}
|
|
TEST_CONSTEXPR_CXX20 ~NonTrivialMoveAssign() = default;
|
|
friend constexpr bool operator==(const NonTrivialMoveAssign& x, const NonTrivialMoveAssign& y) { return x.i == y.i; }
|
|
};
|
|
|
|
TEST_CONSTEXPR_CXX20 void test_constexpr_move_assignment_non_trivial() {
|
|
using V = std::variant<long, void*, NonTrivialMoveAssign>;
|
|
static_assert(!std::is_trivially_copyable<V>::value);
|
|
static_assert(!std::is_trivially_move_assignable<V>::value);
|
|
test_constexpr_assign_imp<0>(V(42l), 101l);
|
|
test_constexpr_assign_imp<0>(V(nullptr), 101l);
|
|
test_constexpr_assign_imp<1>(V(42l), nullptr);
|
|
test_constexpr_assign_imp<2>(V(42l), NonTrivialMoveAssign(5));
|
|
test_constexpr_assign_imp<2>(V(NonTrivialMoveAssign(3)), NonTrivialMoveAssign(5));
|
|
}
|
|
|
|
void non_constexpr_test() {
|
|
test_move_assignment_empty_empty();
|
|
test_move_assignment_non_empty_empty();
|
|
test_move_assignment_empty_non_empty();
|
|
test_assignment_throw();
|
|
}
|
|
|
|
constexpr bool cxx17_constexpr_test() {
|
|
test_move_assignment_sfinae();
|
|
test_move_assignment_noexcept();
|
|
test_constexpr_move_assignment_trivial();
|
|
|
|
return true;
|
|
}
|
|
|
|
TEST_CONSTEXPR_CXX20 bool cxx20_constexpr_test() {
|
|
test_move_assignment_same_index();
|
|
test_move_assignment_different_index();
|
|
test_constexpr_move_assignment_non_trivial();
|
|
|
|
return true;
|
|
}
|
|
|
|
int main(int, char**) {
|
|
non_constexpr_test();
|
|
cxx17_constexpr_test();
|
|
cxx20_constexpr_test();
|
|
|
|
static_assert(cxx17_constexpr_test());
|
|
#if TEST_STD_VER >= 20
|
|
static_assert(cxx20_constexpr_test());
|
|
#endif
|
|
return 0;
|
|
}
|