82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
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// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SUPPORT_VARIANT_TEST_HELPERS_HPP
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#define SUPPORT_VARIANT_TEST_HELPERS_HPP
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#include <type_traits>
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#include <utility>
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#include <cassert>
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#include "test_macros.h"
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#if TEST_STD_VER <= 14
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#error This file requires C++17
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#endif
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// FIXME: Currently the variant<T&> tests are disabled using this macro.
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#define TEST_VARIANT_HAS_NO_REFERENCES
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#ifndef TEST_HAS_NO_EXCEPTIONS
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struct CopyThrows {
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CopyThrows() = default;
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CopyThrows(CopyThrows const&) { throw 42; }
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CopyThrows& operator=(CopyThrows const&) { throw 42; }
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};
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struct MoveThrows {
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static int alive;
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MoveThrows() { ++alive; }
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MoveThrows(MoveThrows const&) {++alive;}
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MoveThrows(MoveThrows&&) { throw 42; }
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MoveThrows& operator=(MoveThrows const&) { return *this; }
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MoveThrows& operator=(MoveThrows&&) { throw 42; }
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~MoveThrows() { --alive; }
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};
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int MoveThrows::alive = 0;
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struct MakeEmptyT {
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static int alive;
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MakeEmptyT() { ++alive; }
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MakeEmptyT(MakeEmptyT const&) {
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++alive;
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// Don't throw from the copy constructor since variant's assignment
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// operator performs a copy before committing to the assignment.
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}
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MakeEmptyT(MakeEmptyT &&) {
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throw 42;
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}
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MakeEmptyT& operator=(MakeEmptyT const&) {
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throw 42;
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}
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MakeEmptyT& operator=(MakeEmptyT&&) {
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throw 42;
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}
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~MakeEmptyT() { --alive; }
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};
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static_assert(std::is_swappable_v<MakeEmptyT>, ""); // required for test
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int MakeEmptyT::alive = 0;
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template <class Variant>
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void makeEmpty(Variant& v) {
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Variant v2(std::in_place_type<MakeEmptyT>);
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try {
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v = std::move(v2);
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assert(false);
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} catch (...) {
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assert(v.valueless_by_exception());
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}
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}
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#endif // TEST_HAS_NO_EXCEPTIONS
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#endif // SUPPORT_VARIANT_TEST_HELPERS_HPP
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