| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | // UNSUPPORTED: no-exceptions |
| 10 | // <deque> |
| 11 | |
| 12 | // void push_front(const value_type& x); |
| 13 | |
| 14 | #include <deque> |
| 15 | #include <cassert> |
| 16 | #include "test_macros.h" |
| 17 | #include "test_allocator.h" |
| 18 | |
| 19 | // Flag that makes the copy constructor for CMyClass throw an exception |
| 20 | static bool gCopyConstructorShouldThrow = false; |
| 21 | |
| 22 | class CMyClass { |
| 23 | public: |
| 24 | CMyClass(int tag); |
| 25 | |
| 26 | public: |
| 27 | CMyClass(const CMyClass& iOther); |
| 28 | |
| 29 | public: |
| 30 | ~CMyClass(); |
| 31 | |
| 32 | bool equal(const CMyClass& rhs) const { return fTag == rhs.fTag && fMagicValue == rhs.fMagicValue; } |
| 33 | |
| 34 | private: |
| 35 | int fMagicValue; |
| 36 | int fTag; |
| 37 | |
| 38 | private: |
| 39 | static int kStartedConstructionMagicValue; |
| 40 | |
| 41 | private: |
| 42 | static int kFinishedConstructionMagicValue; |
| 43 | }; |
| 44 | |
| 45 | // Value for fMagicValue when the constructor has started running, but not yet finished |
| 46 | int CMyClass::kStartedConstructionMagicValue = 0; |
| 47 | // Value for fMagicValue when the constructor has finished running |
| 48 | int CMyClass::kFinishedConstructionMagicValue = 12345; |
| 49 | |
| 50 | CMyClass::CMyClass(int tag) : fMagicValue(kStartedConstructionMagicValue), fTag(tag) { |
| 51 | // Signal that the constructor has finished running |
| 52 | fMagicValue = kFinishedConstructionMagicValue; |
| 53 | } |
| 54 | |
| 55 | CMyClass::CMyClass(const CMyClass& iOther) : fMagicValue(kStartedConstructionMagicValue), fTag(iOther.fTag) { |
| 56 | // If requested, throw an exception _before_ setting fMagicValue to kFinishedConstructionMagicValue |
| 57 | if (gCopyConstructorShouldThrow) { |
| 58 | throw std::exception(); |
| 59 | } |
| 60 | // Signal that the constructor has finished running |
| 61 | fMagicValue = kFinishedConstructionMagicValue; |
| 62 | } |
| 63 | |
| 64 | CMyClass::~CMyClass() { |
| 65 | // Only instances for which the constructor has finished running should be destructed |
| 66 | assert(fMagicValue == kFinishedConstructionMagicValue); |
| 67 | } |
| 68 | |
| 69 | bool operator==(const CMyClass& lhs, const CMyClass& rhs) { return lhs.equal(rhs); } |
| 70 | |
| 71 | int main(int, char**) { |
| 72 | CMyClass instance(42); |
| 73 | { |
| 74 | std::deque<CMyClass> vec; |
| 75 | |
| 76 | vec.push_front(x: instance); |
| 77 | std::deque<CMyClass> vec2(vec); |
| 78 | |
| 79 | gCopyConstructorShouldThrow = true; |
| 80 | try { |
| 81 | vec.push_front(x: instance); |
| 82 | assert(false); |
| 83 | } catch (...) { |
| 84 | gCopyConstructorShouldThrow = false; |
| 85 | assert(vec == vec2); |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | { |
| 90 | test_allocator_statistics alloc_stats; |
| 91 | typedef std::deque<CMyClass, test_allocator<CMyClass> > C; |
| 92 | C vec((test_allocator<CMyClass>(&alloc_stats))); |
| 93 | C vec2(vec, test_allocator<CMyClass>(&alloc_stats)); |
| 94 | |
| 95 | alloc_stats.throw_after = 1; |
| 96 | try { |
| 97 | vec.push_front(instance); |
| 98 | assert(false); |
| 99 | } catch (...) { |
| 100 | assert(vec == vec2); |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | return 0; |
| 105 | } |
| 106 |