| 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: CMyClass(int tag); |
| 24 | public: CMyClass(const CMyClass& iOther); |
| 25 | public: ~CMyClass(); |
| 26 | |
| 27 | bool equal(const CMyClass &rhs) const |
| 28 | { return fTag == rhs.fTag && fMagicValue == rhs.fMagicValue; } |
| 29 | private: |
| 30 | int fMagicValue; |
| 31 | int fTag; |
| 32 | |
| 33 | private: static int kStartedConstructionMagicValue; |
| 34 | private: static int kFinishedConstructionMagicValue; |
| 35 | }; |
| 36 | |
| 37 | // Value for fMagicValue when the constructor has started running, but not yet finished |
| 38 | int CMyClass::kStartedConstructionMagicValue = 0; |
| 39 | // Value for fMagicValue when the constructor has finished running |
| 40 | int CMyClass::kFinishedConstructionMagicValue = 12345; |
| 41 | |
| 42 | CMyClass::CMyClass(int tag) : |
| 43 | fMagicValue(kStartedConstructionMagicValue), fTag(tag) |
| 44 | { |
| 45 | // Signal that the constructor has finished running |
| 46 | fMagicValue = kFinishedConstructionMagicValue; |
| 47 | } |
| 48 | |
| 49 | CMyClass::CMyClass(const CMyClass& iOther) : |
| 50 | fMagicValue(kStartedConstructionMagicValue), fTag(iOther.fTag) |
| 51 | { |
| 52 | // If requested, throw an exception _before_ setting fMagicValue to kFinishedConstructionMagicValue |
| 53 | if (gCopyConstructorShouldThrow) { |
| 54 | throw std::exception(); |
| 55 | } |
| 56 | // Signal that the constructor has finished running |
| 57 | fMagicValue = kFinishedConstructionMagicValue; |
| 58 | } |
| 59 | |
| 60 | CMyClass::~CMyClass() { |
| 61 | // Only instances for which the constructor has finished running should be destructed |
| 62 | assert(fMagicValue == kFinishedConstructionMagicValue); |
| 63 | } |
| 64 | |
| 65 | bool operator==(const CMyClass &lhs, const CMyClass &rhs) { return lhs.equal(rhs); } |
| 66 | |
| 67 | int main(int, char**) |
| 68 | { |
| 69 | CMyClass instance(42); |
| 70 | { |
| 71 | std::deque<CMyClass> vec; |
| 72 | |
| 73 | vec.push_front(x: instance); |
| 74 | std::deque<CMyClass> vec2(vec); |
| 75 | |
| 76 | gCopyConstructorShouldThrow = true; |
| 77 | try { |
| 78 | vec.push_front(x: instance); |
| 79 | assert(false); |
| 80 | } |
| 81 | catch (...) { |
| 82 | gCopyConstructorShouldThrow = false; |
| 83 | assert(vec == vec2); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | { |
| 88 | test_allocator_statistics alloc_stats; |
| 89 | typedef std::deque<CMyClass, test_allocator<CMyClass> > C; |
| 90 | C vec((test_allocator<CMyClass>(&alloc_stats))); |
| 91 | C vec2(vec, test_allocator<CMyClass>(&alloc_stats)); |
| 92 | |
| 93 | alloc_stats.throw_after = 1; |
| 94 | try { |
| 95 | vec.push_front(instance); |
| 96 | assert(false); |
| 97 | } |
| 98 | catch (...) { |
| 99 | assert(vec==vec2); |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | return 0; |
| 104 | } |
| 105 |