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
equal(const CMyClass & rhs) const27 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
CMyClass(int tag)42 CMyClass::CMyClass(int tag) :
43 fMagicValue(kStartedConstructionMagicValue), fTag(tag)
44 {
45 // Signal that the constructor has finished running
46 fMagicValue = kFinishedConstructionMagicValue;
47 }
48
CMyClass(const CMyClass & iOther)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
~CMyClass()60 CMyClass::~CMyClass() {
61 // Only instances for which the constructor has finished running should be destructed
62 assert(fMagicValue == kFinishedConstructionMagicValue);
63 }
64
operator ==(const CMyClass & lhs,const CMyClass & rhs)65 bool operator==(const CMyClass &lhs, const CMyClass &rhs) { return lhs.equal(rhs); }
66
main(int,char **)67 int main(int, char**)
68 {
69 CMyClass instance(42);
70 {
71 std::deque<CMyClass> vec;
72
73 vec.push_front(instance);
74 std::deque<CMyClass> vec2(vec);
75
76 gCopyConstructorShouldThrow = true;
77 try {
78 vec.push_front(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