push_front_exception_safety.pass.cpp revision efc9f170c9fa0b988fac6d7df8b6e177252e1a1b 
1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// UNSUPPORTED: libcpp-no-exceptions
11// <list>
12
13// void push_front(const value_type& x);
14
15#include <list>
16#include <cassert>
17
18// Flag that makes the copy constructor for CMyClass throw an exception
19static bool gCopyConstructorShouldThow = false;
20
21
22class CMyClass {
23    public: CMyClass();
24    public: CMyClass(const CMyClass& iOther);
25    public: ~CMyClass();
26
27    private: int fMagicValue;
28
29    private: static int kStartedConstructionMagicValue;
30    private: static int kFinishedConstructionMagicValue;
31};
32
33// Value for fMagicValue when the constructor has started running, but not yet finished
34int CMyClass::kStartedConstructionMagicValue = 0;
35// Value for fMagicValue when the constructor has finished running
36int CMyClass::kFinishedConstructionMagicValue = 12345;
37
38CMyClass::CMyClass() :
39    fMagicValue(kStartedConstructionMagicValue)
40{
41    // Signal that the constructor has finished running
42    fMagicValue = kFinishedConstructionMagicValue;
43}
44
45CMyClass::CMyClass(const CMyClass& /*iOther*/) :
46    fMagicValue(kStartedConstructionMagicValue)
47{
48    // If requested, throw an exception _before_ setting fMagicValue to kFinishedConstructionMagicValue
49    if (gCopyConstructorShouldThow) {
50        throw std::exception();
51    }
52    // Signal that the constructor has finished running
53    fMagicValue = kFinishedConstructionMagicValue;
54}
55
56CMyClass::~CMyClass() {
57    // Only instances for which the constructor has finished running should be destructed
58    assert(fMagicValue == kFinishedConstructionMagicValue);
59}
60
61int main()
62{
63    CMyClass instance;
64    std::list<CMyClass> vec;
65
66    vec.push_front(instance);
67
68    gCopyConstructorShouldThow = true;
69    try {
70        vec.push_front(instance);
71    }
72    catch (...) {
73    }
74}
75