test/std/containers/sequences/list/list.modifiers/push_front_exception_safety.pass.cpp

   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
  19 static bool gCopyConstructorShouldThow = false;
  20
  21
  22 class 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
  34 int CMyClass::kStartedConstructionMagicValue = 0;
  35 // Value for fMagicValue when the constructor has finished running
  36 int CMyClass::kFinishedConstructionMagicValue = 12345;
  37
  38 CMyClass::CMyClass() :
  39     fMagicValue(kStartedConstructionMagicValue)
  40 {
  41     // Signal that the constructor has finished running
  42     fMagicValue = kFinishedConstructionMagicValue;
  43 }
  44
  45 CMyClass::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
  56 CMyClass::~CMyClass() {
  57     // Only instances for which the constructor has finished running should be destructed
  58     assert(fMagicValue == kFinishedConstructionMagicValue);
  59 }
  60
  61 int 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 }