src/third_party/libc++/trunk/test/containers/sequences/vector/vector.modifiers/push_back_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 // <vector>
  11
  12 // void push_back(const value_type& x);
  13
  14 #include <vector>
  15 #include <cassert>
  16
  17 // Flag that makes the copy constructor for CMyClass throw an exception
  18 static bool gCopyConstructorShouldThow = false;
  19
  20
  21 class CMyClass {
  22     public: CMyClass();
  23     public: CMyClass(const CMyClass& iOther);
  24     public: ~CMyClass();
  25
  26     private: int fMagicValue;
  27
  28     private: static int kStartedConstructionMagicValue;
  29     private: static int kFinishedConstructionMagicValue;
  30 };
  31
  32 // Value for fMagicValue when the constructor has started running, but not yet finished
  33 int CMyClass::kStartedConstructionMagicValue = 0;
  34 // Value for fMagicValue when the constructor has finished running
  35 int CMyClass::kFinishedConstructionMagicValue = 12345;
  36
  37 CMyClass::CMyClass() :
  38     fMagicValue(kStartedConstructionMagicValue)
  39 {
  40     // Signal that the constructor has finished running
  41     fMagicValue = kFinishedConstructionMagicValue;
  42 }
  43
  44 CMyClass::CMyClass(const CMyClass& /*iOther*/) :
  45     fMagicValue(kStartedConstructionMagicValue)
  46 {
  47     // If requested, throw an exception _before_ setting fMagicValue to kFinishedConstructionMagicValue
  48     if (gCopyConstructorShouldThow) {
  49         throw std::exception();
  50     }
  51     // Signal that the constructor has finished running
  52     fMagicValue = kFinishedConstructionMagicValue;
  53 }
  54
  55 CMyClass::~CMyClass() {
  56     // Only instances for which the constructor has finished running should be destructed
  57     assert(fMagicValue == kFinishedConstructionMagicValue);
  58 }
  59
  60 int main()
  61 {
  62     CMyClass instance;
  63     std::vector<CMyClass> vec;
  64
  65     vec.push_back(instance);
  66
  67     gCopyConstructorShouldThow = true;
  68     try {
  69         vec.push_back(instance);
  70     }
  71     catch (...) {
  72     }
  73 }