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  1. #include <string>
  2. #include <stdexcept>
  3. #include <iostream>
  4. using namespace std;
  5.  
  6. class throwsecond
  7. {
  8.     static int count;
  9. public:
  10.     throwsecond(const string &)
  11.     {
  12.         if (count ++)
  13.         {
  14.             count = 0;
  15.             throw runtime_error("Kaboom!");
  16.         }
  17.         cout << "Constructed\n";
  18.     }
  19.     ~throwsecond()
  20.     {
  21.         cout << "Destructed\n";
  22.     }
  23. };
  24.  
  25. int throwsecond::count = 0;
  26.  
  27. class bad_example
  28. {
  29.     throwsecond * a;
  30.     throwsecond * b;
  31. public:
  32.     bad_example(): a(nullptr), b(nullptr)
  33.     {
  34.     }
  35.     bad_example (const string& a,
  36.                  const string& b)
  37.     {
  38.         this->a = new throwsecond(a);
  39.         this->b = new throwsecond(b);
  40.     }
  41.     ~bad_example()
  42.     {
  43.         delete a;
  44.         delete b;
  45.     }
  46. };
  47.  
  48. class good_example
  49. {
  50.     throwsecond * a;
  51.     throwsecond * b;
  52. public:
  53.     good_example(): a(nullptr), b(nullptr)
  54.     {
  55.     }
  56.     good_example (const string& a,
  57.                   const string& b) : good_example{}
  58.     {
  59.         this->a = new throwsecond(a);
  60.         this->b = new throwsecond(b);
  61.     }
  62.     ~good_example()
  63.     {
  64.         delete a;
  65.         delete b;
  66.     }
  67. };
  68.  
  69. int main()
  70. {
  71.     cout << "Bad example\n";
  72.     try
  73.     {
  74.         bad_example("", "");
  75.     }
  76.     catch (...)
  77.     {
  78.         cout << "Caught exception\n";
  79.     }
  80.     cout << "Good example\n";
  81.     try
  82.     {
  83.         good_example("", "");
  84.     }
  85.     catch (...)
  86.     {
  87.         cout << "Caught exception\n";
  88.     }
  89. }
  90.  
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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Bad example
Constructed
Caught exception
Good example
Constructed
Destructed
Caught exception
https://ideone.com/0ckSge
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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