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  1. #include <iostream>
  2. #include <sstream>
  3.  
  4. using namespace std;
  5.  
  6. class ScopeGuard
  7. {
  8.     bool commited;
  9.     stringstream accumulator;
  10. public:
  11.     ScopeGuard() : commited(false) {}
  12.     void commit()
  13.     {
  14.         commited = true;
  15.     }
  16.     bool done() const
  17.     {
  18.         return commited;
  19.     }
  20.     template<typename Data>
  21.     ScopeGuard &operator<<(const Data &x)
  22.     {
  23.         accumulator << x;
  24.         return *this;
  25.     }
  26.     ~ScopeGuard()
  27.     {
  28.         if(commited)
  29.             cout << accumulator.str();
  30.     }
  31. };
  32.  
  33. #define LOG(anything) \
  34. for(ScopeGuard guard; !guard.done(); guard.commit()) \
  35.     guard \
  36. /**/
  37.  
  38.  
  39. int main()
  40. {
  41.     try
  42.     {
  43.         LOG(lg) << "Failure" << (false ? "\n" : throw 1);
  44.     }
  45.     catch(...) {}
  46.  
  47.     LOG(lg) << "Success" << (true ? "\n" : throw 1);
  48. }
Success #stdin #stdout 0s 3032KB
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Standard input is empty
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Success
https://ideone.com/ynQ2XX
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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