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  1. /**
  2.  * Run logging and then make core dump with not flushed log messages.
  3. */
  4. #include <iostream>
  5. #include <string>
  6. #include <sstream>
  7. #include <cstdlib>
  8.  
  9. using namespace std;
  10.  
  11.  
  12. //! Пишем в буфер и флашим когда размер буфера > flushSize_
  13. class PseudoLogger {
  14.     private:
  15.         string buffer_;
  16.         const string cookie_;
  17.         size_t flushSize_ = 50u;
  18.  
  19.         PseudoLogger():cookie_("my cookie") {
  20.             resetBuffer();
  21.         }
  22.  
  23.         void resetBuffer() {
  24.             buffer_ = cookie_;
  25.         }
  26.  
  27.         void flush() {
  28.             cout << buffer_.substr(cookie_.size());
  29.             resetBuffer();
  30.         }
  31.     public:
  32.         ~PseudoLogger() {
  33.             flush();
  34.         }
  35.  
  36.         static PseudoLogger& getInstance() {
  37.             static PseudoLogger logger;
  38.             return logger;
  39.         }
  40.  
  41.         void Log(string message) {
  42.             if (message.size() > flushSize_)
  43.                 message.resize(flushSize_);
  44.  
  45.             buffer_ += message;
  46.             buffer_ += string("\n");
  47.  
  48.             if (buffer_.size() > flushSize_)
  49.                 flush();
  50.         }
  51. };
  52.  
  53.  
  54. int main(int argc, char** argv) {
  55.     PseudoLogger& logger = PseudoLogger::getInstance();
  56.  
  57.     for (int i=1; i<20; ++i) {
  58.         std::stringstream out;
  59.         out << i;
  60.         logger.Log(string("test message ") + out.str());
  61.     }
  62.  
  63.     abort();
  64.  
  65.     return 0;
  66. }
  67.  
Not running #stdin #stdout 0s 0KB
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https://ideone.com/ZQ6YWj
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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