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  1. #include <iostream>
  2. #include <fstream>
  3. #include <string>
  4. #include <memory>
  5. using namespace std;
  6.  
  7.  
  8. class Logger
  9. {
  10. private:
  11.     static unique_ptr<Logger> loggerPtr;
  12.     std::fstream fs;
  13.  
  14.     //To ensure no one else can instantiate Logger.
  15.     Logger(); 
  16.  
  17. public:
  18.     enum MessageType
  19.     {
  20.         ERROR,
  21.         WARNING,
  22.         INFO
  23.     };
  24.  
  25.     static Logger* Instance();
  26.     void LogFunc(std::string msg, MessageType type);
  27.     ~Logger() { cout << "YES IT IS CLOSED !!"<<endl;  }
  28.  
  29. friend unique_ptr<Logger> make_unique<Logger>(); 
  30. };
  31.  
  32. unique_ptr<Logger> Logger::loggerPtr{};
  33.  
  34. Logger* Logger::Instance()
  35. {
  36.     if (!loggerPtr)
  37.     {
  38.         loggerPtr = make_unique<Logger>();
  39.     }
  40.  
  41.     return loggerPtr.get();
  42. }
  43.  
  44. Logger::Logger()
  45. {
  46.     fs.open("docker.log", std::fstream::in | std::fstream::out | std::fstream::app);
  47. }
  48.  
  49. void Logger::LogFunc(std::string msg, MessageType type)
  50. {
  51.     std::cout << msg;
  52.  
  53.     switch (type)
  54.     {
  55.         case ERROR:
  56.             fs << msg;
  57.             break;
  58.         case WARNING:
  59.             fs << msg;
  60.             break;
  61.         case INFO:
  62.             fs << msg;
  63.             break;
  64.     }
  65. }
  66.  
  67.  
  68.  
  69. int main() {
  70.     Logger::Instance()->LogFunc("Hello.", Logger::INFO);
  71.  
  72.     std::fstream fs;
  73.     fs.open("docker_test.log", std::fstream::in | std::fstream::out | std::fstream::app);
  74.     fs << "Why does this work?!";
  75.  
  76.     system("pwd");
  77.  
  78.     return 0;
  79. }
Success #stdin #stdout 0s 3416KB
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Standard input is empty
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/home/mjc1Kl
Hello.YES IT IS CLOSED !!
https://ideone.com/okrKuA
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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