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  1. #include <iostream>
  2. #include <memory>
  3.  
  4. struct LoggingConfig {};
  5.  
  6. template<typename Derived>
  7. class Logging {
  8. public:
  9.     explicit Logging(const LoggingConfig& config) {}
  10.  
  11.     static std::unique_ptr<Derived> CreateIfLoggingEnabled(const LoggingConfig& config) {
  12.         return std::make_unique<Derived>(config);
  13.     }
  14. };
  15.  
  16. class LoggingString : public Logging<LoggingString> {
  17. public:
  18.     using Logging<LoggingString>::Logging;
  19.  
  20.     void writeLog(std::string str) { std::cout << "[LoggingString] " << str << std::endl; }
  21. };
  22.  
  23. class LoggingInt : public Logging<LoggingInt> {
  24. public:
  25.     using Logging<LoggingInt>::Logging;
  26.  
  27.     void writeLog(int i) { std::cout << "[LoggingInt] " << i << std::endl; }
  28. };
  29.  
  30. int main()
  31. {
  32. 	auto logger1 = LoggingString::CreateIfLoggingEnabled(LoggingConfig{});
  33. 	logger1->writeLog("hello");
  34.  
  35. 	auto logger2 = LoggingInt::CreateIfLoggingEnabled(LoggingConfig{});
  36. 	logger2->writeLog(12345);
  37.  
  38. 	return 0;
  39. }
Success #stdin #stdout 0s 5520KB
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stdin
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Standard input is empty
stdout
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[LoggingString] hello
[LoggingInt] 12345
https://ideone.com/PNwA0x
language:
C++ 4.3.2 (gcc-4.3.2)
created:
4 years ago
visibility:
public

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