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  1. 	#include <iostream>
  2. 	#include <fstream>
  3.  
  4. 	using namespace std;
  5.  
  6. 	class Logger {
  7. 	public:
  8. 	    Logger(ostream& os) : os_(os), curIndentLevel_(0) {}
  9. 	    Logger& increaseLevel() { ++curIndentLevel_; return *this; }
  10. 	    Logger& decreaseLevel() { --curIndentLevel_; return *this; }
  11.  
  12. 	private:
  13. 	    template<typename T> friend ostream& operator<<(Logger&, T);
  14.  
  15. 	    ostream& os_;
  16. 	    int curIndentLevel_;
  17. 	};
  18.  
  19. 	template<typename T> 
  20. 	ostream& operator<<(Logger& log, T op) {
  21. 		for(int i = 0; i < log.curIndentLevel_ * 4; ++i) {
  22. 			log.os_ << ' ';
  23. 		}
  24. 		log.os_ << op;
  25. 		return log.os_;
  26. 	}
  27.  
  28. 	int main() {
  29. 		Logger log(cout);
  30.  
  31. 		log.increaseLevel() << "Hello World!" << endl;
  32. 		log.decreaseLevel() << "Hello World!" << endl;
  33. 		return 0;
  34. 	}
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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    Hello World!
Hello World!
https://ideone.com/vcMDxL
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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