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  1.  
  2.  
  3. #include <iostream>
  4. using namespace std;
  5.  
  6.  
  7. template<class T>
  8. void start_block(const char* str, T f)
  9. {
  10. 	cout<<"start: "<<str<<endl;
  11. 	f();
  12. 	cout<<"end: "<<str<<endl;
  13. }
  14. #define BLOCK(x)	start_block(x,[&]
  15.  
  16. int main()
  17. {
  18.  
  19. 	BLOCK("Program started")
  20. 	{
  21. 		if (1) 	BLOCK("if (1)")
  22. 		{
  23. 				cout << "Starting loop now\n";
  24.  
  25. 				for (int i = 0; i < 3; i++)	BLOCK("Iteration")
  26. 				{
  27. 						cout << "Executing iteration " << i << "\n";
  28. 				});
  29.  
  30. 				cout <<"Condition execution complete\n";
  31. 		});
  32. 	});
  33.  
  34. 	return 0;
  35. }
  36.  
  37.  
Success #stdin #stdout 0s 3456KB
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stdin
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Standard input is empty
stdout
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start: Program started
start: if (1)
Starting loop now
start: Iteration
Executing iteration 0
end: Iteration
start: Iteration
Executing iteration 1
end: Iteration
start: Iteration
Executing iteration 2
end: Iteration
Condition execution complete
end: if (1)
end: Program started
https://ideone.com/MDu43o
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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