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  1. #define RESOURCEHOLDER(DEFINITIONS, ENTRYCODE, EXITCODE, OBJECTNAME)\
  2.     struct RESOURCEHOLDER_##OBJECTNAME{\
  3.     	DEFINITIONS\
  4. 		RESOURCEHOLDER_##OBJECTNAME(){\
  5. 			ENTRYCODE\
  6. 		}\
  7. 		~RESOURCEHOLDER_##OBJECTNAME(){\
  8. 			EXITCODE\
  9. 		}\
  10. 	}OBJECTNAME
  11.  
  12. //Anwendungsbeispiel
  13. #include <iostream>
  14. #include <string>
  15. using std::cout;
  16. using std::string;
  17. int main(){
  18. 	//2 Resourcen im selben scope:
  19. 	RESOURCEHOLDER(int i;, i = 5; cout << "RESOURCEHOLDER initialized\n";, cout << "RESOURCEHOLDER destroyed " << i << '\n';, rh);
  20. 	cout << rh.i << '\n';
  21. 	rh.i += 2;
  22. 	RESOURCEHOLDER(double j;, j = 12.; cout << "RESOURCEHOLDER initialized\n";, cout << "RESOURCEHOLDER destroyed " << j << '\n';, rh2);
  23. 	cout << rh2.j << '\n';
  24. 	rh2.j += 3;
  25. 	{
  26. 		//ich könnte schwören struct RESOURCEHOLDER_rh ist doppelt definiert, aber weder VS2010E noch gcc 4.3.4 stören sich dran
  27. 		RESOURCEHOLDER(string s;, s = "Hello world"; cout << "RESOURCEHOLDER initialized\n";, cout << "RESOURCEHOLDER destroyed " << s << '\n';, rh);
  28. 		cout << rh.s << '\n';
  29. 		rh.s += "!!!";
  30. 	}
  31. }
  32.  
Success #stdin #stdout 0.01s 2856KB
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stdin
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Standard input is empty
stdout
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RESOURCEHOLDER initialized
5
RESOURCEHOLDER initialized
12
RESOURCEHOLDER initialized
Hello world
RESOURCEHOLDER destroyed Hello world!!!
RESOURCEHOLDER destroyed 15
RESOURCEHOLDER destroyed 7
https://ideone.com/BHUddF
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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