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  1. #include <iostream>
  2.  
  3. #define OUT(x) if((y = x > 0 ? x : y), x > 1) cout << x+1
  4.  
  5. using namespace std;
  6.  
  7. int main() {
  8. 	int y = 0;
  9. 	OUT(0) << "message";     // OK
  10.         cout << y << endl;
  11.  
  12. 	OUT(1) << "message";     // OK
  13.         cout << y << endl;
  14.  
  15. 	OUT(2) << "message";     // OK
  16.         cout << y << endl;
  17.  
  18. 	if(0) {
  19. 	   OUT(2) << "message";     // OK, nothing printed
  20. 	}
  21.  
  22.         cout << y << endl;
  23.  
  24. 	if(0)
  25. 	   OUT(3) << "message";     // Nothing printed as well
  26.  
  27.         cout << y << endl;        
  28.  
  29. 	return 0;
  30. }
Success #stdin #stdout 0.01s 2724KB
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stdin
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Standard input is empty
stdout
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0
1
3message2
2
2
https://ideone.com/EJv2v
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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