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  1. # include <iostream>
  2. using namespace std;
  3.  
  4. #define VA_NUM_ARGS(...) VA_NUM_ARGS_IMPL(0,__VA_ARGS__, 5,4,3,2,1)
  5. #define VA_NUM_ARGS_IMPL(_0,_1,_2,_3,_4,_5,N,...) N
  6.  
  7. #define macro_dispatcher(macro, ...) macro_dispatcher_(macro, VA_NUM_ARGS(__VA_ARGS__))
  8. #define macro_dispatcher_(macro, nargs) macro_dispatcher__(macro, nargs)
  9. #define macro_dispatcher__(macro, nargs) macro ## nargs
  10.  
  11. #define DBN(...) macro_dispatcher(DBN, __VA_ARGS__)(__VA_ARGS__)
  12.  
  13. #define DBN1(a)			cerr<<#a<<"="<<(a)<<"\n"
  14. #define DBN2(a,b)		cerr<<#a<<"="<<(a)<<"  "<<#b<<"="<<(b)<<"\n"
  15. #define DBN3(a,b,c)		cerr<<#a<<"="<<(a)<<"  "<<#b<<"="<<(b)<<"  "<<#c<<"="<<(c)<<"\n"
  16. #define DBN4(a,b,c,d)	cerr<<#a<<"="<<(a)<<"  "<<#b<<"="<<(b)<<"  "<<#c<<"="<<(c)<<"  "<<#d<<"="<<(d)<<"\n"
  17. // ...
  18.  
  19.  
  20. int main()
  21. {
  22. 	int x = 5, y = 10;
  23.  
  24. 	DBN(x, y, x*y+2);
  25.  	DBN(x+1, y/x);
  26.  
  27. 	return 0;
  28. }
  29.  
  30.  
Success #stdin #stdout #stderr 0s 3336KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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x=5  y=10  x*y+2=52
x+1=6  y/x=2
https://ideone.com/8PwAyg
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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