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  1. #include <iostream>
  2.  
  3. #define CAT(tt) CALLP (CAT_B ## tt CATE)
  4. #define CALLP(a) a
  5. #define CAT_B0 CATSN CATB 0,
  6. #define CAT_B1 CATSN CATB 1,
  7. #define CATS(a,b) a##b
  8. #define CATE )
  9. #define CATB (
  10. #define CATSN CATS
  11. #define T_(a) T__(a)
  12. #define T__(a) #a
  13.  
  14.  
  15. int main() {
  16.   std::cout << (CAT ( 0 1 )) << std::endl;
  17.   std::cout << (CAT ( 1 101 )) << std::endl;
  18. }
  19.  
Success #stdin #stdout 0s 2884KB
comments (?)
stdin 
Standard input is empty
stdout 
1
1101
https://ideone.com/EKlTGt
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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