C: Expand Macro With Token Pasting

by

In C the operands of the token pasting operator ## are not expanded.

You need a second level of indirection to get the expansion.

#define CAT(x, y) CAT_(x, y)
#define CAT_(x, y) x ## y

More Related Contents:

  1. How to pass arguments in __VA_ARGS to a 2d character array? [closed]
  2. Passing values to macros by for loop
  3. The need for parentheses in macros in C [duplicate]
  4. Overloading Macro on Number of Arguments
  5. C macros and use of arguments in parentheses
  6. Real-world use of X-Macros
  7. What’s the use of do while(0) when we define a macro? [duplicate]
  8. C multi-line macro: do/while(0) vs scope block [duplicate]
  9. __FILE__ macro shows full path
  10. What exactly do C include guards do?
  11. Array-size macro that rejects pointers
  12. What is “:-!!” in C code?
  13. Implement generic swap macro in C [duplicate]
  14. What are C macros useful for?
  15. Is there a macro definition to check the Linux kernel version?
  16. How big can a malloc be in C?
  17. Macro to count number of arguments
  18. Opposite of C preprocessor “stringification”
  19. What are the implications of the linux __user macro?
  20. C Macros to create strings
  21. Macro and function with same name
  22. Macro expansion and stringification: How to get the macro name (not its value) stringified using another macro?
  23. Incompatible pointer types passing in _Generic macro
  24. How to pass macro definition from “make” command line arguments (-D) to C source code?
  25. Equivalents to MSVC’s _countof in other compilers?
  26. What makes a better constant in C, a macro or an enum?
  27. Inline function v. Macro in C — What’s the Overhead (Memory/Speed)?
  28. offsetof at compile time
  29. What is ‘:-!!’ in C?
  30. Macros to create strings in C

Leave a Comment