stringification

My guess is the answer to this question is no, but it would be awesome if there was a way. To clarify, assume I have the following macro: #define MY_VARIADIC_MACRO(X...) // Does some stuff here in the macro definition What I would like to do is somehow perform stringification on all the variables of X before passing it to a variadic function; the keyword here is before. I realize there's no way to really access the individual arguments from within the macro definition, but is there a way to stringify all the arguments, with maybe something like the following? #define MY_VARIADIC_MACRO(X...)

I am working on a project where I have many constant strings formed by concatenation (numbers, etc.). For example, I have a LOCATION macro that formats __FILE__ and __LINE__ into a string that I can use to know where I am in the code, when printing messages or errors: #define _STR(x) # x #define STR(x) _STR(x) #define LOCATION __FILE__ "(" STR(__LINE__) ")" So, this would format a location like "file.cpp(42)". The problem is when I try to convert the result to a wide-string: #define _WIDEN(x) L ## x #define WIDEN(x) _WIDEN(x) #define WLOCATION WIDEN(LOCATION) This works just fine with GCC, and

When using C preprocessor one can stringify macro argument like this: #define TO_STRING(x) "a string with " #x and so when used, the result is as follows: TO_STRING(test) will expand to: "a string with test" Is there any way to do the opposite? Get a string literal as an input argument and produce a C identifier? For example: TO_IDENTIFIER("some_identifier") would expand to: some_identifier Thank you for your answers. EDIT: For those wondering what do I need it for: I wanted to refer to nodes in a scene graph of my 3D engine by string identifiers but at the same time avoid comparing strings in

Alternative Titles (to aid search) Convert a preprocessor token to a string How to make a char string from a C macro's value? Original Question I would like to use C #define to build literal strings at compile time. The string are domains that change for debug, release etc. I would like to some some thing like this: #ifdef __TESTING #define IV_DOMAIN domain.org //in house testing #elif __LIVE_TESTING #define IV_DOMAIN test.domain.com //live testing servers #else #define IV_DOMAIN domain.com //production #endif // Sub-Domain #define IV_SECURE "secure.IV_DOMAIN" //secure.domain.org etc #define

I'm trying to figure out how I can concatenate a #define 'd int to a #define 'd string using the C Preprocessor. My compiler is GCC 4.1 on CentOS 5. The solution should also work for MinGW. I'd like to append a version number onto a string, but the only way I can get it to work is to make a copy of the version number defines as strings. The closest thing I could find was a method of quoting macro arguments, but it doesn't work for #define s This is does not work. #define MAJOR_VER 2 #define MINOR_VER 6 #define MY_FILE "/home/user/.myapp" #MAJOR_VER #MINOR_VER It doesn't work without the # s

I have a C program below: #define f(g,g2) g##g2 main() { int var12=100; printf("%d",f(var,12)); } when I run just the preprocessor it expands this as { int var12=100; printf("%d",var12); } which is the reason why the output is 100. Can anybody tell me how/why the preprocessor expands var##12 to var12 ? nothing too fancy: ## tells the preprocessor to concatenate the left and right sides see http://en.wikipedia.org/wiki/C_preprocessor#Token_concatenation because ## is a token concatenation operator for the c preprocessor. Or maybe I don't understand the question. ## is Token Pasting Operator The