Hi, Is it possible to add default arguments before variable argument in variadic macro? e.g I have the version of macro something like #define MACRO(arg1, ...) func(arg1, ##__VA_ARGS__) I would like to add 2 more default arguments in the macro before variable arguments so that it should not affect previous version. Like: #define MAC...
i have to do something like this in C but it works only if I use a char but I need a string how can I do? #define USER "jack" // jack or queen #if USER == "jack" #define USER_VS "queen" #elif USER == "queen" #define USER_VS "jack" #endif thanks to all! ...
I'm not sure if this is possible, but I would like to create a shared object file and I would like to make it easy to use by having a #define that can be used to dereference the function names. In libfoo.h #define FOO_SO_FUNCTION_A aFunction In libfoo.so #include "libfoo/libfoo.h" extern "C" int FOO_SO_FUNCTION_A( void ) { ....
I would like to do conditional compilation in a program of mine. I know that if you declare a public static final boolean the compiler will ignore the branch that is not traversed. Is it possible to have an ant target change a variable before building the program? For example if I have: final public static boolean windows = false; ...
Is it possible to document preprocessor defines in Doxygen? I expected to be able to do it just like a variable or function, however the Doxygen output appears to have "lost" the documentation for the define, and does not contain the define its self either. I tried the following /**My Preprocessor Macro.*/ #define TEST_DEFINE(x) (x*x) ...
I've got a large Fortran codebase that originally targeted Intel's compiler. I'm now gearing up to compile with gfortran. Unfortunately, the code is littered with Intel-style pre-processing directives like: !DEC$ IF DEFINED (MYDIRECTIVE) REAL, DIMENSION(:,:,:), ALLOCATABLE :: my_real_var !DEC$ ENDIF From what I can tell via googlin...
Hello all, I'm looking for a method or a way to generate a list of typedefs and a list of object instantiations from a list of macro-invocations, defining the class types and the constructor parameters of these objects. It should look like the (not working) code below. The problem to solve is a way to generate to different lists out of...
I have a bunch of generated functions from a supplier's tool are required to be defined by me. Since the inner functionality of each and every one of these functions are exactly the same, I figured I could use a macro to make my life easier. Here is the offending warning: pasting "<function_name>" and "(" does not give a valid preproce...
I have several obj-c classes, each of which require a number of contants that are used in switch statements. I had tried defining these numerical constants in the .m file using the #define preprocessor instruction. All these constants begin with 'kCell'. This seems to work well but Xcode's code sense is presenting me with every 'kCell' ...
GLSL has a full C-style preprocessor. The only thing that does not work is #include. One of the great features is that that you can used #ifdef to comment out functions and thus create one shader that can be thinned out if certain features are not used. My Question is: Is there a way to define a macro from C code? There seems no way...
I'm trying to reduce the number of instructions and constant memory reads for a CUDA kernel. As a result, I have realised that I can pull out the tile sizes from constant memory and turn them into macros. How do I define macros that evaluate to constants during preprocessing so that I can simply adjust three values and reduce the number...
I want to comment a line using the pre-processor: #define open /##* #define close */ main() { open commented line close } when I do $gcc -E filename.c I expected /* commented line */ but I got / * commented line */ so that the compiler shows an error Why it is giving an unwanted space ? ...
My application does not fit into the "general purpose" RDBMS schema category, I do not want a ginormous DDL script -- therefore I would need #include semantics and I will probably have different variants of the scripts therefore I would need #ifdef semantics. Is GNU m4 the way to go ? Or perhaps there are some macro cabilities in psql ...
Since LLVM/cLang is especially well designed. This seems like a great opportunity to augment the C/C++ macro/preprocessor system. Does anyone know of additional macro/preprocessor abilities added by Clang or side projects to make the macro system more powerful (like turing complete) Thakns! Note: I am asking about macros. Not C++ ...
The following code works fine #define open { #define close } #include<stdio.h> #define int char main() open int a ; printf("This is testing code" ); close But If I exchange the lines #define<stdio.h> #define int char as #define int char #define<stdio.h> it throws lot of errors like this In file included from /usr/in...
Is there a way to make the GNU C Preprocessor, cpp (or some other tool) list all available macros and their values at a given point in a C file? I'm looking for system-specific macros while porting a program that's already unix savvy and loading a sparse bunch of unix system files. Just wondering if there's an easier way than going hun...
Can you write preprocessor directives to return you a std::string or char*? For example: In case of integers: #define square(x) (x*x) int main() { int x = square(5); } I'm looking to do the same but with strings like a switch-case pattern. if pass 1 it should return "One" and 2 for "Two" so on.. ...
Can you do something like this with a macro in C? #define SUPERMACRO(X,Y) #define X Y then SUPERMACRO(A,B) expands to #define A B I have a feeling not because the preprocessor only does one pass. EDIT Official gcc only. No third-party tools please. ...
Hi, that may be really simple but i'm unable to find a good answer. How can I make a macro representing first a certain value and then a different one ? I know that's nasty but i need it to implicitly declare a variable the first time and then do nothing. This variable is required by other macros that i'm implementing. Should i levera...
I would like to know why the Visual C++ compiler gets me an warning/error if I use the following code: #pragma message( "You have " _MSC_FULL_VER ) Here is what I get: error C2220: warning treated as error - no 'object' file generated warning C4081: expected ':'; found ')' The problem reproduces for _MSC_FULL_VER or _MSV_VER but no...