How to make a variadic macro (variable number of arguments)

c g++ c-preprocessor variadic
hasen picture hasen · Mar 25, 2009 · Viewed 191.6k times · Source

I want to write a macro in C that accepts any number of parameters, not a specific number

example:

#define macro( X )  something_complicated( whatever( X ) )

where X is any number of parameters

I need this because whatever is overloaded and can be called with 2 or 4 parameters.

I tried defining the macro twice, but the second definition overwrote the first one!

The compiler I'm working with is g++ (more specifically, mingw)

Answer

Alex B picture Alex B · Mar 25, 2009

C99 way, also supported by VC++ compiler.

#define FOO(fmt, ...) printf(fmt, ##__VA_ARGS__)

Related questions

gcc/g++: "No such file or directory"

g++ gives me errors of the form: foo.cc:<line>:<column>: fatal error: <bar>: No such file or directory compilation terminated. It is the same when compiling C-programs with gcc. Why is that? Please …

Read More
What is the purpose of using -pedantic in GCC/G++ compiler?

This note says: -ansi: tells the compiler to implement the ANSI language option. This turns off certain "features" of GCC which are incompatible with the ANSI standard. -pedantic: used in conjunction with -ansi, this tells the compiler to be adhere …

Read More
g++ linker: force static linking if static library exists?

I've a program which links to many libraries. g++, by default, prefers to link to shared libraries, even if the corresponding archive exists. How can I change this preference to prefer static archives over dynamic libraries, if a static archive …

Read More