Question

Please pardon me if I am asking an obvious question,
but after going through a bunch of threads and trying out stuff, I am not able to pin down this simple thing.

I have this small program:

#define FUNC_PREFIX __FUNCTION__ "() :"

int main()
{
    printf("%s\n", FUNC_PREFIX);
    return 0;
}

So I can pass FUNC_PREFIX instead of __FUNCTION__ to log functions and they will print the calling function name followed by paren and colon — just so to improve readability of log line outputs.

This compiles fine as-is in Visual Studio 2008.
But in g++, I get an error expected ‘)’ before string constant

I tried a few things like doing:

#define TEMP __FUNCTION__ 
#define FUNC_PREFIX TEMP "() :" 

but to no avail.

What is the way to go about doing this?

Answer 1

Your printf is missing a quote. Use identifier __func__ and you can print two strings if you define the macro as:

#define FUNC_PREFIX __func__,"() :"

int main()
{
    printf("%s %s\n", FUNC_PREFIX);
    return 0;
}