C preprocessor Literal Construction

Question

My problem is as follows:

I have a string literal that is macro-ed like so

#define TITLE \"Title\"

But there are instances when I n

Answer 1

Try this:

#define WIDEN_(exp)   L##exp
#define WIDEN(exp)    WIDEN_(exp)
#define TITLE         "Title"
#define W_TITLE       WIDEN(TITLE)

You need to force an expansion through an intermediate macro to get what you're looking for.

#include <stdio.h>

#define WIDEN_(exp)   L##exp
#define WIDEN(exp)    WIDEN_(exp)
#define TITLE         "Title"
#define W_TITLE       WIDEN(TITLE)

int main(int argc, char *argv[])
{
    printf("%s\n", TITLE);
    wprintf(L"%ls\n", W_TITLE);
    return 0;
}

Result:

Title
Title