How to convert #defined string literal to a wide string literal? [duplicate]

Question

Possible Duplicate:
How to convert concatenated strings to wide-char with the C preprocessor?

I have a string literal defined using a #define:

#define B "1234\0"

How do I use this definition to get this wide string literal at compile time?:

L"1234\0"

(just the #defined string literal with L prepended to make it into a wide string).

I tried this:

#define MAKEWIDE(s) L##s

but this generates LB.

Answer 1

Token pasting needs an additional level of indirection to deal properly with macros used as operands. Try something like:

#define PASTE(x, y) x##y
#define MAKEWIDE(x) PASTE(L,x)