PP_FOREACH

Foreach loop for C Preprocessor

Usage

git submodule add https://github.com/hilbix/pp-foreach.git
ln --relative -s pp-foreach/*.h .

then

#include "pp_foreach.h"

EXAMPLE

Look into example.c to see a simple working example:

make example
./example neg sub neg 1 add neg 3 mul 4 sub 5 neg 6

From pp_foreach.h:

#include "pp_foreach.h"
PP_FOREACH(a,"hello","world","!")

gives

a("hello") a("world") a("!")

and

#include "pp_foreach.h"
PP_APPLY((hello,world,!),a,b)x

gives

a(hello) a(world) a(!) b(hello) b(world) b(!)x

From pp_repeat.h:

#include "pp_repeat.h"
PP_REPEAT(3,"hello world"))

gives

"hello world" (0)"hello world" (1)"hello world" (2)

and

#include "pp_repeat.h"
PP_REDUCE(PP_HAVE2ARGS,PP_SUM,1,2,3)

with the given

#define PP_SUM(x,y,...)	x+y,##__VA_ARGS__

gives

1+2+3

Note that it would also work with something like

#define PP_SUM(x,y,...)	x+y,__VA_ARGS__

FAQ

WTF why?

• Because I always wanted it since the 1980s!

License?

• This Works is placed under the terms of the Copyright Less License,
  see file COPYRIGHT.CLL. USE AT OWN RISK, ABSOLUTELY NO WARRANTY.
• Read: Free as free beer, free speech and free baby.

Drawbacks?

• If the compiler generates a warning within the macro expansion this takes ages.
  • Apparently the output of arround 100000 lines of macro traceback for each warning is a bit slow ..