SW+Variadic.h

//
//  SW+Variadic.h
//  Sophtwhere
//
//  Created by Jonathan Annett on 17/12/11.
//  Copyright (c) 2011 Sophtwhere. All rights reserved.
//

/*

 .  This header contains macros that are core to the
 .  Sophtwhere Objective C extension approach.
 .
 .  They are used for counting macro arguments and automatic selection of
 .  sub macros based on the number of arguments being used.
 .
 .  Original source: these macros were adapated from information gleaned from
 .  the following web posts, with the second url being the most likely candidate
 .  as the original author.

 http://stackoverflow.com/questions/5365440/variadic-macro-trick

 http://cplusplus.co.il/2010/07/17/variadic-macro-to-count-number-of-arguments/


 */

#define VA_NARGS_IMPL(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, N, ...) N
#define VA_NARGS(...) VA_NARGS_IMPL(X,##__VA_ARGS__, 11, 10,9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
#define VARARG_IMPL2(base, count, ...) base##count(__VA_ARGS__)
#define VARARG_IMPL(base, count, ...) VARARG_IMPL2(base, count, __VA_ARGS__)
#define VARARG(base, ...) VARARG_IMPL(base, VA_NARGS(__VA_ARGS__), __VA_ARGS__)



#define __variadicName(...) VARARG(__variadicName_, __VA_ARGS__)