CX Framework
Cross-platform C utility framework
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optarg.h
Go to the documentation of this file.
1
6
7#pragma once
8
9#include "args.h"
10
29
30#if !defined(_MSC_VER)
31#define opt_arg(...) \
32 _opt_arg_dispatch_1(count_macro_args(dummy __VA_OPT__(, ) __VA_ARGS__), \
33 (dummy __VA_OPT__(, ) __VA_ARGS__))
34#define _opt_arg_dispatch_1(n, args) _opt_arg_dispatch_2(n, args)
35#define _opt_arg_dispatch_2(n, args) _opt_arg_##n args
36#define _opt_arg_1(f1) 0
37#define _opt_arg_2(f1, f2) f2
38
39// legacy compatibility
40#define opt_flags(...) \
41 _opt_arg_dispatch_1(count_macro_args(dummy __VA_OPT__(, ) __VA_ARGS__), \
42 (dummy __VA_OPT__(, ) __VA_ARGS__))
43#else
44// Hacky workaround for MSVC's broken preprocessor
45#define opt_arg(...) \
46 _opt_arg_expand(_opt_arg_dispatch(_opt_arg_catch_empty##__VA_ARGS__, __VA_ARGS__))
47#define _opt_arg_expand(x) x
48#define _opt_arg_catch_empty dummy1, _opt_arg_catch_paren
49#define _opt_arg_catch_paren(x) dummy3, dummy4
50#define _opt_arg_dispatch2(_1, _2, _3, _4, MACRO, ...) MACRO
51#define _opt_arg_dispatch(...) \
52 _opt_arg_expand(_opt_arg_dispatch2(__VA_ARGS__, \
53 _opt_arg_1a, \
54 _opt_arg_0, \
55 _opt_arg_1, \
56 ERROR)(__VA_ARGS__))
57#define _opt_arg_0(...) 0
58#define _opt_arg_1(dummy1, f1) f1
59#define _opt_arg_1a(dummy1, dummy2, dummy3, f1) f1
60
61// legacy compatibility
62#define opt_flags(...) \
63 _opt_arg_expand(_opt_arg_dispatch(_opt_arg_catch_empty##__VA_ARGS__, __VA_ARGS__))
64#endif
65
args.h
Macro argument counting utilities.