taisei/src/util/macrohax.h
2024-05-17 04:58:47 +02:00

61 lines
2 KiB
C

/*
* This software is licensed under the terms of the MIT License.
* See COPYING for further information.
* ---
* Copyright (c) 2011-2024, Lukas Weber <laochailan@web.de>.
* Copyright (c) 2012-2024, Andrei Alexeyev <akari@taisei-project.org>.
*/
#pragma once
#include "taisei.h"
#define MACROHAX_FIRST_(f, ...) f
#define MACROHAX_FIRST(...) MACROHAX_FIRST_(__VA_ARGS__, _)
#define MACROHAX_EMPTY()
#define MACROHAX_DEFER(id) id MACROHAX_EMPTY()
#define MACROHAX_OBSTRUCT(...) __VA_ARGS__ MACROHAX_DEFER(MACROHAX_EMPTY)()
#define MACROHAX_EXPAND(...) __VA_ARGS__
#define MACROHAX_CONCAT_(a, b) a ## b
#define MACROHAX_CONCAT(a, b) MACROHAX_CONCAT_(a, b)
#define MACROHAX_ADDLINENUM(a) MACROHAX_CONCAT(a, __LINE__)
#define MACROHAX_STRINGIFY(x) #x
// Expands to 0 if argument list is empty, 1 otherwise.
// Up to 32 arguments supported.
#define MACROHAX_HASARGS(...) \
MACROHAX_EXPAND(MACROHAX_DEFER(MACROHAX_ARGCOUNT_HELPER)(\
_, ##__VA_ARGS__, MACROHAX_HASARGS_RSEQ_N() \
))
// Expands to the number of its arguments.
// Up to 32 arguments supported.
#define MACROHAX_NARGS(...) \
MACROHAX_EXPAND(MACROHAX_DEFER(MACROHAX_ARGCOUNT_HELPER)(\
_, ##__VA_ARGS__, MACROHAX_NARGS_RSEQ_N() \
))
#define MACROHAX_HASARGS_RSEQ_N() \
1, 1, 1, 1, 1, 1, 1, 1, \
1, 1, 1, 1, 1, 1, 1, 1, \
1, 1, 1, 1, 1, 1, 1, 1, \
1, 1, 1, 1, 1, 1, 1, 1, 0,
#define MACROHAX_NARGS_RSEQ_N() \
32, 31, 30, 29, 28, 27, 26, 25, \
24, 23, 22, 21, 20, 19, 18, 17, \
16, 15, 14, 13, 12, 11, 10, 9, \
8, 7, 6, 5, 4, 3, 2, 1, 0,
#define MACROHAX_ARGCOUNT_HELPER(_0, \
__1, __2, __3, __4, __5, __6, __7, __8, \
__9, _10, _11, _12, _13, _14, _15, _16, \
_17, _18, _19, _20, _21, _22, _23, _24, \
_25, _26, _27, _28, _29, _30, _31, _32, N, ...) N
// Expands to baseN, where N is the number of arguments.
#define MACROHAX_OVERLOAD_NARGS(base, ...) \
MACROHAX_CONCAT(base, MACROHAX_NARGS(__VA_ARGS__))
// Expands to baseN, where N is 0 if the argument list is empty, 1 otherwise.
#define MACROHAX_OVERLOAD_HASARGS(base, ...) \
MACROHAX_CONCAT(base, MACROHAX_HASARGS(__VA_ARGS__))