cmoball.h

/*
 * SPDX-License-Identifier: MIT
 * Copyright 2021,2024 Jorenar <dev@jorenar.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 */

/* Resources:
 *   https://gustedt.wordpress.com/2010/06/08/detect-empty-macro-arguments
 *   https://stackoverflow.com/a/30566098/10247460
 *   https://reddit.com/r/C_Programming/comments/mds9sm/deleted_by_user/gsbbkfk
 */

#ifndef CMOBALL_H_
#define CMOBALL_H_

#define CMOBALL(NAME, ...) CMOBALL_OVR(NAME, CMOBALL_NUM_ARGS(__VA_ARGS__))(__VA_ARGS__)

#define CMOBALL_OVR(name, num)   CMOBALL__OVR(name, num)
#define CMOBALL__OVR(name, num)  name ## _ ## num

/* *INDENT-OFF* */
#define CMOBALL_ARG_N( \
         _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, _33, _34, _35, _36, _37, _38, _39, \
        _40, _41, _42, _43, _44, _45, _46, _47, _48, _49, \
        _50, _51, _52, _53, _54, _55, _56, _57, _58, _59, \
        _60, _61, _62, _63, \
        N, ...)  N

#define CMOBALL_RSEQ_N \
                        64, 63, 62, 61, 60, \
    59, 58, 57, 56, 55, 54, 53, 52, 51, 50, \
    49, 48, 47, 46, 45, 44, 43, 42, 41, 40, \
    39, 38, 37, 36, 35, 34, 33, 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
/* *INDENT-ON* */

#define CMOBALL_DETECT_0_ARGS(...) CMOBALL__DETECT_0 ## __VA_ARGS__ ## _
#define CMOBALL__DETECT_0_ ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,0

#define CMOBALL__NUM_ARGS(ARGS) CMOBALL_ARG_N ARGS
#define CMOBALL_NUM_ARGS(...) CMOBALL__NUM_ARGS((CMOBALL_DETECT_0_ARGS(__VA_ARGS__), CMOBALL_RSEQ_N))

#endif /* CMOBALL_H_ */