libcsptr/include/csptr/vararg.h at 8b7ead6a9e10f4eb5174b6292b5fb3db65d9443a · Snaipe/libcsptr · GitHub

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/*
 * The MIT License (MIT)
 *
 * Copyright © 2015 Franklin "Snaipe" Mathieu <http://snai.pe/>
 *
 * 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.
 */

#ifndef CSPTR_CPP_VARARG_H_
# define CSPTR_CPP_VARARG_H_

#if __STRICT_ANSI__
# define ARG_LENGTH(...) __builtin_choose_expr(sizeof (#__VA_ARGS__) == 1,  \
        0,                                                                  \
        ARG_LENGTH__(__VA_ARGS__))
#else /* !__STRICT_ANSI__ */
# define ARG_LENGTH(...) ARG_LENGTH__(__VA_ARGS__)
#endif /* !__STRICT_ANSI__ */

# define ARG_LENGTH__(...) ARG_LENGTH_(,##__VA_ARGS__,                         \
    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)
# define ARG_LENGTH_(_, _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, Count, ...) Count

#endif /* !CSPTR_CPP_VARARG_H_ */