32 lines
1.6 KiB
C++
32 lines
1.6 KiB
C++
// Copyright Louis Dionne 2017
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#ifndef DYNO_DETAIL_PREPROCESSOR_HPP
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#define DYNO_DETAIL_PREPROCESSOR_HPP
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// Macro expanding to the number of arguments it is passed.
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//
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// Specifically, `DYNO_PP_NARG(x1, ..., xn)` expands to `n`.
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// The program is ill-formed if `n > 64` or if `n == 0`.
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#define DYNO_PP_NARG(...) \
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DYNO_PP_NARG_IMPL(__VA_ARGS__, 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,)
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#define DYNO_PP_NARG_IMPL(e0, e1, e2, e3, e4, e5, e6, e7, e8, e9, e10, e11, e12, e13, e14, e15, e16, e17, e18, e19, e20, e21, e22, e23, e24, e25, e26, e27, e28, e29, e30, e31, e32, e33, e34, e35, e36, e37, e38, e39, e40, e41, e42, e43, e44, e45, e46, e47, e48, e49, e50, e51, e52, e53, e54, e55, e56, e57, e58, e59, e60, e61, e62, e63, N, ...) N
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// Expands to the concatenation of its two arguments.
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#define DYNO_PP_CONCAT(x, y) DYNO_PP_CONCAT_PRIMITIVE(x, y)
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#define DYNO_PP_CONCAT_PRIMITIVE(x, y) x ## y
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// Expands to the stringized version of its argument.
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#define DYNO_PP_STRINGIZE(...) DYNO_PP_STRINGIZE_PRIMITIVE(__VA_ARGS__)
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#define DYNO_PP_STRINGIZE_PRIMITIVE(...) #__VA_ARGS__
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// Expands to its first argument.
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#define DYNO_PP_VARIADIC_HEAD(head, ...) head
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// Expands to all the arguments beyond the first one.
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#define DYNO_PP_VARIADIC_TAIL(head, ...) __VA_ARGS__
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#endif // DYNO_DETAIL_PREPROCESSOR_HPP
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