text: // SPDX-License-Identifier: MPL-2.0
  // Copyright (c) 2019, Yuxuan Shui <yshuiv7@gmail.com>
  
  #pragma once
  
  /// Macro metaprogramming
  
  #define _APPLY1(a, ...) a(__VA_ARGS__)
  #define _APPLY2(a, ...) a(__VA_ARGS__)
  #define _APPLY3(a, ...) a(__VA_ARGS__)
  #define _APPLY4(a, ...) a(__VA_ARGS__)
  
  #define RIOTA1(x) x
  #define RIOTA2(x) RIOTA1(x##1), RIOTA1(x##0)
  #define RIOTA4(x) RIOTA2(x##1), RIOTA2(x##0)
  #define RIOTA8(x) RIOTA4(x##1), RIOTA4(x##0)
  #define RIOTA16(x) RIOTA8(x##1), RIOTA8(x##0)
  /// Generate a list containing 31, 30, ..., 0, in binary
  #define RIOTA32(x) RIOTA16(x##1), RIOTA16(x##0)
  
  #define QUOTE(...) #__VA_ARGS__
  #define STRINGIFY(...) QUOTE(__VA_ARGS__)
  
  #define CONCAT2_INDIRECT(a, b) a##b
  #define CONCAT2(a, b) CONCAT2_INDIRECT(a, b)
  #define CONCAT(a, b) CONCAT2(a, b)
  
  #define CONCAT3_INDIRECT(a, b, c) a##b##c
  #define CONCAT3(a, b, c) CONCAT3_INDIRECT(a, b, c)
  
  #define CONCAT4_INDIRECT(a, b, c, d) a##b##c##d
  #define CONCAT4(a, b, c, d) CONCAT4_INDIRECT(a, b, c, d)
  
  #define _ARGS_HEAD(head, ...) head
  #define _ARGS_SKIP4(_1, _2, _3, _4, ...) __VA_ARGS__
  #define _ARGS_SKIP8(...) _APPLY1(_ARGS_SKIP4, _ARGS_SKIP4(__VA_ARGS__))
  #define _ARGS_SKIP16(...) _APPLY2(_ARGS_SKIP8, _ARGS_SKIP8(__VA_ARGS__))
  #define _ARGS_SKIP32(...) _APPLY3(_ARGS_SKIP16, _ARGS_SKIP16(__VA_ARGS__))
  
  /// Return the 33rd argument
  #define _ARG33(...) _APPLY4(_ARGS_HEAD, _ARGS_SKIP32(__VA_ARGS__))
  
  /// Return the number of arguments passed in binary, handles at most 31 elements
  #define VA_ARGS_LENGTH(...) _ARG33(0, ##__VA_ARGS__, RIOTA32(0))
  
  #define LIST_APPLY_000000(fn, sep, ...)
  #define LIST_APPLY_000001(fn, sep, x, ...) fn(x)
  #define LIST_APPLY_000010(fn, sep, x, ...) fn(x) sep() LIST_APPLY_000001(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_000011(fn, sep, x, ...) fn(x) sep() LIST_APPLY_000010(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_000100(fn, sep, x, ...) fn(x) sep() LIST_APPLY_000011(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_000101(fn, sep, x, ...) fn(x) sep() LIST_APPLY_000100(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_000110(fn, sep, x, ...) fn(x) sep() LIST_APPLY_000101(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_000111(fn, sep, x, ...) fn(x) sep() LIST_APPLY_000110(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_001000(fn, sep, x, ...) fn(x) sep() LIST_APPLY_000111(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_001001(fn, sep, x, ...) fn(x) sep() LIST_APPLY_001000(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_001010(fn, sep, x, ...) fn(x) sep() LIST_APPLY_001001(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_001011(fn, sep, x, ...) fn(x) sep() LIST_APPLY_001010(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_001100(fn, sep, x, ...) fn(x) sep() LIST_APPLY_001011(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_001101(fn, sep, x, ...) fn(x) sep() LIST_APPLY_001100(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_001110(fn, sep, x, ...) fn(x) sep() LIST_APPLY_001101(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_001111(fn, sep, x, ...) fn(x) sep() LIST_APPLY_001110(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_010000(fn, sep, x, ...) fn(x) sep() LIST_APPLY_001111(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_010001(fn, sep, x, ...) fn(x) sep() LIST_APPLY_010000(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_010010(fn, sep, x, ...) fn(x) sep() LIST_APPLY_010001(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_010011(fn, sep, x, ...) fn(x) sep() LIST_APPLY_010010(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_010100(fn, sep, x, ...) fn(x) sep() LIST_APPLY_010011(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_010101(fn, sep, x, ...) fn(x) sep() LIST_APPLY_010100(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_010110(fn, sep, x, ...) fn(x) sep() LIST_APPLY_010101(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_010111(fn, sep, x, ...) fn(x) sep() LIST_APPLY_010110(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_011000(fn, sep, x, ...) fn(x) sep() LIST_APPLY_010111(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_011001(fn, sep, x, ...) fn(x) sep() LIST_APPLY_011000(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_011010(fn, sep, x, ...) fn(x) sep() LIST_APPLY_011001(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_011011(fn, sep, x, ...) fn(x) sep() LIST_APPLY_011010(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_011100(fn, sep, x, ...) fn(x) sep() LIST_APPLY_011011(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_011101(fn, sep, x, ...) fn(x) sep() LIST_APPLY_011100(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_011110(fn, sep, x, ...) fn(x) sep() LIST_APPLY_011101(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_011111(fn, sep, x, ...) fn(x) sep() LIST_APPLY_011110(fn, sep, __VA_ARGS__)
  #define LIST_APPLY_(N, fn, sep, ...) CONCAT(LIST_APPLY_, N)(fn, sep, __VA_ARGS__)
  #define LIST_APPLY(fn, sep, ...)                                                         \
  	LIST_APPLY_(VA_ARGS_LENGTH(__VA_ARGS__), fn, sep, __VA_ARGS__)
  
  #define SEP_COMMA() ,
  #define SEP_COLON() ;
  #define SEP_NONE()
  