Arbutils/src/MacroUtilsGenerator.py

def generator(num):
    file = open("MacroUtils.hpp", "w")

    file.write("//\n//\n// THIS FILE IS AUTOGENERATED, DO NOT EDIT!\n//\n//\n")

    file.write("// Defines a for each macro utility, with up to " + str(num) + " elements.\n")
    file.write("#define  ___MACRO_UTILS_FE_0(FUNC, arg)\n")
    file.write("#define  ___MACRO_UTILS_FE_1(FUNC, arg, X) FUNC(X, arg)\n")
    for i in range(2, num + 1):
        file.write("#define  ___MACRO_UTILS_FE_" + str(i) + "(FUNC, arg, X, ...) FUNC(X, arg)  ___MACRO_UTILS_FE_" +
                   str(i - 1) + "(FUNC, arg, __VA_ARGS__)\n")
    file.write("#define  ___MACRO_UTILS_FE_" + str(num + 1) +"(FUNC, arg, X, ...) THE_FOREACH_MACRO_CURRENTLY_ONLY_SUPPORTS_UP_TO_" +
               str(num) + "_VALUES  ___MACRO_UTILS_FE_" + str(num) + "(FUNC, arg, __VA_ARGS__)\n")
    file.write("#define  ___MACRO_UTILS_FE_VAL_0(FUNC, arg)\n")
    file.write("#define  ___MACRO_UTILS_FE_VAL_1(FUNC, arg, X) FUNC(X, arg)\n")
    for i in range(2, num + 1):
        file.write("#define  ___MACRO_UTILS_FE_VAL_" + str(i) + "(FUNC, arg, X, ...) FUNC(X, arg -" + str(i - 1) + ")  ___MACRO_UTILS_FE_VAL_" +
                   str(i - 1) + "(FUNC, arg , __VA_ARGS__)\n")
    file.write("#define  ___MACRO_UTILS_FE_VAL_" + str(num + 1) +"(FUNC, arg, X, ...) THE_FOREACH_MACRO_CURRENTLY_ONLY_SUPPORTS_UP_TO_" +
               str(num) + "_VALUES  ___MACRO_UTILS_FE_VAL_" + str(num) + "(FUNC, arg, __VA_ARGS__)\n")

    file.write("#define  ___MACRO_UTILS_GET_MACRO(")
    for i in range(0, num + 2):
        file.write("_" + str(i) + ", ")
    file.write("NAME, ...) NAME\n")

    file.write("#define  MACRO_UTILS_FOR_EACH(action, arg, ...)  ___MACRO_UTILS_GET_MACRO(_0, __VA_ARGS__")
    for i in range(num + 1, 0, -1):
        file.write(",  ___MACRO_UTILS_FE_" + str(i))
    file.write(") (action, arg, __VA_ARGS__)\n")

    file.write("#define  ___MACRO_UTILS_GET_MACRO_WITH_VALUE(")
    for i in range(0, num + 2):
        file.write("_" + str(i) + ", ")
    file.write("NAME, ...) NAME\n")

    file.write("#define  MACRO_UTILS_FOR_EACH_WITH_VALUE(action, arg, ...)  ___MACRO_UTILS_GET_MACRO_WITH_VALUE(_0, __VA_ARGS__")
    for i in range(num + 1, 0, -1):
        file.write(",  ___MACRO_UTILS_FE_VAL_" + str(i))
    file.write(") (action, arg, __VA_ARGS__)\n")

    file.write("// count arguments\n")
    file.write("#define  ___MACRO_UTILS_NARGS(...)  ___MACRO_UTILS_NARGS_(__VA_ARGS__")
    for i in range(num, -1, -1):
        file.write(", " + str(i))
    file.write(")\n")

    file.write("#define  ___MACRO_UTILS_NARGS_(")
    for i in range(num, 0, -1):
        file.write("_" + str(i) + ", ")
    file.write("N, ...) N\n")
    file.write("// utility (concatenation)\n")
    file.write("#define  ___MACRO_UTILS_CONC(A, B)  ___MACRO_UTILS_CONC_(A, B)\n")
    file.write("#define  ___MACRO_UTILS_CONC_(A, B) A##B\n\n")
    file.write("#define  ___MACRO_UTILS_GET_ELEM(N, ...)  ___MACRO_UTILS_CONC( ___MACRO_UTILS_GET_ELEM_, N)(__VA_ARGS__)\n")

    for i in range(0, num + 1):
        file.write("#define  ___MACRO_UTILS_GET_ELEM_" + str(i) +"(")
        for j in range(0, i + 1):
            file.write("_" + str(j) + ", ")
        file.write("...) _" + str(i) + "\n")

    file.write("#define  MACRO_UTILS_GET_LAST(...)  ___MACRO_UTILS_GET_ELEM( ___MACRO_UTILS_NARGS(__VA_ARGS__), _, __VA_ARGS__ ,")
    for i in range(0, num):
        file.write(",")
    file.write(")\n")
    file.write("#define  MACRO_UTILS_GET_FIRST(...)  ___MACRO_UTILS_GET_ELEM_0(__VA_ARGS__)\n")

    file.close()


def main():
    generator(256)
if __name__ == "__main__":
    main()