1. C++ / Говнокод #28953

    0

    1. 001
    2. 002
    3. 003
    4. 004
    5. 005
    6. 006
    7. 007
    8. 008
    9. 009
    10. 010
    11. 011
    12. 012
    13. 013
    14. 014
    15. 015
    16. 016
    17. 017
    18. 018
    19. 019
    20. 020
    21. 021
    22. 022
    23. 023
    24. 024
    25. 025
    26. 026
    27. 027
    28. 028
    29. 029
    30. 030
    31. 031
    32. 032
    33. 033
    34. 034
    35. 035
    36. 036
    37. 037
    38. 038
    39. 039
    40. 040
    41. 041
    42. 042
    43. 043
    44. 044
    45. 045
    46. 046
    47. 047
    48. 048
    49. 049
    50. 050
    51. 051
    52. 052
    53. 053
    54. 054
    55. 055
    56. 056
    57. 057
    58. 058
    59. 059
    60. 060
    61. 061
    62. 062
    63. 063
    64. 064
    65. 065
    66. 066
    67. 067
    68. 068
    69. 069
    70. 070
    71. 071
    72. 072
    73. 073
    74. 074
    75. 075
    76. 076
    77. 077
    78. 078
    79. 079
    80. 080
    81. 081
    82. 082
    83. 083
    84. 084
    85. 085
    86. 086
    87. 087
    88. 088
    89. 089
    90. 090
    91. 091
    92. 092
    93. 093
    94. 094
    95. 095
    96. 096
    97. 097
    98. 098
    99. 099
    100. 100
    #define EMPTY(...)
#define DEFER(...) __VA_ARGS__ EMPTY()
#define EXPAND(...) __VA_ARGS__
#define PARENS ()
#define CONCAT_IMPL(L, R) L ## R
#define CONCAT(L, R) CONCAT_IMPL(L, R)
#define EVAL(...) __VA_ARGS__
#define EVAL_1(...) __VA_ARGS__
#define EVAL_1_1(...) __VA_ARGS__
#define EVAL_1_2(...) __VA_ARGS__
#define EVAL_2(...) EVAL_1(EVAL_1(__VA_ARGS__))
#define EVAL_4(...) EVAL_2(EVAL_2(__VA_ARGS__))
#define EVAL_8(...) EVAL_4(EVAL_4(__VA_ARGS__))
#define EVAL_16(...) EVAL_8(EVAL_8(__VA_ARGS__))
#define EVAL_32(...) EVAL_16(EVAL_16(__VA_ARGS__))
#define EVAL_64(...) EVAL_32(EVAL_32(__VA_ARGS__))
#define EVAL_128(...) EVAL_64(EVAL_64(__VA_ARGS__))
#define EVAL_256(...) EVAL_128(EVAL_128(__VA_ARGS__))
#define EVAL_512(...) EVAL_256(EVAL_256(__VA_ARGS__))
#define EVAL_1024(...) EVAL_512(EVAL_512(__VA_ARGS__))
#define FOR_EACH_64(MACRO, ...) EVAL_64(FOR_EACH_IMPL(MACRO, __VA_ARGS__))
#define FOR_EACH_128(MACRO, ...) EVAL_128(FOR_EACH_IMPL(MACRO, __VA_ARGS__))
#define FOR_EACH_256(MACRO, ...) EVAL_256(FOR_EACH_IMPL(MACRO, __VA_ARGS__))
#define FOR_EACH_512(MACRO, ...) EVAL_512(FOR_EACH_IMPL(MACRO, __VA_ARGS__))
#define FOR_EACH_1024(MACRO, ...) EVAL_1024(FOR_EACH_IMPL(MACRO, __VA_ARGS__))
#define FOR_EACH(MACRO, ...) EVAL_1024(FOR_EACH_IMPL(MACRO, __VA_ARGS__))
#define FOR_EACH_NEXT() FOR_EACH_IMPL
#define FOR_EACH_IMPL(MACRO, ARG1, ...) MACRO(ARG1)__VA_OPT__(FOR_EACH_NEXT PARENS (MACRO, __VA_ARGS__))
#define SELECT(FIRST, ...) FIRST
#define SELECT_SECOND(FIRST, ...) __VA_ARGS__
#define DISCARD_1(FIRST, ...) SELECT##__VA_OPT__(_SECOND)(FIRST, __VA_ARGS__)
#define REMOVE_PARENTHESES_IMPL(ARG, _, ...) __VA_OPT__(EVAL) ARG
#define REMOVE_PARENTHESES(ARG) EVAL_1(DEFER(REMOVE_PARENTHESES_IMPL)(ARG, CHECK_PARENTHESES ARG))
#define CHECK_PARENTHESES(...) _, __VA_ARGS__
#define MAKE_HELPER_STRUCT(COUNTER, ...) template<EVAL_1024(MAKE_HELPER_STRUCT_IMPL(COUNTER, __VA_ARGS__))
#define MEMBER_POINTER_CONCAT(_, ...) FOR_EACH_256(MEMBER_POINTER_CONCAT_ONCE, __VA_ARGS__)
#define MEMBER_POINTER_CONCAT_ONCE(ARG) auto EVAL_1_1(DEFER(DISCARD_1)(REMOVE_PARENTHESES(ARG))), EMPTY()
#define MAKE_HELPER_STRUCT_IMPL(COUNTER, ARG1, ...) EVAL_1_2(DEFER(MAKE_HELPER_STRUCT_IMPL_DISPATCH)(COUNTER, ARG1, (__VA_ARGS__), CHECK_PARENTHESES ARG1))
#define MAKE_HELPER_STRUCT_IMPL_DISPATCH(COUNTER, ARG1, ARGS, _, ...) MAKE_HELPER_STRUCT_IMPL_TASK##__VA_OPT__(_EXEC)(COUNTER, CONCAT(ARG1, EVAL ARGS), __VA_ARGS__) __VA_OPT__(MAKE_HELPER_STRUCT_NEXT PARENS (COUNTER, EVAL ARGS))
#define MAKE_HELPER_STRUCT_IMPL_TASK(COUNTER, FUNCTIONS, ...) void *> struct intrusive_function_helper_##COUNTER { FUNCTIONS };
#define MAKE_HELPER_STRUCT_IMPL_TASK_EXEC(_1, _2, ...) MEMBER_POINTER_CONCAT(__VA_ARGS__)
#define MAKE_HELPER_STRUCT_NEXT() MAKE_HELPER_STRUCT_IMPL
#define CLASS_CONCAT(CLASS, ...) EVAL_256(CLASS_CONCAT_IMPL(CLASS, __VA_ARGS__))
#define CLASS_CONCAT_IMPL(CLASS, ARG1, ...) &CLASS::EVAL(DEFER(SELECT)(REMOVE_PARENTHESES(ARG1))), __VA_OPT__(CLASS_CONCAT_NEXT PARENS (CLASS, __VA_ARGS__))
#define CLASS_CONCAT_NEXT() CLASS_CONCAT_IMPL
#define MAKE_TEMPLATE_INST(COUNTER, ...) template struct intrusive_function_helper_##COUNTER<EVAL_1024(MAKE_TEMPLATE_INST_IMPL(__VA_ARGS__)) nullptr>
#define MAKE_TEMPLATE_INST_IMPL(ARG1, ...) EVAL_1_1(DEFER(MAKE_TEMPLATE_INST_IMPL_DISPATCH)((__VA_ARGS__), CHECK_PARENTHESES ARG1))
#define MAKE_TEMPLATE_INST_IMPL_DISPATCH(ARGS, _, ...) MAKE_TEMPLATE_INST_IMPL_TASK##__VA_OPT__(_EXEC)(__VA_ARGS__) __VA_OPT__(MAKE_TEMPLATE_INST_NEXT PARENS ARGS)
#define MAKE_TEMPLATE_INST_IMPL_TASK(...)
#define MAKE_TEMPLATE_INST_IMPL_TASK_EXEC(...) CLASS_CONCAT(__VA_ARGS__)
#define MAKE_TEMPLATE_INST_NEXT() MAKE_TEMPLATE_INST_IMPL
#define DEFINE_INTRUSIVE_FUNCTIONS_IMPL(COUNTER, ...) MAKE_HELPER_STRUCT(COUNTER, __VA_ARGS__) MAKE_TEMPLATE_INST(COUNTER, __VA_ARGS__)
#define DEFINE_INTRUSIVE_FUNCTIONS(...) DEFINE_INTRUSIVE_FUNCTIONS_IMPL(__COUNTER__, __VA_ARGS__);
template<class T> T force_create() { char bytes[sizeof(T)]{}; return *reinterpret_cast<T *>(bytes); }

//=======================================================================================//
#include <iostream>
#include <tuple>

class Person {
private:
  class BankAccount { int money; } bank_account;
  int money;
  std::string name;
  std::string status;
  Person() = delete;
};

DEFINE_INTRUSIVE_FUNCTIONS((Person, name, bank_account, money, status), (Person::BankAccount, (money, bank_money)),
friend Person force_create_person(auto ...args) {
  auto p = force_create<Person>();
  std::tie(p.*name, p.*status, p.*bank_account.*bank_money, p.*money) = std::make_tuple(args...);
  return p;
}
friend void force_print(const Person &p) {
  std::cout << p.*name
            << "\n  status: "     << p.*status
            << "\n  bank_money: " << p.*bank_account.*bank_money
            << "\n  money: "      << p.*money
            << "\n";
}
friend void force_rob(Person &p) {
  p.*status                   = "poor";
  p.*bank_account.*bank_money = std::min(0, p.*bank_account.*bank_money);
  p.*money                    = std::min(0, p.*money);
})

Person force_create_person(auto ...args);
void   force_print(const Person &p);
void   force_rob(Person &p);

int main() {
  auto p = force_create_person("John", "rich", 999999, 4242);
  force_print(p);
  force_rob  (p);
  force_print(p); // John
                             //   status: poor
                             //   bank_money: 0
                             //   money: 0
}

    Принудительный доступ к закрытым членам в C++

    Запостил: ShittyCode42, 21 Июля 2024

    Комментарии (3) RSS

    Добавить комментарий