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  1. #include <map>
  2. #include <vector>
  3. #include <string>
  4. #include <iostream>
  5. #include <cstring>
  6. #include <utility>
  7. #include <functional>
  8.  
  9. namespace json {
  10.  
  11. class value;
  12.  
  13. typedef std::vector<value> array;
  14. typedef std::map<std::string, value> object;
  15. typedef std::string string;
  16.  
  17. enum class type
  18. {
  19.     null, // it is not realy a type but a value
  20.     boolean,
  21.     integer,
  22.     number,
  23.     string,
  24.     object,
  25.     array
  26. };
  27.  
  28. class value
  29. {
  30. public:
  31.     value();
  32.     ~value();
  33.  
  34.     value(double number);
  35.     value(int integer);
  36.     value(bool b);
  37.     value(char const* str);
  38.     value(json::string const& str);
  39.     value(json::array const& arr);
  40.     value(json::object const& obj);
  41.  
  42.     value(json::string&& str);
  43.     value(json::array&& arr);
  44.     value(json::object&& obj);
  45.  
  46.     value(value const& val);
  47.     value(value&& val);
  48.  
  49.     // assignment operators
  50.     value& operator=(double number);
  51.     value& operator=(int integer);
  52.     value& operator=(bool b);
  53.     value& operator=(json::string const& str);
  54.     value& operator=(json::array const& arr);
  55.     value& operator=(json::object const& obj);
  56.  
  57.     value& operator=(json::string&& str);
  58.     value& operator=(json::array&& arr);
  59.     value& operator=(json::object&& obj);
  60.  
  61.     value& operator=(value const& val);
  62.     value& operator=(value&& val);
  63.  
  64.     void clear();
  65.  
  66. public:
  67.     json::type type;
  68.     union
  69.     {
  70.         int integer;
  71.         double number;
  72.         bool boolean;
  73.         json::string* str;
  74.         json::array* arr;
  75.         json::object* obj;
  76.     };
  77. };
  78.  
  79. }
  80.  
  81.  
  82. namespace json {
  83.  
  84.  
  85. value::value() : type(json::type::null)
  86. {
  87.     std::cerr << "default constructor null" << '\n';
  88. }
  89.  
  90. value::~value()
  91. {
  92.     std::cerr << "destructor" << '\n';
  93.     clear();
  94. }
  95.  
  96. value::value(double number) : type(json::type::number), number(number)
  97. {
  98.     std::cerr << "copy constructor number" << '\n';
  99. }
  100.  
  101. value::value(int integer) : type(json::type::integer), integer(integer)
  102. {
  103.     std::cerr << "copy constructor integer" << '\n';
  104. }
  105.  
  106. value::value(bool b) : type(json::type::boolean), boolean(b)
  107. {
  108.     std::cerr << "copy constructor boolean" << '\n';
  109. }
  110.  
  111. value::value(char const* str) : value(json::string(str))
  112. {
  113. }
  114.  
  115. value::value(json::string const& str) : type(json::type::string), str(new json::string(str))
  116. {
  117.     std::cerr << "copy constructor string" << '\n';
  118. }
  119.  
  120. value::value(json::array const& arr) : type(json::type::array), arr(new json::array(arr))
  121. {
  122.     std::cerr << "copy constructor array" << '\n';
  123. }
  124.  
  125. value::value(json::object const& obj) : type(json::type::object), obj(new json::object(obj))
  126. {
  127.     std::cerr << "copy constructor object" << '\n';
  128. }
  129.  
  130. value::value(value const& val)
  131. {
  132.     std::cerr << "copy constructor value" << '\n';
  133.     switch (val.type)
  134.     {
  135.     case json::type::array:
  136.         {
  137.             arr = new json::array(*val.arr);
  138.             type = json::type::array;
  139.         }
  140.         break;
  141.     case json::type::string:
  142.         {
  143.             str = new json::string(*val.str);
  144.             type = json::type::string;
  145.         }
  146.         break;
  147.     case json::type::object:
  148.         {
  149.             obj = new json::object(*val.obj);
  150.             type = json::type::object;
  151.         }
  152.         break;
  153.     default:
  154.         std::memcpy(this, &val, sizeof(val));
  155.     }
  156. }
  157.  
  158. value::value(json::string && str)
  159.     : type(json::type::string)
  160.     , str(new json::string(std::move(str)))
  161. {
  162.     std::cerr << "move constructor string" << '\n';
  163. }
  164.  
  165. value::value(json::array && arr)
  166.     : type(json::type::array)
  167.     , arr(new json::array(std::move(arr)))
  168. {
  169.     std::cerr << "move constructor array" << '\n';
  170. }
  171.  
  172. value::value(json::object && obj)
  173.     : type(json::type::object)
  174.     , obj(new json::object(std::move(obj)))
  175. {
  176.     std::cerr << "move constructor object" << '\n';
  177. }
  178.  
  179. value::value(value && val)
  180. {
  181.     std::cerr << "move constructor value" << '\n';
  182.     std::memcpy(this, &val, sizeof(val));
  183.     val.type = json::type::null;
  184. }
  185.  
  186. value& value::operator=(double number)
  187. {
  188.     std::cerr << "assignment number" << '\n';
  189.     clear();
  190.     type = json::type::number;
  191.     this->number = number;
  192.     return *this;
  193. }
  194. value& value::operator=(int integer)
  195. {
  196.     std::cerr << "assignment integer" << '\n';
  197.     clear();
  198.     type = json::type::integer;
  199.     this->integer = integer;
  200.     return *this;
  201. }
  202.  
  203. value& value::operator=(bool b)
  204. {
  205.     std::cerr << "assignment bool" << '\n';
  206.     clear();
  207.     type = json::type::integer;
  208.     this->integer = integer;
  209.     return *this;
  210. }
  211.  
  212. value& value::operator=(json::string const& str)
  213. {
  214.     std::cerr << "assignment string" << '\n';
  215.     clear();
  216.     this->str = new json::string(str);
  217.     type = json::type::string;
  218.     return *this;
  219. }
  220.  
  221. value& value::operator=(json::array const& arr)
  222. {
  223.     std::cerr << "assignment array" << '\n';
  224.     clear();
  225.     this->arr = new json::array(arr);
  226.     type = json::type::array;
  227.     return *this;
  228. }
  229.  
  230. value& value::operator=(json::object const& obj)
  231. {
  232.     std::cerr << "assignment object" << '\n';
  233.     clear();
  234.     this->obj = new json::object(obj);
  235.     type = json::type::object;
  236.     return *this;
  237. }
  238.  
  239. value& value::operator=(value const& val)
  240. {
  241.     std::cerr << "assignment value" << '\n';
  242.     clear();
  243.     switch (val.type)
  244.     {
  245.     case json::type::array:
  246.         {
  247.             arr = new json::array(*val.arr);
  248.             type = json::type::array;
  249.         }
  250.         break;
  251.     case json::type::string:
  252.         {
  253.             str = new json::string(*val.str);
  254.             type = json::type::string;
  255.         }
  256.         break;
  257.     case json::type::object:
  258.         {
  259.             obj = new json::object(*val.obj);
  260.             type = json::type::object;
  261.         }
  262.         break;
  263.     default:
  264.         std::memcpy(this, &val, sizeof(val));
  265.     }
  266.     return *this;
  267. }
  268.  
  269. value& value::operator=(json::string&& str)
  270. {
  271.     std::cerr << "move assignment string" << '\n';
  272.     clear();
  273.     this->str = new json::string(std::move(str));
  274.     type = json::type::string;
  275.     return *this;
  276. }
  277.  
  278. value& value::operator=(json::array&& arr)
  279. {
  280.     std::cerr << "move assignment array" << '\n';
  281.     clear();
  282.     this->arr = new json::array(std::move(arr));
  283.     type = json::type::array;
  284.     return *this;
  285. }
  286.  
  287. value& value::operator=(json::object&& obj)
  288. {
  289.     std::cerr << "move assignment object" << '\n';
  290.     clear();
  291.     this->obj = new json::object(std::move(obj));
  292.     type = json::type::object;
  293.     return *this;
  294. }
  295.  
  296. value& value::operator=(value && val)
  297. {
  298.     std::cerr << "move assignment value" << '\n';
  299.     clear();
  300.     std::memcpy(this, &val, sizeof(val));
  301.     val.type = json::type::null;
  302.     return *this;
  303. }
  304.  
  305. void value::clear()
  306. {
  307.     switch (type)
  308.     {
  309.     case json::type::array:
  310.         {
  311.             delete arr;
  312.         }
  313.         break;
  314.     case json::type::string:
  315.         {
  316.             delete str;
  317.         }
  318.         break;
  319.     case json::type::object:
  320.         {
  321.             delete obj;
  322.         }
  323.         break;
  324.     }
  325.     type = json::type::null;
  326. }
  327.  
  328.  
  329. }
  330.  
  331. int main(int argc, char* argv [])
  332. {
  333.     json::string s = "HelloWorld";
  334.     json::value v_str = std::move(s);
  335.     json::value v_arr = std::move(std::vector<json::value>{std::cref(v_str)});
  336.  
  337.     return 0;
  338. }
Success #stdin #stdout #stderr 0s 3036KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
stderr 
move constructor string
copy constructor value
copy constructor value
move constructor array
destructor
destructor
destructor
destructor
https://ideone.com/ig82lR
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
public

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