{"id":477,"date":"2020-05-28T03:49:02","date_gmt":"2020-05-27T17:49:02","guid":{"rendered":"https:\/\/ghiassy.net\/?p=477"},"modified":"2020-05-28T03:51:25","modified_gmt":"2020-05-27T17:51:25","slug":"c-ip-v4-data-type","status":"publish","type":"post","link":"https:\/\/ghiassy.net\/?p=477","title":{"rendered":"C++ IP v4 Data Type"},"content":{"rendered":"

Hello,<\/span><\/p>\n

The class below is one way to implement a class that can read IP address from user’s input in C++; <\/span><\/p>\n

Can convert to string or\/and enumerate in range:<\/span><\/p>\n

<\/p>\n

#include <iostream>\r\n#include <string>\r\n#include <vector>\r\n#include <sstream>\r\n#include <array>\r\n\r\nusing namespace std;\r\nclass ipv4\r\n{\r\n    std::array<unsigned char, 4> data;\r\n\r\npublic:\r\n    constexpr ipv4() : data{{0}} {}\r\n    constexpr ipv4(unsigned char const a, unsigned char const b,\r\n                   unsigned char const c, unsigned char const d) : data{{a, b, c, d}} {}\r\n    explicit constexpr ipv4(unsigned long a) : data{{static_cast<unsigned char>((a >> 24) & 0xFF),\r\n                                                     static_cast<unsigned char>((a >> 16) & 0xFF),\r\n                                                     static_cast<unsigned char>((a >> 8) & 0xFF),\r\n                                                     static_cast<unsigned char>(a & 0xFF)}} {}\r\n    ipv4(ipv4 const &other) noexcept : data(other.data) {}\r\n    ipv4 &operator=(ipv4 const &other) noexcept\r\n    {\r\n        data = other.data;\r\n        return *this;\r\n    }\r\n    std::string to_string() const\r\n    {\r\n        std::stringstream sstr;\r\n        sstr << *this;\r\n        return sstr.str();\r\n    }\r\n    constexpr unsigned long to_ulong() const noexcept\r\n    {\r\n        return (static_cast<unsigned long>(data[0]) << 24) |\r\n               (static_cast<unsigned long>(data[1]) << 16) |\r\n               (static_cast<unsigned long>(data[2]) << 8) |\r\n               static_cast<unsigned long>(data[3]);\r\n    }\r\n    friend std::ostream &operator<<(std::ostream &os, const ipv4 &a)\r\n    {\r\n        os << static_cast<int>(a.data[0]) << '.'\r\n           << static_cast<int>(a.data[1]) << '.'\r\n           << static_cast<int>(a.data[2]) << '.'\r\n           << static_cast<int>(a.data[3]);\r\n        return os;\r\n    }\r\n    friend std::istream &operator>>(std::istream &is, ipv4 &a)\r\n    {\r\n        char d1, d2, d3;\r\n        int b1, b2, b3, b4;\r\n        is >> b1 >> d1 >> b2 >> d2 >> b3 >> d3 >> b4;\r\n        if (d1 == '.' && d2 == '.' && d3 == '.')\r\n            a = ipv4(b1, b2, b3, b4);\r\n        else\r\n            is.setstate(std::ios_base::failbit);\r\n        return is;\r\n    }\r\n\r\n    ipv4 &operator++()\r\n    {\r\n        *this = ipv4(1 + to_ulong());\r\n        return *this;\r\n    }\r\n    ipv4 &operator++(int)\r\n    {\r\n        ipv4 result(*this);\r\n        ++(*this);\r\n        return *this;\r\n    }\r\n    friend bool operator==(ipv4 const &a1, ipv4 const &a2) noexcept\r\n    {\r\n        return a1.data == a2.data;\r\n    }\r\n    friend bool operator!=(ipv4 const &a1, ipv4 const &a2) noexcept { return !(a1 == a2); }\r\n    friend bool operator<(ipv4 const &a1, ipv4 const &a2) noexcept\r\n    {\r\n        return a1.to_ulong() < a2.to_ulong();\r\n    }\r\n    friend bool operator>(ipv4 const &a1, ipv4 const &a2) noexcept { return a2 < a1; }\r\n    friend bool operator<=(ipv4 const &a1, ipv4 const &a2) noexcept { return !(a1 > a2); }\r\n    friend bool operator>=(ipv4 const &a1, ipv4 const &a2) noexcept { return !(a1 < a2); }\r\n\r\n    ipv4 &operator+(int i)\r\n    {\r\n        \/\/cout << \"adding\" << i << endl;\r\n        *this = ipv4(i + to_ulong());\r\n        return *this;\r\n    }\r\n};\r\n\r\nint main()\r\n{\r\n\r\n    ipv4 address(168, 192, 0, 1);\r\n    std::cout << address << std::endl;\r\n    ipv4 ip;\r\n    std::cout << ip << std::endl;\r\n    std::cin >> ip;\r\n\r\n    string test_ip = ip.to_string();\r\n\r\n    if (!std::cin.fail())\r\n        std::cout << ip << std::endl;\r\n\r\n    cout << \"IP: \" << test_ip << endl;\r\n    cout << \"Next IP: \" << ip++ << endl;\r\n    cout << \"Next 5th IP: \" << ip + 5 << endl;\r\n    return 0;\r\n}<\/pre>\n
 <\/p>\n
 <\/p>\n
Hope this helps and good luck.<\/span><\/p>\n
— Saeed \ud83d\ude42<\/span><\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
Hello, The class below is one way to implement a class that can read IP address from user’s input in C++; Can convert to string or\/and enumerate in range:<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,4,1],"tags":[],"class_list":["post-477","post","type-post","status-publish","format-standard","hentry","category-c","category-programming","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/ghiassy.net\/index.php?rest_route=\/wp\/v2\/posts\/477","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ghiassy.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ghiassy.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ghiassy.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ghiassy.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=477"}],"version-history":[{"count":1,"href":"https:\/\/ghiassy.net\/index.php?rest_route=\/wp\/v2\/posts\/477\/revisions"}],"predecessor-version":[{"id":478,"href":"https:\/\/ghiassy.net\/index.php?rest_route=\/wp\/v2\/posts\/477\/revisions\/478"}],"wp:attachment":[{"href":"https:\/\/ghiassy.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=477"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ghiassy.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=477"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ghiassy.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=477"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}