#include <WinSock2.h>
#include <ws2tcpip.h>
#include <iphlpapi.h>

struct AddrInfoPtr {
    struct addrinfo *info;

    AddrInfoPtr() noexcept:
    info(nullptr) {}
    ~AddrInfoPtr() noexcept {
        freeaddrinfo(info);
    }

    addrinfo** operator&() noexcept {
        return &info;
    }
    addrinfo& operator*() noexcept {
        return *info;
    }
    addrinfo* operator->() noexcept {
        return info;
    }
    const addrinfo& operator*() const noexcept {
        return *info;
    }

    operator addrinfo*() noexcept {
        return info;
    }
};

struct AddrInfo {
    struct addrinfo info;

    static AddrInfoPtr get_local_addrinfo(PCSTR port) {
        AddrInfo hints;

        hints->ai_family = AF_INET;
        hints->ai_socktype = SOCK_STREAM;
        hints->ai_protocol = IPPROTO_TCP;
        hints->ai_flags = AI_PASSIVE;

        return hints.get_addrinfo(NULL, port);
    }

    AddrInfo() noexcept {
        ZeroMemory(&info, sizeof(info));
    }
    ~AddrInfo() noexcept = default;

    addrinfo* operator->() noexcept {
        return &info;
    }
    addrinfo* operator&() noexcept {
        return &info;
    }

    operator const addrinfo&() const noexcept {
        return info;
    }
    operator addrinfo&() noexcept {
        return info;
    }

    AddrInfoPtr get_addrinfo(PCSTR node, PCSTR service) {
        AddrInfoPtr ptr;
        int result = getaddrinfo(node, service, &info, &ptr);
        if (result == SOCKET_ERROR) throw result;
        return ptr;
    }
};