abaddon/discord/snowflake.hpp

#pragma once
#include <cstdint>
#include <nlohmann/json.hpp>
#include <glibmm/ustring.h>

struct Snowflake {
    Snowflake();
    Snowflake(uint64_t n);
    Snowflake(const std::string &str);
    Snowflake(const Glib::ustring &str);

    static Snowflake FromNow(); // not thread safe

    bool IsValid() const;
    std::string GetLocalTimestamp() const;

    bool operator==(const Snowflake &s) const noexcept {
        return m_num == s.m_num;
    }

    bool operator<(const Snowflake &s) const noexcept {
        return m_num < s.m_num;
    }

    operator uint64_t() const noexcept {
        return m_num;
    }

    const static int Invalid = -1;

    friend void from_json(const nlohmann::json &j, Snowflake &s);
    friend void to_json(nlohmann::json &j, const Snowflake &s);

private:
    friend struct std::hash<Snowflake>;
    friend struct std::less<Snowflake>;
    unsigned long long m_num;
};

namespace std {
template<>
struct hash<Snowflake> {
    std::size_t operator()(const Snowflake &k) const {
        return k.m_num;
    }
};

template<>
struct less<Snowflake> {
    bool operator()(const Snowflake &l, const Snowflake &r) const {
        return l.m_num < r.m_num;
    }
};
} // namespace std