UUID.cpp

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#include <iomanip>
#include <random>
#include <sstream>
 
#include "UUID.hpp"
 
namespace galaxy
{
    UUID::UUID()
    {
        std::mt19937_64                              engine {std::random_device()()};
        std::uniform_int_distribution<std::uint64_t> dist {0, 255};
 
        for (auto index = 0; index < 16; ++index)
        {
            m_uuid[index] = static_cast<unsigned char>(dist(engine));
        }
 
        m_uuid[6] = ((m_uuid[6] & 0x0f) | 0x40); // Version 4
        m_uuid[8] = ((m_uuid[8] & 0x3f) | 0x80); // Variant is 10
 
        std::stringstream hex;
        hex << std::hex << std::setfill('0');
 
        for (int i = 0; i < 16; ++i)
        {
            hex << std::setw(2) << static_cast<int>(m_uuid[i]);
 
            if (i == 3 || i == 5 || i == 7 || i == 9)
            {
                hex << '-';
            }
        }
 
        m_str = hex.str();
    }
 
    UUID::UUID(UUID&& g) noexcept
    {
        this->m_uuid = std::move(g.m_uuid);
        this->m_str  = std::move(g.m_str);
    }
 
    UUID& UUID::operator=(UUID&& g) noexcept
    {
        if (this != &g)
        {
            this->m_uuid = std::move(g.m_uuid);
            this->m_str  = std::move(g.m_str);
        }
 
        return *this;
    }
 
    UUID::UUID(const UUID& g) noexcept
    {
        this->m_uuid = g.m_uuid;
        this->m_str  = g.m_str;
    }
 
    UUID& UUID::operator=(const UUID& g) noexcept
    {
        if (this != &g)
        {
            this->m_uuid = g.m_uuid;
            this->m_str  = g.m_str;
        }
 
        return *this;
    }
 
    UUID::~UUID() noexcept
    {
    }
 
    std::size_t UUID::hash() noexcept
    {
        std::size_t h = 0;
        for (auto b : m_uuid)
        {
            h ^= static_cast<std::size_t>(b) + 0x9e3779b9 + (h << 6) + (h >> 2);
        }
        return h;
    }
 
    const std::string& UUID::str() const noexcept
    {
        return m_str;
    }
 
    bool UUID::operator==(const UUID& rhs) noexcept
    {
        return m_uuid == rhs.m_uuid;
    }
 
    bool UUID::operator!=(const UUID& rhs) noexcept
    {
        return !operator==(rhs);
    }
} // namespace galaxy