uuid.hpp

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// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
 
#pragma once
 
#include <array>
#include <cstdint>
#include <string>
 
namespace Azure { namespace Core {
  class Uuid final {
  public:
    using ValueArray = std::array<std::uint8_t, 16>;
 
  private:
    ValueArray m_uuid{};
 
  private:
    constexpr Uuid(ValueArray const& uuid) : m_uuid(uuid) {}
 
  public:
    // Nil UUID, per RFC9562, consists of all zeros:
    // https://www.rfc-editor.org/rfc/rfc9562.html#name-nil-uuid
    constexpr explicit Uuid() : m_uuid{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} {}
 
    std::string ToString() const;
 
    constexpr ValueArray const& AsArray() const { return m_uuid; }
 
    static Uuid CreateUuid();
 
    static constexpr Uuid CreateFromArray(ValueArray const& uuid) { return Uuid{uuid}; }
 
    static Uuid Parse(std::string const& uuidString);
 
    constexpr bool operator==(Uuid const& other) const
    {
      if (this != &other)
      {
        // std::array::operator==() is not a constexpr until C++20
        for (size_t i = 0; i < m_uuid.size(); ++i)
        {
          if (m_uuid[i] != other.m_uuid[i])
          {
            return false;
          }
        }
      }
 
      return true;
    }
 
    constexpr bool operator!=(Uuid const& other) const { return !(*this == other); }
 
    constexpr bool IsNil() const
    {
      // Nil UUID, per RFC9562, consists of all zeros:
      // https://www.rfc-editor.org/rfc/rfc9562.html#name-nil-uuid
      for (size_t i = 0; i < m_uuid.size(); ++i)
      {
        if (m_uuid[i] != 0)
        {
          return false;
        }
      }
 
      return true;
    }
  };
}} // namespace Azure::Core