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/*************************************************************************
*
* Copyright 2020 Realm Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**************************************************************************/
#ifndef REALM_UUID_HPP
#define REALM_UUID_HPP
#include <realm/string_data.hpp>
namespace realm {
struct InvalidUUIDString : std::logic_error {
using std::logic_error::logic_error;
};
/// A UUID is a sequence of 16 bytes (128 bits)
class UUID {
public:
static constexpr size_t num_bytes = 16;
using UUIDBytes = std::array<uint8_t, num_bytes>;
/// A string is considered valid if it contains only hex [a-f, 0-9]
/// and hyphens in the correct sequence, case insensitive. For
/// example: "01234567-9abc-4def-9012-3456789abcde" is valid.
/// Other than the above, this function does not check the validity
/// of the bits according to the rfc spec in order to allow for any
/// user defined bit pattern and future compatibility.
static bool is_valid_string(StringData) noexcept;
/// This constructor may throw InvalidUUIDString if the format
/// of the parameter is invalid according to `is_valid_string`
explicit UUID(StringData);
/// Constructs a UUID with all zero bytes
UUID()
noexcept
: m_bytes{}
{
}
explicit UUID(const UUIDBytes& raw) noexcept
: m_bytes(raw)
{
}
bool operator==(const UUID& other) const
{
return m_bytes == other.m_bytes;
}
bool operator!=(const UUID& other) const
{
return m_bytes != other.m_bytes;
}
bool operator>(const UUID& other) const
{
return m_bytes > other.m_bytes;
}
bool operator<(const UUID& other) const
{
return m_bytes < other.m_bytes;
}
bool operator>=(const UUID& other) const
{
return m_bytes >= other.m_bytes;
}
bool operator<=(const UUID& other) const
{
return m_bytes <= other.m_bytes;
}
std::string to_string() const;
std::string to_base64() const;
UUIDBytes to_bytes() const
{
return m_bytes;
}
inline size_t hash() const noexcept
{
return murmur2_or_cityhash(m_bytes.data(), sizeof(m_bytes));
}
private:
UUIDBytes m_bytes = {};
};
inline std::ostream& operator<<(std::ostream& ostr, const UUID& id)
{
ostr << id.to_string();
return ostr;
}
} // namespace realm
namespace std {
template <>
struct hash<realm::UUID> {
size_t operator()(const realm::UUID& uuid) const noexcept
{
return uuid.hash();
}
};
} // namespace std
#endif /* REALM_UUID_HPP */
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