// Copyright © SurrealDB Ltd

//

// 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.

//! This module stores a MVCC versioned entry.

use bytes::Bytes;

use std::cmp::Ordering;

#[derive(Clone, Eq, PartialEq)]

pub struct Version {

  /// The version of this entry

  pub(crate) version: u64,

  /// The value of this entry. If this is

  /// None, then the key is deleted and if

  /// it is Some then the key exists.

  pub(crate) value: Option<Bytes>,

}

impl Ord for Version {

  #[inline]

  fn cmp(&self, other: &Self) -> Ordering {

    self.version.cmp(&other.version)

  }

}

impl PartialOrd for Version {

  #[inline]

  fn partial_cmp(&self, other: &Self) -> Option<Ordering> {

    Some(self.cmp(other))

  }

}