firebase-ios-sdk/Firestore/Swift/Source/SwiftAPI/Pipeline/Expressions/FunctionExpressions/CurrentTimestamp.swift

// Copyright 2024 Google LLC
//
// 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.

import Foundation

/// An expression that represents a server-side timestamp.
///
/// `CurrentTimestamp` is used to generate a timestamp on the server.
/// This is useful for recording current date and time.
///
/// Example:
/// ```swift
/// CurrentTimestamp().as("createdAt")
/// ```
public class CurrentTimestamp: FunctionExpression, @unchecked Sendable {
  public init() {
    super.init("current_timestamp", [])
  }
}