text: ////////////////////////////////////////////////////////////////////////////////
  /// DISCLAIMER
  ///
  /// Copyright 2014-2021 ArangoDB GmbH, Cologne, Germany
  /// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
  ///
  /// 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.
  ///
  /// Copyright holder is ArangoDB GmbH, Cologne, Germany
  ///
  /// @author Dr. Frank Celler
  ////////////////////////////////////////////////////////////////////////////////
  
  #pragma once
  
  #include <cstdint>
  #include "ApplicationFeatures/ApplicationFeature.h"
  
  struct TRI_vocbase_t;
  
  namespace arangodb {
  
  class CheckVersionFeature final : public application_features::ApplicationFeature {
   public:
    explicit CheckVersionFeature(application_features::ApplicationServer& server, int* result,
                                 std::vector<std::type_index> const& nonServerFeatures);
  
   private:
    bool _checkVersion;
  
   public:
    void collectOptions(std::shared_ptr<options::ProgramOptions>) override final;
    void validateOptions(std::shared_ptr<options::ProgramOptions>) override final;
    void start() override final;
  
   private:
    void checkVersion();
  
    int* _result;
    std::vector<std::type_index> _nonServerFeatures;
  };
  
  }  // namespace arangodb
  
  