text: ////////////////////////////////////////////////////////////////////////////////
  /// DISCLAIMER
  ///
  /// Copyright 2014-2022 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 Michael Hackstein
  ////////////////////////////////////////////////////////////////////////////////
  
  #pragma once
  
  #include <cstdint>
  #include <functional>
  #include <string_view>
  
  #include "Basics/Common.h"
  
  namespace arangodb {
  
  namespace velocypack {
  class Slice;
  }
  
  namespace graph {
  
  struct EdgeDocumentToken;
  
  /// @brief Abstract class used in the traversals
  /// to abstract away access to indexes / DBServers.
  /// Returns edges as VelocyPack.
  
  class EdgeCursor {
   public:
    virtual ~EdgeCursor() = default;
  
    using Callback = std::function<void(EdgeDocumentToken&&,
                                        arangodb::velocypack::Slice, size_t)>;
  
    virtual bool next(
        std::function<void(EdgeDocumentToken&&, arangodb::velocypack::Slice,
                           size_t)> const& callback) = 0;
  
    virtual void readAll(
        std::function<void(EdgeDocumentToken&&, arangodb::velocypack::Slice,
                           size_t)> const& callback) = 0;
  
    virtual size_t httpRequests() const = 0;
  
    virtual void rearm(std::string_view vid, uint64_t depth) = 0;
  };
  
  }  // namespace graph
  }  // namespace arangodb
  