text: // Licensed to the Apache Software Foundation (ASF) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The ASF licenses this file
  // to you 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 GANDIVA_EXPORTED_FUNCS_REGISTRY_H
  #define GANDIVA_EXPORTED_FUNCS_REGISTRY_H
  
  #include <memory>
  #include <vector>
  
  #include <gandiva/engine.h>
  
  namespace gandiva {
  
  class ExportedFuncsBase;
  
  /// Registry for classes that export functions which can be accessed by
  /// LLVM/IR code.
  class ExportedFuncsRegistry {
   public:
    using list_type = std::vector<std::shared_ptr<ExportedFuncsBase>>;
  
    // Add functions from all the registered classes to the engine.
    static void AddMappings(Engine* engine);
  
    static bool Register(std::shared_ptr<ExportedFuncsBase> entry) {
      registered().push_back(entry);
      return true;
    }
  
   private:
    static list_type& registered() {
      static list_type registered_list;
      return registered_list;
    }
  };
  
  #define REGISTER_EXPORTED_FUNCS(classname) \
    static bool _registered_##classname =    \
        ExportedFuncsRegistry::Register(std::make_shared<classname>())
  
  }  // namespace gandiva
  
  #endif  // GANDIVA_EXPORTED_FUNCS_REGISTRY_H
  