text: /**
   *    Copyright (C) 2018-present MongoDB, Inc.
   *
   *    This program is free software: you can redistribute it and/or modify
   *    it under the terms of the Server Side Public License, version 1,
   *    as published by MongoDB, Inc.
   *
   *    This program is distributed in the hope that it will be useful,
   *    but WITHOUT ANY WARRANTY; without even the implied warranty of
   *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *    Server Side Public License for more details.
   *
   *    You should have received a copy of the Server Side Public License
   *    along with this program. If not, see
   *    <http://www.mongodb.com/licensing/server-side-public-license>.
   *
   *    As a special exception, the copyright holders give permission to link the
   *    code of portions of this program with the OpenSSL library under certain
   *    conditions as described in each individual source file and distribute
   *    linked combinations including the program with the OpenSSL library. You
   *    must comply with the Server Side Public License in all respects for
   *    all of the code used other than as permitted herein. If you modify file(s)
   *    with this exception, you may extend this exception to your version of the
   *    file(s), but you are not obligated to do so. If you do not wish to do so,
   *    delete this exception statement from your version. If you delete this
   *    exception statement from all source files in the program, then also delete
   *    it in the license file.
   */
  #pragma once
  
  #include "mongo/base/concept/convertible_to.h"
  
  namespace mongo {
  namespace concept {
      /**
       * The `UniquePtr` Concept models a movable owning pointer of an object.
       * `std::unique_ptr< T >` is a model of `mongo::concept::UniquePtr< T >`.
       */
      template <typename T>
      struct UniquePtr {
          /** The `UniquePtr< T >` must retire its pointer to `T` on destruction. */
          ~UniquePtr() noexcept;
  
          UniquePtr(UniquePtr&& p);
          UniquePtr& operator=(UniquePtr&& p);
  
          UniquePtr();
          UniquePtr(T* p);
  
          ConvertibleTo<T*> operator->() const;
          T& operator*() const;
  
          explicit operator bool() const;
  
          ConvertibleTo<T*> get() const;
  
          void reset() noexcept;
          void reset(ConvertibleTo<T*>);
      };
  
      /*! A `UniquePtr` object must be equality comparable. */
      template <typename T>
      bool operator==(const UniquePtr<T>& lhs, const UniquePtr<T>& rhs);
  
      /*! A `UniquePtr` object must be inequality comparable. */
      template <typename T>
      bool operator!=(const UniquePtr<T>& lhs, const UniquePtr<T>& rhs);
  }  // namespace concept
  }  // namespace mongo
  