text:  /*
   * 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.
   */
  
  #ifndef __EFFECT_MODERN_CXX_ITEM4_18_H__
  #define __EFFECT_MODERN_CXX_ITEM4_18_H__
  // Item 18: Use std::unique_ptrfor exclusive-ownership resource management.
  
  #include <memory>
  
  class Investment {
  public:
      enum TYPE { STOCK, BOND, REAL_ESTATE };
      virtual TYPE Type() const = 0;
      ~Investment() { }
  };
  
  class Stock : public Investment {
  public:
      TYPE Type() const {
          return STOCK;
      }
  };
  
  class Bond : public Investment {
  public:
      TYPE Type() const {
          return BOND;
      }
  };
  
  class RealEstate : public Investment {
  public:
      TYPE Type() const {
          return REAL_ESTATE;
      }
  };
  
  std::unique_ptr<Investment> makeInvestment(Investment::TYPE type);
  
  #endif // __EFFECT_MODERN_CXX_ITEM4_18_H__