text: /*=========================================================================
   *
   *  Copyright NumFOCUS
   *
   *  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
   *
   *         https://www.apache.org/licenses/LICENSE-2.0.txt
   *
   *  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 itkMultipleLogOutput_h
  #define itkMultipleLogOutput_h
  
  #include "itkLogOutput.h"
  
  #include <fstream>
  #include <set>
  
  namespace itk
  {
  /** \class MultipleLogOutput
   * \brief Allows writing simultaneously to multiple streams. Note that the
   *        class derives from std::streambuf and contains a
   *        std::set<> of LogOutput.
   *
   * \author Hee-Su Kim, Compute Science Dept. Kyungpook National University,
   *                     ISIS Center, Georgetown University.
   *
   * \ingroup OSSystemObjects LoggingObjects
   * \ingroup ITKCommon
   */
  
  class ITKCommon_EXPORT MultipleLogOutput : public LogOutput
  {
  public:
    ITK_DISALLOW_COPY_AND_MOVE(MultipleLogOutput);
  
    using Self = MultipleLogOutput;
    using Superclass = LogOutput;
    using Pointer = SmartPointer<Self>;
    using ConstPointer = SmartPointer<const Self>;
  
    using OutputType = LogOutput;
  
    itkTypeMacro(MultipleLogOutput, LogOutput);
    itkNewMacro(MultipleLogOutput);
  
  public:
    /** Register a additional output stream into the list of LogOutputs to write
     * to. The messages will be sent to the streams in the same order that the
     * streams have been added here.  */
    void
    AddLogOutput(OutputType * output);
  
    /** Broadcast a flush operation to all the output streams */
    void
    Flush() override;
  
    /** Write to multiple outputs */
    void
    Write(double timestamp) override;
  
    /** Write to multiple outputs */
    void
    Write(const std::string & content) override;
  
    /** Write to a buffer */
    void
    Write(const std::string & content, double timestamp) override;
  
  protected:
    /** Constructor */
    MultipleLogOutput();
  
    /** Destructor */
    ~MultipleLogOutput() override;
  
  private:
    using ContainerType = std::set<OutputType::Pointer>;
  
    ContainerType m_Output;
  };
  } // namespace itk
  
  #endif // itkMultipleLogOutput_h
  