itkBuildInformation.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  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.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 itkBuildInformation_h
#define itkBuildInformation_h

#include "itkMacro.h"
#include "itkObject.h"
#include <mutex>
#include "itkSingletonMacro.h"

namespace itk
{
struct BuildInformationGlobals;

class ITKCommon_EXPORT BuildInformation final: public Object
{
public:
  // Using the `rule of zero` to this aggregate type
  // C++20 changes the definition of aggregate such that classes with any user-declared ctors are no longer aggregates.
  ITK_DISALLOW_COPY_AND_ASSIGN(BuildInformation);

  using Self = BuildInformation;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;
  using MapKeyType = std::string;
  using MapValueType = std::string;
  using MapValueDescriptionType = MapValueType;

private:
  class InformationValueType
  {
  public:
    const MapValueType            m_Value;
    const MapValueDescriptionType m_Description;
  };
public:

  using MapStorageType = InformationValueType;
  using MapType = std::map<MapKeyType, MapStorageType >;

  itkTypeMacro(BuildInformation, Object);

  static Pointer New();

  static Pointer GetInstance();
  static const MapType & GetMap();
  static const MapValueType GetValue(const MapKeyType &&);
  static const MapValueDescriptionType  GetDescription(const MapKeyType &&);
  static const std::vector< MapKeyType > GetAllKeys();

private:
  BuildInformation();

  itkGetGlobalDeclarationMacro(BuildInformationGlobals, PimplGlobals);
  static BuildInformationGlobals * m_PimplGlobals;

};  // end of class
} // end namespace itk
#endif