RegisteredParsingObject.h

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//
//
/*
    Copyright (C) 2000- 2007, Hammersmith Imanet Ltd
    This file is part of STIR.
 
    SPDX-License-Identifier: Apache-2.0
 
    See STIR/LICENSE.txt for details
*/
 
#ifndef __stir_RegisteredParsingObject_H__
#define __stir_RegisteredParsingObject_H__
 
#include "stir/ParsingObject.h"
#include <string>
 
START_NAMESPACE_STIR
template <typename Derived, typename Base, typename Parent = Base>
class RegisteredParsingObject : public Parent
{
public:
  // import constructors from Parent
  // Note: disabled for older SWIG as that generates an error before 4.2, and a warning for 4.2
#if !defined(SWIG) || (SWIG_VERSION >= 0x040300)
  using Parent::Parent;
#endif


  inline static Base* read_from_stream(std::istream*);

  inline std::string get_registered_name() const override;
  inline std::string parameter_info() override;
 
public:
#ifndef SWIG
  struct RegisterIt
  {
    RegisterIt()
    {
      // std::cerr << "Adding " << Derived::registered_name <<" to registry"<<std::endl;
      //  note: VC 7.0 needs a '&' in front of read_from_stream for some reason
      Parent::registry().add_to_registry(Derived::registered_name, &read_from_stream);
    }

    ~RegisterIt()
    {
#  if 0
      // does not work yet, as registry might be destructed before this
      // RegisterIt object. A solution to this problem is coming up.
      cerr << "In RegisterIt destructor for " << Derived::registered_name<<endl;
      cerr <<"Current keys: ";
      Parent::registry().list_keys(cerr);
      Parent::registry().remove_from_registry(Derived::registered_name);
#  endif
    }
  };
  // RegisterIt needs to be a friend to have access to registry()
  friend struct RegisterIt;
#endif
};
 
END_NAMESPACE_STIR
 
#include "stir/RegisteredParsingObject.inl"
 
#endif