IInspector.h

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#ifndef GAUDIKERNEL_IINSPECTOR_H
#define GAUDIKERNEL_IINSPECTOR_H

// STL Include files
#include <typeinfo>
#include <string>

// Framework Include files
#include "GaudiKernel/IInterface.h"

class GAUDI_API IInspector: virtual public IInterface {
public:
  DeclareInterfaceID(IInspector,1,0);

  enum { Mutable = 1<<1, Const = 1<<2 };

protected:

  class IValue  {
  protected:
    void* m_P;
    IValue() = default;
  public:
    virtual ~IValue() = default;
    virtual void release()        {      delete this;          }
    void* ptr()                   {      return m_P;           }
    const void* ptr()  const      {      return m_P;           }
    virtual long size()  const = 0;
    virtual void construct(void* buffer) const = 0;
  };

  struct Tag  {
    long             first;
    const std::type_info& second;
    Tag(long f, const std::type_info& s) : first(f), second(s) {    }
  };

private:
  template <class T> class _V : public IValue    {
    T m_O;
  public:
    _V(const T& v) : m_O(v)       {      m_P = &m_O;           }
    virtual ~_V() = default;
    virtual long size()  const  {      return sizeof(T);     }
    virtual void construct(void* b) const { ::new(b) T();     }
  };

  template <class T> class _TT : public Tag   {
  public:    _TT() : Tag(sizeof(T), typeid(T))    {         }
  };

protected:
  // Referenced implementation of the IInspector interface:
  virtual StatusCode inspectByRef(const void* pObj, const Tag& typ, void* pOwner, const Tag& otag, const std::string& comment, long flag) = 0;
  virtual StatusCode inspectByValue(IValue* pObj,   const Tag& typ, void* pOwner, const Tag& oTag, const std::string& comment) = 0;
  virtual StatusCode inspectContByRef(const void* pObj, const Tag& tag, const Tag& rtag, const Tag& vtag, const void* pOwner, const Tag& otag, const std::string& comment, long flags) = 0;
  virtual StatusCode inspectContByValue(IValue* pObj, const Tag& tag, const Tag& rtag, const Tag& vtag, const void* pOwner, const Tag& otag, const std::string& comment) = 0;

public:
  // User interface of the IInspector interface
  template < class T, class O >
  StatusCode inspectByRef(const T* pObj, const O* pOwner, const std::string& comment, long flag=Mutable) {
    return inspectByRef(pObj, _TT<T>(), (void*)pOwner, _TT<O>(), comment, flag);
  }
  template < class T, class O >
  StatusCode inspectByValue(const T& obj, const O* pOwner, const std::string& comment) {
    return inspectByValue(new _V<T>(obj), _TT<T>(), (void*)pOwner, _TT<O>(), comment);
  }
  template < class T, class O >
  StatusCode inspectContByRef( const T* pObj, const O* pOwner, const std::string& comment, long flag=Mutable) {
    typedef typename T::value_type                 _VVV;
    typedef typename T::value_type                 _TTT;
    // Unfortunately this is not implemented on G++:
    // typedef typename T::allocator_type::value_type _TTT;
    return inspectContByRef((void*)pObj, _TT<T>(), _TT<_VVV>(), _TT<_TTT>(), (void*)pOwner, _TT<O>(), comment, flag);
  }
  template < class T, class O >
  StatusCode inspectContByValue( const T& obj, const O* pOwner, const std::string& comment)    {
    typedef typename T::value_type                 _VVV;
    typedef typename T::value_type                 _TTT;
    // Unfortunately this is not implemented on G++:
    // typedef typename T::allocator_type::value_type _TTT;
    return inspectContByValue(new _V<T>(obj), _TT<T>(), _TT<_VVV>(), _TT<_TTT>(), (void*)pOwner, _TT<O>(), comment);
  }
};
#endif // GAUDIKERNEL_IINSPECTOR_H