TPyReturn.h

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// Author: Enric Tejedor CERN  08/2019
// Original PyROOT code by Wim Lavrijsen, LBL
//
// /*************************************************************************
//  * Copyright (C) 1995-2019, Rene Brun and Fons Rademakers.               *
//  * All rights reserved.                                                  *
//  *                                                                       *
//  * For the licensing terms see $ROOTSYS/LICENSE.                         *
//  * For the list of contributors see $ROOTSYS/README/CREDITS.             *
//  *************************************************************************/
 
#ifndef ROOT_TPyReturn
#define ROOT_TPyReturn
 
// ROOT
#include "Rtypes.h"
 
// Python
struct _object;
typedef _object PyObject;
 
/// Morphing return type from evaluating python expressions. 
class TPyReturn {
public:
   TPyReturn();
   TPyReturn(PyObject *pyobject);
   TPyReturn(const TPyReturn &);
   TPyReturn &operator=(const TPyReturn &);
   virtual ~TPyReturn();
 
   // conversions to standard types, may fail if unconvertible
   operator char *() const;
   operator const char *() const;
   operator Char_t() const;
 
   operator Long_t() const;
   operator Int_t() const { return (Int_t) operator Long_t(); }
   operator Short_t() const { return (Short_t) operator Long_t(); }
 
   operator ULong_t() const;
   operator UInt_t() const { return (UInt_t) operator ULong_t(); }
   operator UShort_t() const { return (UShort_t) operator ULong_t(); }
 
   operator Double_t() const;
   operator Float_t() const { return (Float_t) operator Double_t(); }
 
   // used for both TObject and PyObject conversions
   operator void *() const;
 
   template <class T>
   operator T *() const
   {
      return (T *)(void *)*this;
   }
 
   // used strictly for PyObject conversions
   operator PyObject *() const;
 
   ClassDef(TPyReturn, 1) // Python morphing return object
 
private:
   PyObject *fPyObject; ///<! actual python object
};
 
#endif