#ifndef DataFormats_Common_ConstPtrCache_h
#define DataFormats_Common_ConstPtrCache_h
// -*- C++ -*-
//
// Package:     Common
// Class  :     PtrCache
//
/**\class ConstPtrCache ConstPtrCache.h DataFormats/Common/interface/ConstPtrCache.h

 Description: ROOT safe cache of a pointer

 Usage:
We define schema evolution rules for this class in order to guarantee that ptr_
is always reset to 0 when ever a new instance of this class is read from a file

*/
//
// Original Author:  Chris Jones
//         Created:  Sat Aug 18 17:30:04 EDT 2007
//

// system include files

// user include files

// forward declarations
namespace edm {
  class ConstPtrCache {
  public:
    ConstPtrCache() : ptr_(0) {}
    ConstPtrCache(const void* iPtr) : ptr_(iPtr) {}

    const void* ptr_;
  };

}  // namespace edm
#endif
