source: Daodan/MSYS2/mingw32/i686-w64-mingw32/include/mspenum.h

/**
 * This file has no copyright assigned and is placed in the Public Domain.
 * This file is part of the mingw-w64 runtime package.
 * No warranty is given; refer to the file DISCLAIMER.PD within this package.
 */
#ifndef _MSPENUM_H_
#define _MSPENUM_H_

#ifdef __cplusplus

template <class Base,const IID *piid,class T,class Copy,class ThreadModel = CComObjectThreadModel>
class ATL_NO_VTABLE CSafeComEnum : public CComEnumImpl<Base,piid,T,Copy>,public CComObjectRootEx< ThreadModel >
{
  typedef CSafeComEnum<Base,piid,T,Copy,ThreadModel> ThisClass;
  typedef CComEnumImpl<Base,piid,T,Copy> BaseClass;
  STDMETHOD(Next)(ULONG celt,T *rgelt,ULONG *pceltFetched) {
    if(IsBadWritePtr(rgelt,celt *sizeof(T))) return E_POINTER;
    if((pceltFetched!=NULL) && IsBadWritePtr(pceltFetched,sizeof(ULONG))) return E_POINTER;
    return BaseClass::Next(celt,rgelt,pceltFetched);
  }
  STDMETHOD(Clone)(Base **ppEnum) {
    if(IsBadWritePtr(ppEnum,sizeof(Base *))) return E_POINTER;
    return BaseClass::Clone(ppEnum);
  }
  BEGIN_COM_MAP(ThisClass)
    COM_INTERFACE_ENTRY_IID(*piid,BaseClass)
    COM_INTERFACE_ENTRY_AGGREGATE(IID_IMarshal,m_pFTM)
  END_COM_MAP()
  DECLARE_GET_CONTROLLING_UNKNOWN()
  HRESULT Init(T *begin,T *end,IUnknown *pUnk,CComEnumFlags flags = AtlFlagNoCopy) {
    HRESULT hr;
    IUnknown *pIU = GetControllingUnknown();
    hr = CoCreateFreeThreadedMarshaler(pIU,& m_pFTM);
    if(FAILED(hr)) return hr;
    return BaseClass::Init(begin,end,pUnk,flags);
  }
  CSafeComEnum() { m_pFTM = NULL; }
  void FinalRelease(void) {
    if(m_pFTM) {
      m_pFTM->Release();
    }
    CComObjectRootEx< ThreadModel >::FinalRelease();
  }
protected:
  IUnknown *m_pFTM;
};

#endif /* __cplusplus */

#endif