VariantAdapt.h

#pragma once

template <typename T>
struct _CopyVariantFromAdaptItf
{
  static HRESULT copy(VARIANT* p1, const CAdapt< CComPtr<T> >* p2)
  {
    HRESULT hr = p2->m_T->QueryInterface(
      IID_IDispatch,
      (void**)&p1->pdispVal
      );
    if (SUCCEEDED(hr))
    {
      p1->vt = VT_DISPATCH;
    }
    else
    {
      hr = p2->m_T->QueryInterface(
        IID_IUnknown,
        (void**)&p1->punkVal
        );
      if( SUCCEEDED(hr) )
      {
        p1->vt = VT_UNKNOWN;
      }
    }

    return hr;
  }

  static void init(VARIANT* p) { VariantInit(p); }
  static void destroy(VARIANT* p) { VariantClear(p); }
};

template <typename T>
struct _CopyItfFromAdaptItf
{
	static HRESULT copy(T** p1, const CAdapt< CComPtr<T> >* p2)
	{
		*p1 = p2->m_T;
		if(*p1)
		{
			return (*p1)->AddRef(), S_OK;
		}
		
		return E_POINTER;
	}

	static void init(T** p) {}
	static void destroy(T** p) { if( *p ) (*p)->Release(); }
};