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// This is a part of the Active Template Library.
// Copyright (C) 1995-1999 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Active Template Library Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Active Template Library product.
// VCUE_Copy.h
//
// This file contains ATL-style copy policy classes
// ATL uses copy policy classes in its enumerator and collection interface implementations
//
//////////////////////////////////////////////////////////////////////
#if !defined(_GENERICCOPY_H___36A49827_B15B_11D2_BA63_00C04F8EC847___INCLUDED_)
#define _GENERICCOPY_H___36A49827_B15B_11D2_BA63_00C04F8EC847___INCLUDED_
#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000
#include <AtlCom.h>
namespace VCUE
{
template <class DestinationType, class SourceType = DestinationType>
class GenericCopy
{
public :
typedef DestinationType destination_type;
typedef SourceType source_type;
static void init(destination_type* p)
{
_Copy<destination_type>::init(p);
}
static void destroy(destination_type* p)
{
_Copy<destination_type>::destroy(p);
}
static HRESULT copy(destination_type* pTo, const source_type* pFrom)
{
return _Copy<destination_type>::copy(pTo, const_cast<source_type*>(pFrom));
}
}; // class GenericCopy
template <>
class GenericCopy<BSTR>
{
public :
typedef BSTR destination_type;
typedef BSTR source_type;
static void init(destination_type* p)
{
*p = NULL;
}
static void destroy(destination_type* p)
{
SysFreeString(*p);
*p = NULL;
}
static HRESULT copy(destination_type* pTo, const source_type* pFrom)
{
*pTo = SysAllocStringByteLen(reinterpret_cast<const char*>(*pFrom), SysStringByteLen(*pFrom));
if (*pTo)
return S_OK;
else
return E_OUTOFMEMORY;
}
}; // class GenericCopy<BSTR>
template <>
class GenericCopy<VARIANT, BSTR>
{
public :
typedef VARIANT destination_type;
typedef BSTR source_type;
static void init(destination_type* p)
{
GenericCopy<destination_type>::init(p);
}
static void destroy(destination_type* p)
{
GenericCopy<destination_type>::destroy(p);
}
static HRESULT copy(destination_type* pTo, const source_type* pFrom)
{
return CComVariant(*pFrom).Detach(pTo);
}
}; // class GenericCopy<VARIANT, BSTR>
template <>
class GenericCopy<BSTR, VARIANT>
{
public :
typedef BSTR destination_type;
typedef VARIANT source_type;
static void init(destination_type* p)
{
GenericCopy<destination_type>::init(p);
}
static void destroy(destination_type* p)
{
GenericCopy<destination_type>::destroy(p);
}
static HRESULT copy(destination_type* pTo, const source_type* pFrom)
{
VARIANT var = {0};
HRESULT hr = VariantChangeType(&var, const_cast<VARIANT*>(pFrom), 0, VT_BSTR);
if (FAILED(hr))
return hr;
*pTo = var.bstrVal;
return S_OK;
// We deliberately do not free the variant.
}
}; // class GenericCopy<BSTR, VARIANT>
template <class MapType, class DestinationType = MapType::referent_type>
class MapCopy
{
public :
typedef DestinationType destination_type;
typedef MapType::value_type source_type;
typedef MapType map_type;
typedef MapType::referent_type pseudosource_type;
static void init(destination_type* p)
{
GenericCopy<destination_type, pseudosource_type>::init(p);
}
static void destroy(destination_type* p)
{
GenericCopy<destination_type, pseudosource_type>::destroy(p);
}
static HRESULT copy(destination_type* pTo, const source_type* pFrom)
{
return GenericCopy<destination_type, pseudosource_type>::copy(pTo, &(pFrom->second));
}
}; // class MapCopy
}; // namespace VCUE
#endif // !defined(_GENERICCOPY_H___36A49827_B15B_11D2_BA63_00C04F8EC847___INCLUDED_)
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