sustaining_gazes/lib/local/CamCom/comet/enum_common.h

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2016-05-20 22:48:43 +02:00
/** \file
* Code common to enumerator implementations.
*/
/*
* Copyright <EFBFBD> 2000 Sofus Mortensen
*
* This material is provided "as is", with absolutely no warranty
* expressed or implied. Any use is at your own risk. Permission to
* use or copy this software for any purpose is hereby granted without
* fee, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is
* granted, provided the above notices are retained, and a notice that
* the code was modified is included with the above copyright notice.
*
* This header is part of Comet version 2.
* https://github.com/alamaison/comet
*/
#ifndef COMET_ENUM_IMPL_H
#define COMET_ENUM_IMPL_H
#include <comet/config.h>
#include <comet/server.h>
#include <comet/stl.h>
#include <comet/variant.h>
namespace comet {
namespace impl {
template<typename T> struct type_policy;
template<> struct type_policy<VARIANT>
{
template<typename S>
static void init(VARIANT& t, const S& s)
{ ::VariantInit(&t); t = variant_t::detach( variant_t(s) ); }
static void clear(VARIANT& t) { ::VariantClear(&t); }
};
template<> struct type_policy<CONNECTDATA>
{
template<typename S>
static void init(CONNECTDATA& t, const S& s)
{
t.dwCookie = s.first;
t.pUnk =
com_ptr<IUnknown>::detach(com_ptr<IUnknown>(s.second));
}
static void clear(CONNECTDATA& t) { t.pUnk->Release(); }
};
template<
typename Itf, typename T, typename CONVERTER, typename Source>
class enumeration : public simple_object<Itf>
{
typedef type_policy<T> policy;
public:
/// \name Interface \p Itf
//@{
STDMETHOD(Next)(ULONG celt, T *rgelt, ULONG* pceltFetched)
{
if (pceltFetched)
*pceltFetched = 0;
if (!rgelt)
return E_POINTER;
UINT i = 0;
typename Source::const_iterator backup_it_ = source_.current();
try
{
while (i < celt && source_.current() != source_.end())
{
policy::init(rgelt[i], converter_(*source_.current()));
++i;
++source_.current();
}
if (pceltFetched)
*pceltFetched = i;
}
catch (...)
{
source_.current() = backup_it_;
for (size_t j = 0; j <= i; ++j)
policy::clear(rgelt[j]);
return E_FAIL;
}
return i == celt ? S_OK : S_FALSE;
}
STDMETHOD(Reset)()
{
try
{
source_.current() = source_.begin();
}
catch (...) { return E_FAIL; }
return S_OK;
}
STDMETHOD(Skip)(ULONG celt)
{
try
{
while (celt--) source_.current()++;
}
catch (...) { return E_FAIL; }
return S_OK;
}
STDMETHOD(Clone)(Itf** ppenum)
{
try
{
enumeration* new_enum =
new enumeration(source_, converter_);
new_enum->AddRef();
*ppenum = new_enum;
}
catch (...) { return E_FAIL; }
return S_OK;
}
//@}
enumeration(
typename Source source, const CONVERTER& converter)
: source_(source), converter_(converter) {}
Source source_;
CONVERTER converter_;
private:
enumeration(const enumeration&);
enumeration& operator=(const enumeration&);
};
}
/** \struct enumerated_type_of enum.h comet/enum.h
* Traits wrapper mapping COM Enumeration interface to element.
*/
template<typename EnumItf> struct enumerated_type_of;
template<> struct enumerated_type_of<IEnumVARIANT>
{ typedef VARIANT is; };
template<> struct enumerated_type_of<IEnumConnectionPoints>
{ typedef IConnectionPoint* is; };
template<> struct enumerated_type_of<IEnumConnections>
{ typedef CONNECTDATA is; };
/** \struct ptr_converter enum.h comet/enum.h
* IUnknown Converter for containers containing Comet objects.
* \relates stl_enumeration
*/
template<typename T> struct ptr_converter : std::unary_function< com_ptr<IUnknown>, T>
{
com_ptr<IUnknown> operator()(const T& x) { return impl::cast_to_unknown(x); }
};
/** \struct ptr_converter_select1st enum.h comet/enum.h
* IUnknown Converter for containers containing Comet objects as the first
* elment of a pair.
* \relates stl_enumeration
*/
template<typename T> struct ptr_converter_select1st : std::unary_function< com_ptr<IUnknown>, T>
{
com_ptr<IUnknown> operator()(const T& x) { return impl::cast_to_unknown(x.first); }
};
/** \struct ptr_converter_select2nd enum.h comet/enum.h
* IUnknown Converter for containers containing Comet objects as the second
* elment of a pair.
* \relates stl_enumeration
*/
template<typename T> struct ptr_converter_select2nd : std::unary_function< com_ptr<IUnknown>, T>
{
com_ptr<IUnknown> operator()(const T& x) { return impl::cast_to_unknown(x.second); }
};
}
#endif