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

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2016-05-20 22:48:43 +02:00
/** \file
* _NewEnum style COM enumerator backed by a smart pointer to items.
*/
/*
* Copyright <EFBFBD> 2010 Alexander Lamaison
*
* 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_SMART_ENUM_H
#define COMET_SMART_ENUM_H
#include <comet/config.h>
#include <comet/enum_common.h>
#include <comet/server.h>
namespace comet {
namespace impl {
template<typename SmartPtr>
class smart_enum_source
{
public:
typedef typename SmartPtr::element_type::const_iterator
const_iterator;
explicit smart_enum_source(SmartPtr source)
: source_(source), it_(begin()) {}
const_iterator begin()
{
return source_->begin();
}
const_iterator end()
{
return source_->end();
}
const_iterator& current()
{
return it_;
}
private:
SmartPtr source_;
const_iterator it_;
};
}
/**
* Implements _NewEnum style COM object on top of smart pointer to
* a collection.
* \param Itf Enumeration Interface.
* \param C STL Style container.
* \param T Iteration Element type
* \param CONVERTER Converts container element to \p T type. (std::identity<C::value_type>)
* \sa stl_enumeration create_enum
*/
template<
typename Itf, typename SmartPtr, typename T,
typename CONVERTER=std::identity<
COMET_STRICT_TYPENAME SmartPtr::element_type::value_type> >
class smart_enumeration :
public impl::enumeration<
Itf, T, CONVERTER, impl::smart_enum_source<SmartPtr> >
{
public:
smart_enumeration(
SmartPtr container, const CONVERTER& converter=CONVERTER())
: enumeration(
impl::smart_enum_source<SmartPtr>(container), converter) {}
private:
smart_enumeration(const smart_enumeration&);
smart_enumeration& operator=(const smart_enumeration&);
};
/**
* Smart Enumeration creation helper.
*
* Creates the enumeration with the element type specified by the
* enumerated_type_of policy. To specify the element type explicitly, use
* smart_enumeration directly.
*
* \tparam ET Enumeration Type e.g. IEnumUnknown.
* \tparam SmartPtr Smart pointer (inferred from @a container parameter).
*
* \param container Smart pointer to an STL collection
* e.g. auto_ptr<vector>.
*/
template<typename ET, typename SmartPtr>
inline com_ptr<ET> make_smart_enumeration(SmartPtr container)
{
typedef typename enumerated_type_of<ET>::is T;
typedef std::identity<
COMET_STRICT_TYPENAME SmartPtr::element_type::value_type>
CONVERTER;
return new smart_enumeration<ET, SmartPtr, T, CONVERTER>(container);
}
/**
* Smart Enumeration creation helper with custom converter.
*
* Creates the enumeration with the element type specified by the
* enumerated_type_of policy. To specify the element type explicitly, use
* smart_enumeration directly.
*
* \tparam ET Enumeration Type e.g. IEnumUnknown.
* \tparam SmartPtr Smart pointer (inferred from @a container parameter).
* \tparam CONVERTER Converter type (inferred from @a converter).
*
* \param container Smart pointer to an STL collection
* e.g. auto_ptr<vector>.
* \param converter Custom converter.
*/
template<typename ET, typename SmartPtr, typename CONVERTER>
inline com_ptr<ET> make_smart_enumeration(
SmartPtr container, const CONVERTER& converter)
{
typedef typename enumerated_type_of<ET>::is T;
return new smart_enumeration<ET, SmartPtr, T, CONVERTER>(
container, converter);
}
}
#endif