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attachments.h
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Tue, Jul 7, 7:43 AM
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text/x-c++
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Thu, Jul 9, 7:43 AM (17 h, 15 m)
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rXR Xreate
attachments.h
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//
// Created by pgess on 3/15/15.
//
#ifndef _XREATE_ATTACHMENTS_H_
#define _XREATE_ATTACHMENTS_H_
#include <map>
#include <assert.h>
#include <type_traits>
namespace xreate
{
//Attachments dictionary
template<class Tag>
struct AttachmentsDict
{
// typedef void Data;
// static const unsigned int key (current unreserved - 6);
};
template<class T>
struct AttachmentsStorage
{
//static Attachments* get(const T&);
};
namespace detail {
template<class Typ>
typename std::enable_if<std::is_pointer<Typ>::value, void*>::type
__wrap(const Typ& value){
return value;
}
template<class Typ>
typename std::enable_if<std::is_pointer<Typ>::value, Typ>::type
__unwrap(void* value){
return reinterpret_cast<Typ>(value);
}
template<class Typ>
typename std::enable_if<! std::is_pointer<Typ>::value, void*>::type
__wrap(const Typ& value){
Typ* holder = new Typ(value);
return holder;
}
template<class Typ>
typename std::enable_if<! std::is_pointer<Typ>::value, Typ&>::type
__unwrap(void* value){
return *reinterpret_cast<Typ*>(value);
}
template<class Typ>
typename std::enable_if<std::is_pointer<Typ>::value, void>::type
__delete(void* value){
delete reinterpret_cast<Typ>(value);
}
template<class Typ>
typename std::enable_if<! std::is_pointer<Typ>::value, void>::type
__delete(void* value){
delete reinterpret_cast<Typ*>(value);
}
}
//TODO copy whole data from symbol to symbol: copy(sTo, sFrom);
class Attachments
{
public:
//TODO add specialization for pointers
template<class Tag>
using Data = typename AttachmentsDict<Tag>::Data;
template<class Holder, class Tag>
static void put(const Holder& holder, const Data<Tag>& data)
{
const unsigned int key = AttachmentsDict<Tag>::key;
Attachments* self = AttachmentsStorage<Holder>::get(holder);
void* dataWaste = self->put(key, detail::__wrap(data));
detail::__delete<Data<Tag>>(dataWaste);
}
template<class Holder, class Tag>
static Data<Tag>& get(const Holder& holder)
{
const unsigned int key = AttachmentsDict<Tag>::key;
Attachments* self = AttachmentsStorage<Holder>::get(holder);
return detail::__unwrap<Data<Tag>>(self->get(key));
}
template<class Holder, class Tag>
static Data<Tag> get(const Holder& holder, Data<Tag>&& dataDefault)
{
if (! exists<Holder, Tag>(holder)){
return dataDefault;
}
const unsigned int key = AttachmentsDict<Tag>::key;
Attachments* self = AttachmentsStorage<Holder>::get(holder);
return detail::__unwrap<Data<Tag>>(self->get(key));
}
template<class Holder, class Tag>
static bool exists(const Holder& holder)
{
const unsigned int key = AttachmentsDict<Tag>::key;
Attachments* self = AttachmentsStorage<Holder>::get(holder);
return self->exists(key);
}
private:
std::map<unsigned int, void*> __data;
void* put(unsigned int key, void *data);
void* get(unsigned int key);
bool exists(unsigned int key);
};
}
#endif //_XREATE_ATTACHMENTS_H_
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