ClickHouse/dbms/include/DB/Storages/StoragePtr.h
2013-11-16 15:57:00 +00:00

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#pragma once
#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>
#include <boost/scoped_ptr.hpp>
#include <DB/Core/Exception.h>
namespace DB
{
class IStorage;
class StoragePtr
{
private:
/// Содержит IStorage. В деструкторе при необходимости вызывает IStorage::dropImpl() перед уничтожением IStorage.
struct Wrapper
{
Wrapper();
Wrapper(IStorage * s);
boost::scoped_ptr<IStorage> storage;
~Wrapper();
};
StoragePtr(boost::weak_ptr<Wrapper> p) : ptr(p) {}
boost::shared_ptr<Wrapper> ptr;
friend class IStorage;
public:
StoragePtr() {}
StoragePtr(const StoragePtr & p) : ptr(p.ptr) {}
StoragePtr& operator= (const StoragePtr & p)
{
ptr = p.ptr;
return *this;
}
IStorage* get() const
{
if (ptr == NULL)
return NULL;
else
return ptr->storage.get();
}
bool operator== (const IStorage * p) const
{
return get() == p;
}
IStorage* operator-> () const
{
return get();
}
IStorage& operator* () const
{
return *get();
}
operator IStorage*() const
{
return get();
}
operator bool() const
{
return bool(ptr);
}
bool operator! () const
{
return !bool(ptr);
}
};
}