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/*************************************************************************
*
* Copyright 2016 Realm Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**************************************************************************/
#ifndef REALM_TABLE_REF_HPP
#define REALM_TABLE_REF_HPP
#include <cstddef>
#include <ostream>
namespace realm {
class Table;
class TableRef;
class ConstTableRef {
public:
ConstTableRef() noexcept {}
ConstTableRef(std::nullptr_t) noexcept {}
ConstTableRef(const TableRef& other) noexcept;
const Table* operator->() const;
const Table& operator*() const;
operator bool() const noexcept;
const Table* unchecked_ptr() const
{
return m_table;
}
bool operator==(const ConstTableRef& other) const
{
return m_table == other.m_table && m_instance_version == other.m_instance_version;
}
bool operator!=(const ConstTableRef& other) const
{
return !(*this == other);
}
bool operator<(const ConstTableRef& other) const
{
if (m_table == other.m_table)
return m_instance_version < other.m_instance_version;
else
return m_table < other.m_table;
}
bool operator>(const ConstTableRef& other) const
{
if (m_table == other.m_table)
return m_instance_version > other.m_instance_version;
else
return m_table > other.m_table;
}
std::ostream& print(std::ostream& o) const
{
return o << "TableRef(" << m_table << ", " << m_instance_version << ")";
}
TableRef cast_away_const() const;
static ConstTableRef unsafe_create(const Table* t_ptr);
void check() const;
protected:
explicit ConstTableRef(const Table* t_ptr, uint64_t instance_version)
: m_table(const_cast<Table*>(t_ptr))
, m_instance_version(instance_version)
{
}
friend class Group;
friend class Table;
friend class ClusterTree;
Table* m_table = nullptr;
uint64_t m_instance_version = 0;
};
class TableRef : public ConstTableRef {
public:
TableRef() noexcept
: ConstTableRef()
{
}
TableRef(std::nullptr_t) noexcept
: ConstTableRef()
{
}
Table* operator->() const;
Table& operator*() const;
Table* unchecked_ptr() const
{
return m_table;
}
static TableRef unsafe_create(Table* t_ptr);
private:
explicit TableRef(Table* t_ptr, uint64_t instance_version)
: ConstTableRef(t_ptr, instance_version)
{
}
friend class Group;
friend class Table;
friend class ClusterTree;
friend class ConstTableRef;
};
inline ConstTableRef::ConstTableRef(const TableRef& other) noexcept
: m_table(other.m_table)
, m_instance_version(other.m_instance_version)
{
}
inline TableRef ConstTableRef::cast_away_const() const
{
return TableRef(m_table, m_instance_version);
}
inline std::ostream& operator<<(std::ostream& o, const ConstTableRef& tr)
{
return tr.print(o);
}
} // namespace realm
#endif // REALM_TABLE_REF_HPP
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