91 lines
3.3 KiB
C++
91 lines
3.3 KiB
C++
/*------------------------------------------------------------------------------*
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* Architecture & Implementation of DBMS *
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*------------------------------------------------------------------------------*
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* Copyright 2022 Databases and Information Systems Group TU Dortmund *
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* Visit us at *
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* http://dbis.cs.tu-dortmund.de/cms/en/home/ *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR *
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, *
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR *
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* OTHER DEALINGS IN THE SOFTWARE. *
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* *
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* Authors: *
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* Maximilian Berens <maximilian.berens@tu-dortmund.de> *
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* Roland Kühn <roland.kuehn@cs.tu-dortmund.de> *
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* Jan Mühlig <jan.muehlig@tu-dortmund.de> *
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*------------------------------------------------------------------------------*
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*/
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#pragma once
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#include "page.h"
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namespace beedb::storage
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{
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class RecordIdentifier
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{
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public:
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static_assert(sizeof(Page::id_t) + sizeof(std::uint16_t) <= sizeof(std::uint64_t));
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RecordIdentifier() = default;
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RecordIdentifier(const RecordIdentifier &) = default;
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RecordIdentifier(Page::id_t page_id, std::uint16_t slot)
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{
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this->page_id(page_id);
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this->slot(slot);
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}
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~RecordIdentifier() = default;
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[[nodiscard]] Page::id_t page_id() const
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{
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return _identifier >> (sizeof(std::uint16_t) * 8);
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}
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[[nodiscard]] std::uint16_t slot() const
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{
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return _identifier & std::numeric_limits<std::uint16_t>::max();
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}
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void page_id(Page::id_t page_id)
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{
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_identifier = (std::uint64_t(page_id) << (sizeof(Page::offset_t) * 8) | std::uint64_t(this->slot()));
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}
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void slot(const Page::offset_t offset)
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{
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_identifier = (std::uint64_t(this->page_id()) << (sizeof(std::uint16_t) * 8)) | offset;
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}
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explicit operator bool() const
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{
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return _identifier < std::numeric_limits<decltype(_identifier)>::max();
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}
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explicit operator std::uint64_t() const
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{
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return _identifier;
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}
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bool operator==(const RecordIdentifier other) const
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{
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return _identifier == other._identifier;
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}
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private:
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std::uint64_t _identifier = std::numeric_limits<decltype(_identifier)>::max();
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};
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} // namespace beedb::storage
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namespace std
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{
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template <> struct hash<beedb::storage::RecordIdentifier>
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{
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public:
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std::size_t operator()(const beedb::storage::RecordIdentifier &rid) const
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{
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return std::hash<std::uint64_t>()(static_cast<std::uint64_t>(rid));
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}
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};
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} // namespace std
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