48 lines
2.2 KiB
C
48 lines
2.2 KiB
C
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/*------------------------------------------------------------------------------*
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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 <cstdint>
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#include <optional>
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#include <storage/page.h>
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namespace beedb::index
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{
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/**
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* Interface for unique indices.
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* The index can store only one value per key.
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*/
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class UniqueIndexInterface
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{
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public:
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UniqueIndexInterface() = default;
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virtual ~UniqueIndexInterface() = default;
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/**
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* Lookup for a value for a given key.
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*
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* @param key Key to lookup.
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* @return The stored value or an empty optional.
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*/
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[[nodiscard]] virtual std::optional<storage::Page::id_t> get(const std::int64_t key) const = 0;
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};
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} // namespace beedb::index
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