mirror of
https://github.com/OPM/ResInsight.git
synced 2026-08-27 05:37:21 -05:00
Magne Sjaastad
cff1ab08c4
Introduce RiaStringPool for efficient shared string storage and retrieval by index, with thread-safe access using shared mutex. Pre-allocate empty string at index 0. Add comprehensive unit tests covering core functionality, concurrency, edge cases, and realistic usage.
58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
/////////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2026 Equinor ASA
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//
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// ResInsight is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.
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//
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// See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
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// for more details.
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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 <shared_mutex>
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#include <string>
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#include <unordered_map>
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#include <vector>
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//==================================================================================================
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/// String pool for memory-efficient storage of shared strings
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/// Stores strings once and returns indices for lookups
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//==================================================================================================
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class RiaStringPool
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{
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public:
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using IndexType = uint32_t;
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static constexpr IndexType INVALID_INDEX = static_cast<IndexType>( -1 );
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static RiaStringPool& instance();
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// Get or create an index for a string
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IndexType getIndex( const std::string& str );
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// Get string by index
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const std::string& getString( IndexType index ) const;
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// Get empty string index
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IndexType getEmptyIndex() const { return m_emptyIndex; }
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private:
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RiaStringPool();
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RiaStringPool( const RiaStringPool& ) = delete;
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RiaStringPool& operator=( const RiaStringPool& ) = delete;
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mutable std::shared_mutex m_mutex;
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std::vector<std::string> m_strings;
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std::unordered_map<std::string, IndexType> m_stringToIndex;
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IndexType m_emptyIndex;
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};
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