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47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
#pragma once
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#include <cstdint>
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#include <vector>
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#include "posting_list.h"
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#define IS_COMPACT_POSTING(x) (((uintptr_t)x & 1))
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#define SET_COMPACT_POSTING(x) ((void*)((uintptr_t)x | 1))
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#define RAW_POSTING_PTR(x) ((void*)((uintptr_t)x & ~1))
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#define COMPACT_POSTING_PTR(x) ((compact_posting_list_t*)((uintptr_t)x & ~1))
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struct compact_posting_list_t {
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// structured to get 4 byte alignment for `id_offsets`
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uint8_t length = 0;
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uint8_t ids_length = 0;
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uint16_t capacity = 0;
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// format: num_offsets, offset1,..,offsetn, id1 | num_offsets, offset1,..,offsetn, id2
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uint32_t id_offsets[];
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static compact_posting_list_t* create(uint32_t num_ids, uint32_t* ids, const uint32_t* offset_index,
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uint32_t num_offsets, uint32_t* offsets);
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posting_list_t* to_full_posting_list();
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int64_t upsert(uint32_t id, const std::vector<uint32_t>& offsets);
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int64_t upsert(uint32_t id, const uint32_t* offsets, uint32_t num_offsets);
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void erase(uint32_t id);
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uint32_t last_id();
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uint32_t num_ids() const;
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};
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class posting_t {
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private:
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static constexpr size_t COMPACT_LIST_THRESHOLD_LENGTH = 64;
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public:
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static void upsert(void*& obj, uint32_t id, const std::vector<uint32_t>& offsets);
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static void erase(void*& obj, uint32_t id);
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static uint32_t num_ids(void*& obj);
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}; |