mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin Shergin
df229590b2
Summary: This part of the codebase is very perf sensitive and designed to work without exceptions enabled. Most of the method was `noexcept` all the time, but some of those missing that by mistake. Reviewed By: sammy-SC Differential Revision: D17629426 fbshipit-source-id: b311e4b7eff8e2b7cf29518288480d3a812dda44
62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <better/small_vector.h>
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#include <react/core/RawPropsKey.h>
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#include <react/core/RawPropsPrimitives.h>
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namespace facebook {
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namespace react {
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/*
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* A map especially optimized to hold `{name: index}` relations.
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* The implementation is conceptually similar to a classic hash map with a hash
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* function that returns the length of the string.
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* The map is optimized for reads only (the map must be reindexed before a bunch
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* of reads).
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*/
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class RawPropsKeyMap final {
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public:
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/*
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* Stores `value` with by given `key`.
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*/
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void insert(RawPropsKey const &key, RawPropsValueIndex value) noexcept;
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/*
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* Reindexes the stored data.
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* Must be called before `at` (after calling a bunch of `add`s).
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*/
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void reindex() noexcept;
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/*
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* Finds and returns the `value` (some index) by given `key`.
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* Returns `kRawPropsValueIndexEmpty` if the value wan't found.
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*/
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RawPropsValueIndex at(
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char const *name,
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RawPropsPropNameLength length) noexcept;
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private:
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static int comparator(void const *lhs, void const *rhs) noexcept;
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struct Item {
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RawPropsValueIndex value;
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RawPropsPropNameLength length;
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char name[kPropNameLengthHardCap];
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};
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better::small_vector<Item, kNumberOfExplicitlySpecifedPropsSoftCap> items_{};
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better::small_vector<RawPropsPropNameLength, kPropNameLengthHardCap>
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buckets_{};
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};
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} // namespace react
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} // namespace facebook
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