mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Samuel Susla
5fa6c5a941
Summary: changelog: [internal] You can read more about this rule on https://clang.llvm.org/extra/clang-tidy/checks/modernize-pass-by-value.html # Isn't it wasteful to copy? Isn't reference more efficient? This rule of thumb is no longer true since C++11 with move semantics. Let's look at some examples. # Option one ``` class TextHolder { public: TextBox(std::string const &text) : text_(text) {} private: std::string text_; }; ``` By using reference here, we prevent the caller from using rvalue to and avoiding copy. Regardless of what the caller passes in, copy always happens. # Option two ``` class TextHolder { public: TextBox(std::string const &text) : text_(text) {} TextBox(std::string &&text) : text_(std::move(text)) {} private: std::string text_; }; ``` Here, we provide two constructors, one for const reference and one for rvalue reference. This gives the caller option to avoid copy. But now we have two constructors, which is not ideal. # Option three (what we do in this diff) ``` class TextHolder { public: TextBox(std::string text) : text_(std::move(text)) {} private: std::string text_; }; ``` Here, the caller has option to avoid copy and we only have single constructor. Reviewed By: fkgozali, JoshuaGross Differential Revision: D33276841 fbshipit-source-id: 619d5123d2e28937b22874650366629f24f20a63
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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#include "SynchronousEventBeat.h"
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#include <react/debug/react_native_assert.h>
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#include <utility>
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namespace facebook {
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namespace react {
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SynchronousEventBeat::SynchronousEventBeat(
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RunLoopObserver::Unique uiRunLoopObserver,
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RuntimeExecutor runtimeExecutor,
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std::shared_ptr<RuntimeScheduler> runtimeScheduler)
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: EventBeat({}),
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uiRunLoopObserver_(std::move(uiRunLoopObserver)),
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runtimeExecutor_(std::move(runtimeExecutor)),
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runtimeScheduler_(std::move(runtimeScheduler)) {
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uiRunLoopObserver_->setDelegate(this);
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uiRunLoopObserver_->enable();
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}
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void SynchronousEventBeat::activityDidChange(
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RunLoopObserver::Delegate const *delegate,
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RunLoopObserver::Activity activity) const noexcept {
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react_native_assert(delegate == this);
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lockExecutorAndBeat();
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}
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void SynchronousEventBeat::induce() const {
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if (!this->isRequested_) {
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return;
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}
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if (uiRunLoopObserver_->isOnRunLoopThread()) {
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this->lockExecutorAndBeat();
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}
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}
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void SynchronousEventBeat::lockExecutorAndBeat() const {
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if (!this->isRequested_) {
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return;
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}
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if (runtimeScheduler_) {
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runtimeScheduler_->executeNowOnTheSameThread(
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[this](jsi::Runtime &runtime) { beat(runtime); });
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} else {
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executeSynchronouslyOnSameThread_CAN_DEADLOCK(
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runtimeExecutor_, [this](jsi::Runtime &runtime) { beat(runtime); });
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}
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}
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} // namespace react
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} // namespace facebook
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