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
44 lines
831 B
C++
44 lines
831 B
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 "EventBeat.h"
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#include <utility>
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namespace facebook {
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namespace react {
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EventBeat::EventBeat(SharedOwnerBox ownerBox)
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: ownerBox_(std::move(ownerBox)) {}
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void EventBeat::request() const {
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isRequested_ = true;
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}
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void EventBeat::beat(jsi::Runtime &runtime) const {
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if (!this->isRequested_) {
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return;
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}
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isRequested_ = false;
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if (beatCallback_) {
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beatCallback_(runtime);
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}
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}
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void EventBeat::induce() const {
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// Default implementation does nothing.
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}
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void EventBeat::setBeatCallback(BeatCallback beatCallback) {
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beatCallback_ = std::move(beatCallback);
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}
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} // namespace react
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} // namespace facebook
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