Clean up RuntimeScheduler's API

Summary:
Changelog: [internal]

Mark methods as noexcept and explicitly delete unwanted constructors.

Reviewed By: fkgozali

Differential Revision: D29085827

fbshipit-source-id: 872009113e2bd519ab3ae11879a15d15f780198f

ReactCommon/react/renderer/runtimescheduler/RuntimeScheduler.cpp

@@ -52,19 +52,19 @@ std::shared_ptr<Task> RuntimeScheduler::scheduleTask(
   return task;
 }
 
-bool RuntimeScheduler::getShouldYield() const {
+bool RuntimeScheduler::getShouldYield() const noexcept {
   return shouldYield_;
 }
 
-void RuntimeScheduler::cancelTask(const std::shared_ptr<Task> &task) {
+void RuntimeScheduler::cancelTask(const std::shared_ptr<Task> &task) noexcept {
   task->callback.reset();
 }
 
-SchedulerPriority RuntimeScheduler::getCurrentPriorityLevel() const {
+SchedulerPriority RuntimeScheduler::getCurrentPriorityLevel() const noexcept {
   return currentPriority_;
 }
 
-RuntimeSchedulerTimePoint RuntimeScheduler::now() const {
+RuntimeSchedulerTimePoint RuntimeScheduler::now() const noexcept {
   return now_();
 }
 

ReactCommon/react/renderer/runtimescheduler/RuntimeScheduler.h

@@ -22,6 +22,17 @@ class RuntimeScheduler final {
       RuntimeExecutor const &runtimeExecutor,
       std::function<RuntimeSchedulerTimePoint()> now =
           RuntimeSchedulerClock::now);
+  /*
+   * Not copyable.
+   */
+  RuntimeScheduler(RuntimeScheduler const &) = delete;
+  RuntimeScheduler &operator=(RuntimeScheduler const &) = delete;
+
+  /*
+   * Not movable.
+   */
+  RuntimeScheduler(RuntimeScheduler &&) = delete;
+  RuntimeScheduler &operator=(RuntimeScheduler &&) = delete;
 
   void scheduleWork(std::function<void(jsi::Runtime &)> callback) const;
 
@@ -39,13 +50,13 @@ class RuntimeScheduler final {
       SchedulerPriority priority,
       jsi::Function callback);
 
-  void cancelTask(std::shared_ptr<Task> const &task);
+  void cancelTask(std::shared_ptr<Task> const &task) noexcept;
 
-  bool getShouldYield() const;
+  bool getShouldYield() const noexcept;
 
-  SchedulerPriority getCurrentPriorityLevel() const;
+  SchedulerPriority getCurrentPriorityLevel() const noexcept;
 
-  RuntimeSchedulerTimePoint now() const;
+  RuntimeSchedulerTimePoint now() const noexcept;
 
   void setEnableYielding(bool enableYielding);