src: remove user_data from TimerWrap

There’s no point in having an opaque user data pointer when we’re
already using `std::function`.

PR-URL: #34252
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: David Carlier <devnexen@gmail.com>

Author: addaleax

src/inspector_agent.cc

@@ -525,7 +525,7 @@ class NodeInspectorClient : public V8InspectorClient {
                            void* data) override {
     auto result =
         timers_.emplace(std::piecewise_construct, std::make_tuple(data),
-                        std::make_tuple(env_, callback, data));
+                        std::make_tuple(env_, [=]() { callback(data); }));
     CHECK(result.second);
     uint64_t interval = 1000 * interval_s;
     result.first->second.Update(interval, interval);

src/timer_wrap.cc

@@ -5,10 +5,9 @@
 
 namespace node {
 
-TimerWrap::TimerWrap(Environment* env, TimerCb fn, void* user_data)
+TimerWrap::TimerWrap(Environment* env, const TimerCb& fn)
     : env_(env),
-      fn_(fn),
-      user_data_(user_data) {
+      fn_(fn) {
   uv_timer_init(env->event_loop(), &timer_);
   timer_.data = this;
 }
@@ -45,14 +44,13 @@ void TimerWrap::Unref() {
 
 void TimerWrap::OnTimeout(uv_timer_t* timer) {
   TimerWrap* t = ContainerOf(&TimerWrap::timer_, timer);
-  t->fn_(t->user_data_);
+  t->fn_();
 }
 
 TimerWrapHandle::TimerWrapHandle(
     Environment* env,
-    TimerWrap::TimerCb fn,
-    void* user_data) {
-  timer_ = new TimerWrap(env, fn, user_data);
+    const TimerWrap::TimerCb& fn) {
+  timer_ = new TimerWrap(env, fn);
   env->AddCleanupHook(CleanupHook, this);
 }
 

src/timer_wrap.h

@@ -14,9 +14,9 @@ namespace node {
 // Utility class that makes working with libuv timers a bit easier.
 class TimerWrap final : public MemoryRetainer {
  public:
-  using TimerCb = std::function<void(void*)>;
+  using TimerCb = std::function<void()>;
 
-  TimerWrap(Environment* env, TimerCb fn, void* user_data);
+  TimerWrap(Environment* env, const TimerCb& fn);
   TimerWrap(const TimerWrap&) = delete;
 
   inline Environment* env() const { return env_; }
@@ -43,7 +43,6 @@ class TimerWrap final : public MemoryRetainer {
   Environment* env_;
   TimerCb fn_;
   uv_timer_t timer_;
-  void* user_data_ = nullptr;
 
   friend std::unique_ptr<TimerWrap>::deleter_type;
 };
@@ -52,8 +51,7 @@ class TimerWrapHandle : public MemoryRetainer  {
  public:
   TimerWrapHandle(
       Environment* env,
-      TimerWrap::TimerCb fn,
-      void* user_data = nullptr);
+      const TimerWrap::TimerCb& fn);
 
   TimerWrapHandle(const TimerWrapHandle&) = delete;