added Loop::walk

src/uvw/handle.hpp

@@ -22,7 +22,11 @@ template<> struct HandleType<uv_tcp_t> { };
 
 
 template<typename T>
-class Handle: public Emitter<T>, public std::enable_shared_from_this<T> {
+class Handle
+        : public BaseHandle,
+          public Emitter<T>,
+          public std::enable_shared_from_this<T>
+{
     struct BaseWrapper {
         virtual ~BaseWrapper() = default;
         virtual void * get() const noexcept = 0;
@@ -93,14 +97,14 @@ public:
 
     Loop& loop() const noexcept { return *pLoop; }
 
-    bool active() const noexcept { return !(uv_is_active(get<uv_handle_t>()) == 0); }
-    bool closing() const noexcept { return !(uv_is_closing(get<uv_handle_t>()) == 0); }
+    bool active() const noexcept override { return !(uv_is_active(get<uv_handle_t>()) == 0); }
+    bool closing() const noexcept override { return !(uv_is_closing(get<uv_handle_t>()) == 0); }
 
-    void reference() noexcept { uv_ref(get<uv_handle_t>()); }
-    void unreference() noexcept { uv_unref(get<uv_handle_t>()); }
-    bool referenced() const noexcept { return !(uv_has_ref(get<uv_handle_t>()) == 0); }
+    void reference() noexcept override { uv_ref(get<uv_handle_t>()); }
+    void unreference() noexcept override { uv_unref(get<uv_handle_t>()); }
+    bool referenced() const noexcept override { return !(uv_has_ref(get<uv_handle_t>()) == 0); }
 
-    void close() noexcept {
+    void close() noexcept override {
         if(!closing()) {
             uv_close(get<uv_handle_t>(), &Handle<T>::closeCallback);
         }

src/uvw/loop.hpp

@@ -13,6 +13,17 @@
 namespace uvw {
 
 
+class BaseHandle {
+public:
+    virtual bool active() const noexcept = 0;
+    virtual bool closing() const noexcept = 0;
+    virtual void reference() noexcept = 0;
+    virtual void unreference() noexcept = 0;
+    virtual bool referenced() const noexcept = 0;
+    virtual void close() noexcept = 0;
+};
+
+
 class Loop final: public Emitter<Loop>, public std::enable_shared_from_this<Loop> {
     template<typename>
     friend class Handle;
@@ -96,6 +107,16 @@ public:
         uv_stop(loop.get());
     }
 
+    void walk(std::function<void(BaseHandle &)> callback) noexcept {
+        // remember: non-capturing lambdas decay to pointers to functions
+        uv_walk(loop.get(), [](uv_handle_t *handle, void *func) {
+            BaseHandle &ref = *static_cast<BaseHandle*>(handle->data);
+            std::function<void(BaseHandle &)> &f =
+                    *static_cast<std::function<void(BaseHandle &)>*>(func);
+            f(ref);
+        }, &callback);
+    }
+
 private:
     std::unique_ptr<uv_loop_t, Deleter> loop;
 };

test/main.cpp

@@ -43,6 +43,9 @@ void listen(uvw::Loop &loop) {
 
         client->on<uvw::EndEvent>([](const uvw::EndEvent &, uvw::Tcp &client) {
             std::cout << "end" << std::endl;
+            int count = 0;
+            client.loop().walk([&count](uvw::BaseHandle &handle) { ++count; });
+            std::cout << "still alive: " << count << " handles" << std::endl;
             client.close();
         });