added Emitter::clearAll

src/uvw/emitter.hpp

@@ -20,6 +20,7 @@ class Emitter {
     struct BaseHandler {
         virtual ~BaseHandler() noexcept = default;
         virtual bool empty() const noexcept = 0;
+        virtual void clear() noexcept = 0;
     };
 
     template<typename E>
@@ -33,6 +34,11 @@ class Emitter {
             return onceL.empty() && onL.empty();
         }
 
+        void clear() noexcept override {
+            onceL.clear();
+            onL.clear();
+        }
+
         Connection once(Listener f) {
             auto conn = onceL.insert(onceL.cbegin(), std::move(f));
             return { onceL, std::move(conn) };
@@ -47,11 +53,6 @@ class Emitter {
             conn.first.erase(conn.second);
         }
 
-        void clear() noexcept {
-            onceL.clear();
-            onL.clear();
-        }
-
         void publish(const E &event, T &ref) {
             for(auto &&listener: onceL) { listener(event, ref); }
             for(auto &&listener: onL) { listener(event, ref); }
@@ -122,6 +123,12 @@ public:
         handler<E>().clear();
     }
 
+    void clearAll() noexcept {
+        for(auto &&h: handlers) {
+            h->clear();
+        }
+    }
+
     bool empty() const noexcept {
         bool empty = true;