HTTP server networking side, also, fix the releasing of channels in driver

luprex/core/cpp/util.hpp

@@ -221,11 +221,17 @@ double distance_squared(double x1, double y1, double x2, double y2);
 // Make a LuaSourceVec with one element, for unit testing.
 LuaSourcePtr make_lua_source(const eng::string &code);
 
-// Remove nullptrs from a vector of unique pointers.
+// Remove items from a vector that are nullptr.
 template<class T>
-void remove_nullptrs(eng::vector<std::unique_ptr<T>> &vec) {
-    std::unique_ptr<T> nullp;
-    auto iter = std::remove(vec.begin(), vec.end(), nullp);
+void remove_nullptrs(T &vec) {
+    auto iter = std::partition(vec.begin(), vec.end(), [] (const auto &x) { return x != nullptr; });
+    vec.erase(iter, vec.end());
+}
+
+// Remove items from a vector that are marked for deletion.
+template<class T>
+void remove_marked_items(T &vec) {
+    auto iter = std::partition(vec.begin(), vec.end(), [] (const auto &x) { return !x.marked_for_deletion(); });
     vec.erase(iter, vec.end());
 }