criteria progress

include/matador/object/collection.hpp

@@ -40,12 +40,12 @@ public:
     return proxy_->items_.empty();
   }
 
-  void reset(std::shared_ptr<collection_proxy<typename Type::value_type>> proxy) {
+  void reset(std::shared_ptr<collection_proxy<Type>> proxy) {
     proxy_ = std::move(proxy);
   }
 
 private:
-  std::shared_ptr<collection_proxy<typename Type::value_type>> proxy_;
+  std::shared_ptr<collection_proxy<Type>> proxy_;
 };
 
 }