make nodes to provide nodes instead of mixins

include/ifaces/ILink.h

@@ -6,12 +6,14 @@
 template <class TElem>
 class ILink {
 public:
+	using ElemPtr = std::shared_ptr<TElem>;
+
 	virtual ~ILink() = default;
-	virtual std::shared_ptr<TElem> getNode() const = 0;
-	virtual std::shared_ptr<TElem> getParent() const = 0;
-	virtual void setParent(const std::shared_ptr<TElem>& parent) = 0;
-	virtual const std::vector<std::shared_ptr<TElem>>& getChildren() const = 0;
-	virtual void addChild(const std::shared_ptr<TElem>& child) = 0;
-	virtual void removeChild(const std::shared_ptr<TElem>& child) = 0;
-	virtual void replaceChild(const std::shared_ptr<TElem>& oldChild, const std::shared_ptr<TElem>& newChild) = 0;
+	virtual ElemPtr getNode() const = 0;
+	virtual ElemPtr getParent() const = 0;
+	virtual void setParent(const ElemPtr& parent) = 0;
+	virtual const std::vector<ElemPtr>& getChildren() const = 0;
+	virtual void addChild(const ElemPtr& child) = 0;
+	virtual void removeChild(const ElemPtr& child) = 0;
+	virtual void replaceChild(const ElemPtr& oldChild, const ElemPtr& newChild) = 0;
 };

include/ifaces/ILinkMixin.h

@@ -2,15 +2,15 @@
 #include <memory>
 #include "ifaces/ILink.h"
 
-class ILinkMixin;
-
-using MixinPtr = std::shared_ptr<ILinkMixin>;
-using LinkPtr = std::shared_ptr<ILink<ILinkMixin>>;
-
+template <class TElem>
 class ILinkMixin {
 public:
+	using LinkPtr = std::shared_ptr<ILink<TElem>>;
+	using ElemPtr = std::shared_ptr<TElem>;
+
 	virtual ~ILinkMixin() = default;
-	virtual void linkChild(const MixinPtr& child) = 0;
+	virtual void linkChild(const ElemPtr& child) = 0;
 	virtual void unlinkParent() = 0;
+	virtual const std::vector<ElemPtr>& children() = 0;
 	virtual LinkPtr getLink() = 0;
 };

include/ifaces/INode.h

@@ -6,7 +6,7 @@ class INode;
 
 using NodePtr = std::shared_ptr<INode>;
 
-class INode : public virtual ILinkMixin {
+class INode : public virtual ILinkMixin<INode> {
 public:
 	~INode() = default;
 	virtual const std::string& name() const = 0;