Eliminate dead ASTReduce.

libsolidity/ast/ASTVisitor.h

@@ -313,46 +313,4 @@ private:
 	std::function<void(ASTNode const&)> m_onEndVisit;
 };
 
-/**
- * Utility class that visits the AST in depth-first order and calls a function on each node and each edge.
- * Child nodes are only visited if the node callback of the parent returns true.
- * The node callback of a parent is called before any edge or node callback involving the children.
- * The edge callbacks of all children are called before the edge callback of the parent.
- * This way, the node callback can be used as an initializing callback and the edge callbacks can be
- * used to compute a "reduce" function.
- */
-class ASTReduce: public ASTConstVisitor
-{
-public:
-	/**
-	 * Constructs a new ASTReduce object with the given callback functions.
-	 * @param _onNode called for each node, before its child edges and nodes, should return true to descend deeper
-	 * @param _onEdge called for each edge with (parent, child)
-	 */
-	ASTReduce(
-		std::function<bool(ASTNode const&)> _onNode,
-		std::function<void(ASTNode const&, ASTNode const&)> _onEdge
-	): m_onNode(std::move(_onNode)), m_onEdge(std::move(_onEdge))
-	{
-	}
-
-protected:
-	bool visitNode(ASTNode const& _node) override
-	{
-		m_parents.push_back(&_node);
-		return m_onNode(_node);
-	}
-	void endVisitNode(ASTNode const& _node) override
-	{
-		m_parents.pop_back();
-		if (!m_parents.empty())
-			m_onEdge(*m_parents.back(), _node);
-	}
-
-private:
-	std::vector<ASTNode const*> m_parents;
-	std::function<bool(ASTNode const&)> m_onNode;
-	std::function<void(ASTNode const&, ASTNode const&)> m_onEdge;
-};
-
 }