-//===-- Support/GraphTraits.h - Graph traits template -----------*- C++ -*-===//
+//===-- llvm/ADT/GraphTraits.h - Graph traits template ----------*- C++ -*-===//
//
-// This file defines the little GraphTraits<X> template class that should be
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the little GraphTraits<X> template class that should be
// specialized by classes that want to be iteratable by generic graph iterators.
//
// This file also defines the marker class Inverse that is used to iterate over
//
//===----------------------------------------------------------------------===//
-#ifndef SUPPORT_GRAPHTRAITS_H
-#define SUPPORT_GRAPHTRAITS_H
+#ifndef LLVM_ADT_GRAPHTRAITS_H
+#define LLVM_ADT_GRAPHTRAITS_H
+
+namespace llvm {
// GraphTraits - This class should be specialized by different graph types...
// which is why the default version is empty.
// static ChildIteratorType child_begin(NodeType *)
// static ChildIteratorType child_end (NodeType *)
- // Return iterators that point to the beginning and ending of the child
+ // Return iterators that point to the beginning and ending of the child
// node list for the specified node.
- //
+ //
// typedef ...iterator nodes_iterator;
// If anyone tries to use this class without having an appropriate
// specialization, make an error. If you get this error, it's because you
// need to include the appropriate specialization of GraphTraits<> for your
- // graph, or you need to define it for a new graph type. Either that or
+ // graph, or you need to define it for a new graph type. Either that or
// your argument to XXX_begin(...) is unknown or needs to have the proper .h
// file #include'd.
//
//
template <class GraphType>
struct Inverse {
- GraphType &Graph;
+ const GraphType &Graph;
+
+ inline Inverse(const GraphType &G) : Graph(G) {}
+};
- inline Inverse(GraphType &G) : Graph(G) {}
+// Provide a partial specialization of GraphTraits so that the inverse of an inverse
+// falls back to the original graph.
+template<class T>
+struct GraphTraits<Inverse<Inverse<T> > > {
+ typedef typename GraphTraits<T>::NodeType NodeType;
+ typedef typename GraphTraits<T>::ChildIteratorType ChildIteratorType;
+
+ static NodeType *getEntryNode(Inverse<Inverse<T> > *G) {
+ return GraphTraits<T>::getEntryNode(G->Graph.Graph);
+ }
+
+ static ChildIteratorType child_begin(NodeType* N) {
+ return GraphTraits<T>::child_begin(N);
+ }
+
+ static ChildIteratorType child_end(NodeType* N) {
+ return GraphTraits<T>::child_end(N);
+ }
};
+} // End llvm namespace
+
#endif