[CallGraph] Use decltype instead of pointer_to_unary_function. NFC.

Reviewers: dblaikie

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D23726

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@279329 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Analysis/CallGraph.h

@@ -173,26 +173,20 @@ namespace llvm {
 template <> struct GraphTraits<clang::CallGraphNode*> {
   typedef clang::CallGraphNode NodeType;
   typedef clang::CallGraphNode *NodeRef;
-  typedef clang::CallGraphNode::CallRecord CallRecordTy;
-  typedef std::pointer_to_unary_function<CallRecordTy,
-                                         clang::CallGraphNode*> CGNDerefFun;
+  typedef NodeType::iterator ChildIteratorType;
+
   static NodeType *getEntryNode(clang::CallGraphNode *CGN) { return CGN; }
-  typedef mapped_iterator<NodeType::iterator, CGNDerefFun> ChildIteratorType;
   static inline ChildIteratorType child_begin(NodeType *N) {
-    return map_iterator(N->begin(), CGNDerefFun(CGNDeref));
-  }
-  static inline ChildIteratorType child_end  (NodeType *N) {
-    return map_iterator(N->end(), CGNDerefFun(CGNDeref));
-  }
-  static clang::CallGraphNode *CGNDeref(CallRecordTy P) {
-    return P;
+    return N->begin();
   }
+  static inline ChildIteratorType child_end(NodeType *N) { return N->end(); }
 };
 
 template <> struct GraphTraits<const clang::CallGraphNode*> {
   typedef const clang::CallGraphNode NodeType;
   typedef const clang::CallGraphNode *NodeRef;
   typedef NodeType::const_iterator ChildIteratorType;
+
   static NodeType *getEntryNode(const clang::CallGraphNode *CGN) { return CGN; }
   static inline ChildIteratorType child_begin(NodeType *N) { return N->begin();}
   static inline ChildIteratorType child_end(NodeType *N) { return N->end(); }
@@ -205,18 +199,19 @@ template <> struct GraphTraits<clang::CallGraph*>
     return CGN->getRoot();  // Start at the external node!
   }
   typedef std::pair<const clang::Decl*, clang::CallGraphNode*> PairTy;
-  typedef std::pointer_to_unary_function<PairTy, clang::CallGraphNode *>
-      DerefFun;
+
+  static clang::CallGraphNode *CGGetValue(PairTy P) { return P.second; }
+
   // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
-  typedef mapped_iterator<clang::CallGraph::iterator, DerefFun> nodes_iterator;
+  typedef mapped_iterator<clang::CallGraph::iterator, decltype(&CGGetValue)>
+      nodes_iterator;
 
   static nodes_iterator nodes_begin(clang::CallGraph *CG) {
-    return map_iterator(CG->begin(), DerefFun(CGdereference));
+    return nodes_iterator(CG->begin(), &CGGetValue);
   }
   static nodes_iterator nodes_end  (clang::CallGraph *CG) {
-    return map_iterator(CG->end(), DerefFun(CGdereference));
+    return nodes_iterator(CG->end(), &CGGetValue);
   }
-  static clang::CallGraphNode *CGdereference(PairTy P) { return P.second; }
 
   static unsigned size(clang::CallGraph *CG) {
     return CG->size();
@@ -229,20 +224,20 @@ template <> struct GraphTraits<const clang::CallGraph*> :
     return CGN->getRoot();
   }
   typedef std::pair<const clang::Decl*, clang::CallGraphNode*> PairTy;
-  typedef std::pointer_to_unary_function<PairTy, clang::CallGraphNode *>
-      DerefFun;
+
+  static clang::CallGraphNode *CGGetValue(PairTy P) { return P.second; }
+
   // nodes_iterator/begin/end - Allow iteration over all nodes in the graph
   typedef mapped_iterator<clang::CallGraph::const_iterator,
-                          DerefFun> nodes_iterator;
+                          decltype(&CGGetValue)>
+      nodes_iterator;
 
   static nodes_iterator nodes_begin(const clang::CallGraph *CG) {
-    return map_iterator(CG->begin(), DerefFun(CGdereference));
+    return nodes_iterator(CG->begin(), &CGGetValue);
   }
   static nodes_iterator nodes_end(const clang::CallGraph *CG) {
-    return map_iterator(CG->end(), DerefFun(CGdereference));
+    return nodes_iterator(CG->end(), &CGGetValue);
   }
-  static clang::CallGraphNode *CGdereference(PairTy P) { return P.second; }
-
   static unsigned size(const clang::CallGraph *CG) {
     return CG->size();
   }