Merge 97974 from mainline.

Iterator traits and swap.  closes PR6548 and PR6549

llvm-svn: 98312

Author: tlattner

llvm/include/llvm/ADT/DenseMap.h

@@ -192,6 +192,13 @@ class DenseMap {
     return true;
   }
 
+  void swap(DenseMap& RHS) {
+    std::swap(NumBuckets, RHS.NumBuckets);
+    std::swap(Buckets, RHS.Buckets);
+    std::swap(NumEntries, RHS.NumEntries);
+    std::swap(NumTombstones, RHS.NumTombstones);
+  }
+
   value_type& FindAndConstruct(const KeyT &Key) {
     BucketT *TheBucket;
     if (LookupBucketFor(Key, TheBucket))

llvm/include/llvm/ADT/DenseSet.h

@@ -45,6 +45,10 @@ class DenseSet {
     return TheMap.erase(V);
   }
 
+  void swap(DenseSet& RHS) {
+    TheMap.swap(RHS.TheMap);
+  }
+
   DenseSet &operator=(const DenseSet &RHS) {
     TheMap = RHS.TheMap;
     return *this;
@@ -55,6 +59,12 @@ class DenseSet {
   class Iterator {
     typename MapTy::iterator I;
   public:
+    typedef typename MapTy::iterator::difference_type difference_type;
+    typedef ValueT value_type;
+    typedef value_type *pointer;
+    typedef value_type &reference;
+    typedef std::forward_iterator_tag iterator_category;
+
     Iterator(const typename MapTy::iterator &i) : I(i) {}
 
     ValueT& operator*() { return I->first; }
@@ -68,6 +78,12 @@ class DenseSet {
   class ConstIterator {
     typename MapTy::const_iterator I;
   public:
+    typedef typename MapTy::const_iterator::difference_type difference_type;
+    typedef ValueT value_type;
+    typedef value_type *pointer;
+    typedef value_type &reference;
+    typedef std::forward_iterator_tag iterator_category;
+
     ConstIterator(const typename MapTy::const_iterator &i) : I(i) {}
 
     const ValueT& operator*() { return I->first; }