[PATCH] [Support] Add StringMap::swap() and a default ctor for iterators

[Reid Kleckner]

This makes StringMap<> more compatible with std::map<std::string, ...>.

http://llvm-reviews.chandlerc.com/D842

Files:
  include/llvm/ADT/StringMap.h

Index: include/llvm/ADT/StringMap.h
===================================================================
--- include/llvm/ADT/StringMap.h
+++ include/llvm/ADT/StringMap.h
@@ -102,6 +102,13 @@
 
   bool empty() const { return NumItems == 0; }
   unsigned size() const { return NumItems; }
+
+  void swap(StringMapImpl &Other) {
+    std::swap(TheTable, Other.TheTable);
+    std::swap(NumBuckets, Other.NumBuckets);
+    std::swap(NumItems, Other.NumItems);
+    std::swap(NumTombstones, Other.NumTombstones);
+  }
 };
 
 /// StringMapEntry - This is used to represent one value that is inserted into
@@ -409,6 +416,8 @@
 public:
   typedef StringMapEntry<ValueTy> value_type;
 
+  StringMapConstIterator() : Ptr(0) { }
+
   explicit StringMapConstIterator(StringMapEntryBase **Bucket,
                                   bool NoAdvance = false)
   : Ptr(Bucket) {
@@ -448,6 +457,7 @@
 template<typename ValueTy>
 class StringMapIterator : public StringMapConstIterator<ValueTy> {
 public:
+  StringMapIterator() : StringMapConstIterator() {}
   explicit StringMapIterator(StringMapEntryBase **Bucket,
                              bool NoAdvance = false)
     : StringMapConstIterator<ValueTy>(Bucket, NoAdvance) {
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