[ADT] Add a sum type abstraction for pointer-like types.

[oota-llvm.git] / include / llvm / ADT / FoldingSet.h

diff --git a/include/llvm/ADT/FoldingSet.h b/include/llvm/ADT/FoldingSet.h
index 52d10c1c1245814e42b31854cd3ea81e6e33132a..c9205396591b89bd3cc8d3141c20218cc9356c62 100644 (file)
--- a/include/llvm/ADT/FoldingSet.h
+++ b/include/llvm/ADT/FoldingSet.h
@@ -122,9 +122,10 @@ protected:
   /// is greater than twice the number of buckets.
   unsigned NumNodes;
 
-  ~FoldingSetImpl();
-
   explicit FoldingSetImpl(unsigned Log2InitSize = 6);
+  FoldingSetImpl(FoldingSetImpl &&Arg);
+  FoldingSetImpl &operator=(FoldingSetImpl &&RHS);
+  ~FoldingSetImpl();
 
 public:
   //===--------------------------------------------------------------------===//
@@ -137,7 +138,6 @@ public:
     void *NextInFoldingSetBucket;
 
   public:
-
     Node() : NextInFoldingSetBucket(nullptr) {}
 
     // Accessors
@@ -182,13 +182,11 @@ public:
   bool empty() const { return NumNodes == 0; }
 
 private:
-
   /// GrowHashTable - Double the size of the hash table and rehash everything.
   ///
   void GrowHashTable();
 
 protected:
-
   /// GetNodeProfile - Instantiations of the FoldingSet template implement
   /// this function to gather data bits for the given node.
   virtual void GetNodeProfile(Node *N, FoldingSetNodeID &ID) const = 0;
@@ -269,6 +267,7 @@ template<typename T, typename Ctx> struct ContextualFoldingSetTrait
 class FoldingSetNodeIDRef {
   const unsigned *Data;
   size_t Size;
+
 public:
   FoldingSetNodeIDRef() : Data(nullptr), Size(0) {}
   FoldingSetNodeIDRef(const unsigned *D, size_t S) : Data(D), Size(S) {}
@@ -393,6 +392,10 @@ DefaultContextualFoldingSetTrait<T, Ctx>::ComputeHash(T &X,
 /// implementation of the folding set to the node class T.  T must be a
 /// subclass of FoldingSetNode and implement a Profile function.
 ///
+/// Note that this set type is movable and move-assignable. However, its
+/// moved-from state is not a valid state for anything other than
+/// move-assigning and destroying. This is primarily to enable movable APIs
+/// that incorporate these objects.
 template <class T> class FoldingSet final : public FoldingSetImpl {
 private:
   /// GetNodeProfile - Each instantiatation of the FoldingSet needs to provide a
@@ -417,8 +420,13 @@ private:
 
 public:
   explicit FoldingSet(unsigned Log2InitSize = 6)
-  : FoldingSetImpl(Log2InitSize)
-  {}
+      : FoldingSetImpl(Log2InitSize) {}
+
+  FoldingSet(FoldingSet &&Arg) : FoldingSetImpl(std::move(Arg)) {}
+  FoldingSet &operator=(FoldingSet &&RHS) {
+    (void)FoldingSetImpl::operator=(std::move(RHS));
+    return *this;
+  }
 
   typedef FoldingSetIterator<T> iterator;
   iterator begin() { return iterator(Buckets); }
@@ -498,7 +506,6 @@ public:
 
   Ctx getContext() const { return Context; }
 
-
   typedef FoldingSetIterator<T> iterator;
   iterator begin() { return iterator(Buckets); }
   iterator end() { return iterator(Buckets+NumBuckets); }
@@ -614,9 +621,7 @@ public:
   }
 };
 
-
-template<class T>
-class FoldingSetIterator : public FoldingSetIteratorImpl {
+template <class T> class FoldingSetIterator : public FoldingSetIteratorImpl {
 public:
   explicit FoldingSetIterator(void **Bucket) : FoldingSetIteratorImpl(Bucket) {}
 
@@ -666,8 +671,7 @@ public:
   }
 };
 
-
-template<class T>
+template <class T>
 class FoldingSetBucketIterator : public FoldingSetBucketIteratorImpl {
 public:
   explicit FoldingSetBucketIterator(void **Bucket) :
@@ -694,6 +698,7 @@ public:
 template <typename T>
 class FoldingSetNodeWrapper : public FoldingSetNode {
   T data;
+
 public:
   template <typename... Ts>
   explicit FoldingSetNodeWrapper(Ts &&... Args)
@@ -716,12 +721,12 @@ public:
 /// information that would otherwise only be required for recomputing an ID.
 class FastFoldingSetNode : public FoldingSetNode {
   FoldingSetNodeID FastID;
+
 protected:
   explicit FastFoldingSetNode(const FoldingSetNodeID &ID) : FastID(ID) {}
+
 public:
-  void Profile(FoldingSetNodeID &ID) const { 
-    ID.AddNodeID(FastID); 
-  }
+  void Profile(FoldingSetNodeID &ID) const { ID.AddNodeID(FastID); }
 };
 
 //===----------------------------------------------------------------------===//