Added OwningArrayPtr smart pointer class to provide an analogous class to

OwningPtr except that it works for pointers to arrays.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45266 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/OwningPtr.h

@@ -74,6 +74,60 @@ inline void swap(OwningPtr<T> &a, OwningPtr<T> &b) {
   a.swap(b);
 }
 
+/// OwningArrayPtr smart pointer - OwningArrayPtr provides the same
+///  functionality as OwningPtr, except that it works for array types.
+template<class T> 
+class OwningArrayPtr {
+  OwningArrayPtr(OwningArrayPtr const &);            // DO NOT IMPLEMENT
+  OwningArrayPtr &operator=(OwningArrayPtr const &); // DO NOT IMPLEMENT
+  T *Ptr;
+public:
+  explicit OwningArrayPtr(T *P = 0) : Ptr(P) {}
+
+  ~OwningArrayPtr() {
+    delete [] Ptr;
+  }
+
+  /// reset - Change the current pointee to the specified pointer.  Note that
+  /// calling this with any pointer (including a null pointer) deletes the
+  /// current pointer.
+  void reset(T *P = 0) { 
+    if (P == Ptr) return;
+    T *Tmp = Ptr;
+    Ptr = P;
+    delete Tmp;
+  }
+
+  /// take - Reset the owning pointer to null and return its pointer.  This does
+  /// not delete the pointer before returning it.
+  T *take() { 
+    T *Tmp = Ptr;
+    Ptr = 0;
+    return Tmp;
+  }
+  
+  T &operator[](std::ptrdiff_t i) const {
+    assert(Ptr && "Cannot dereference null pointer");
+    return Ptr[i];
+  }
+ 
+  T *get() const { return Ptr; }
+  operator bool() const { return Ptr != 0; }
+  bool operator!() const { return Ptr == 0; }
+
+  void swap(OwningArrayPtr &RHS) {
+    T *Tmp = RHS.Ptr;
+    RHS.Ptr = Ptr;
+    Ptr = Tmp;
+  }
+};
+
+template<class T>
+inline void swap(OwningArrayPtr<T> &a, OwningArrayPtr<T> &b) {
+  a.swap(b);
+}
+
+
 } // end namespace llvm
 
 #endif