Vendor import of llvm trunk r161861:

http://llvm.org/svn/llvm-project/llvm/trunk@161861

1 files changed, 15 insertions, 19 deletions

diff --git a/include/llvm/ADT/IntrusiveRefCntPtr.h b/include/llvm/ADT/IntrusiveRefCntPtr.h
index 3a1a3f4..a9724ee 100644
--- a/include/llvm/ADT/IntrusiveRefCntPtr.h
+++ b/include/llvm/ADT/IntrusiveRefCntPtr.h
@@ -21,9 +21,9 @@
 #ifndef LLVM_ADT_INTRUSIVE_REF_CNT_PTR
 #define LLVM_ADT_INTRUSIVE_REF_CNT_PTR
 
-#include <cassert>
-
 #include "llvm/Support/Casting.h"
+#include "llvm/Support/Compiler.h"
+#include <memory>
 
 namespace llvm {
 
@@ -34,7 +34,7 @@ namespace llvm {
 /// RefCountedBase - A generic base class for objects that wish to
 ///  have their lifetimes managed using reference counts. Classes
 ///  subclass RefCountedBase to obtain such functionality, and are
-///  typically handled with IntrusivePtr "smart pointers" (see below)
+///  typically handled with IntrusiveRefCntPtr "smart pointers" (see below)
 ///  which automatically handle the management of reference counts.
 ///  Objects that subclass RefCountedBase should not be allocated on
 ///  the stack, as invoking "delete" (which is called when the
@@ -123,25 +123,25 @@ namespace llvm {
       retain();
     }
 
-    template <class X>
-    IntrusiveRefCntPtr(const IntrusiveRefCntPtr<X>& S)
-      : Obj(S.getPtr()) {
-      retain();
+#if LLVM_USE_RVALUE_REFERENCES
+    IntrusiveRefCntPtr(IntrusiveRefCntPtr&& S) : Obj(S.Obj) {
+      S.Obj = 0;
     }
 
-    IntrusiveRefCntPtr& operator=(const IntrusiveRefCntPtr& S) {
-      replace(S.getPtr());
-      return *this;
+    template <class X>
+    IntrusiveRefCntPtr(IntrusiveRefCntPtr<X>&& S) : Obj(S.getPtr()) {
+      S.Obj = 0;
     }
+#endif
 
     template <class X>
-    IntrusiveRefCntPtr& operator=(const IntrusiveRefCntPtr<X>& S) {
-      replace(S.getPtr());
-      return *this;
+    IntrusiveRefCntPtr(const IntrusiveRefCntPtr<X>& S)
+      : Obj(S.getPtr()) {
+      retain();
     }
 
-    IntrusiveRefCntPtr& operator=(T * S) {
-      replace(S);
+    IntrusiveRefCntPtr& operator=(IntrusiveRefCntPtr S) {
+      swap(S);
       return *this;
     }
 
@@ -176,10 +176,6 @@ namespace llvm {
   private:
     void retain() { if (Obj) IntrusiveRefCntPtrInfo<T>::retain(Obj); }
     void release() { if (Obj) IntrusiveRefCntPtrInfo<T>::release(Obj); }
-
-    void replace(T* S) {
-      this_type(S).swap(*this);
-    }
   };
 
   template<class T, class U>