1 files changed, 42 insertions, 3 deletions
diff --git a/deps/icu-small/source/common/cmemory.h b/deps/icu-small/source/common/cmemory.h
index a44f9a1902..f98e13efc0 100644
--- a/deps/icu-small/source/common/cmemory.h
+++ b/deps/icu-small/source/common/cmemory.h
@@ -300,6 +300,14 @@ public:
      */
     ~MaybeStackArray() { releaseArray(); }
     /**
+     * Move constructor: transfers ownership or copies the stack array.
+     */
+    MaybeStackArray(MaybeStackArray<T, stackCapacity> &&src) U_NOEXCEPT;
+    /**
+     * Move assignment: transfers ownership or copies the stack array.
+     */
+    MaybeStackArray<T, stackCapacity> &operator=(MaybeStackArray<T, stackCapacity> &&src) U_NOEXCEPT;
+    /**
      * Returns the array capacity (number of T items).
      * @return array capacity
      */
@@ -376,6 +384,11 @@ private:
             uprv_free(ptr);
         }
     }
+    void resetToStackArray() {
+        ptr=stackArray;
+        capacity=stackCapacity;
+        needToRelease=FALSE;
+    }
     /* No comparison operators with other MaybeStackArray's. */
     bool operator==(const MaybeStackArray & /*other*/) {return FALSE;}
     bool operator!=(const MaybeStackArray & /*other*/) {return TRUE;}
@@ -399,6 +412,34 @@ private:
 };
 
 template<typename T, int32_t stackCapacity>
+icu::MaybeStackArray<T, stackCapacity>::MaybeStackArray(
+        MaybeStackArray <T, stackCapacity>&& src) U_NOEXCEPT
+        : ptr(src.ptr), capacity(src.capacity), needToRelease(src.needToRelease) {
+    if (src.ptr == src.stackArray) {
+        ptr = stackArray;
+        uprv_memcpy(stackArray, src.stackArray, sizeof(T) * src.capacity);
+    } else {
+        src.resetToStackArray();  // take ownership away from src
+    }
+}
+
+template<typename T, int32_t stackCapacity>
+inline MaybeStackArray <T, stackCapacity>&
+MaybeStackArray<T, stackCapacity>::operator=(MaybeStackArray <T, stackCapacity>&& src) U_NOEXCEPT {
+    releaseArray();  // in case this instance had its own memory allocated
+    capacity = src.capacity;
+    needToRelease = src.needToRelease;
+    if (src.ptr == src.stackArray) {
+        ptr = stackArray;
+        uprv_memcpy(stackArray, src.stackArray, sizeof(T) * src.capacity);
+    } else {
+        ptr = src.ptr;
+        src.resetToStackArray();  // take ownership away from src
+    }
+    return *this;
+}
+
+template<typename T, int32_t stackCapacity>
 inline T *MaybeStackArray<T, stackCapacity>::resize(int32_t newCapacity, int32_t length) {
     if(newCapacity>0) {
 #if U_DEBUG && defined(UPRV_MALLOC_COUNT)
@@ -447,9 +488,7 @@ inline T *MaybeStackArray<T, stackCapacity>::orphanOrClone(int32_t length, int32
         uprv_memcpy(p, ptr, (size_t)length*sizeof(T));
     }
     resultCapacity=length;
-    ptr=stackArray;
-    capacity=stackCapacity;
-    needToRelease=FALSE;
+    resetToStackArray();
     return p;
 }