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-rw-r--r--xpcom/glue/nsTArray.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/xpcom/glue/nsTArray.h b/xpcom/glue/nsTArray.h
index 82586a79a..64af17bbb 100644
--- a/xpcom/glue/nsTArray.h
+++ b/xpcom/glue/nsTArray.h
@@ -1503,6 +1503,24 @@ public:
mozilla::Forward<Item>(aItem));
}
+ // Reconstruct the element at the given index, and return a pointer to the
+ // reconstructed element. This will destroy the existing element and
+ // default-construct a new one, giving you a state much like what single-arg
+ // InsertElementAt(), or no-arg AppendElement() does, but without changing the
+ // length of the array.
+ //
+ // array[idx] = T()
+ //
+ // would accomplish the same thing as long as T has the appropriate moving
+ // operator=, but some types don't for various reasons.
+ elem_type* ReconstructElementAt(index_type aIndex)
+ {
+ elem_type* elem = &ElementAt(aIndex);
+ elem_traits::Destruct(elem);
+ elem_traits::Construct(elem);
+ return elem;
+ }
+
// This method searches for the smallest index of an element that is strictly
// greater than |aItem|. If |aItem| is inserted at this index, the array will
// remain sorted and |aItem| would come after all elements that are equal to