1 files changed, 12 insertions, 0 deletions
diff --git a/src/google/protobuf/repeated_field.cc b/src/google/protobuf/repeated_field.cc
index 3230c04..f7beb11 100644
--- a/src/google/protobuf/repeated_field.cc
+++ b/src/google/protobuf/repeated_field.cc
@@ -39,6 +39,18 @@ namespace google {
 namespace protobuf {
 namespace internal {
 
+void RepeatedPtrFieldBase::Reserve(int new_size) {
+  if (total_size_ >= new_size) return;
+
+  void** old_elements = elements_;
+  total_size_ = max(total_size_ * 2, new_size);
+  elements_ = new void*[total_size_];
+  memcpy(elements_, old_elements, allocated_size_ * sizeof(elements_[0]));
+  if (old_elements != initial_space_) {
+    delete [] old_elements;
+  }
+}
+
 void RepeatedPtrFieldBase::Swap(RepeatedPtrFieldBase* other) {
   void** swap_elements       = elements_;
   int    swap_current_size   = current_size_;