Return early for vec.remove(position, 0).

third_party/WebKit/Source/wtf/Vector.h

 /*
  *  Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 1246 matching lines @@
         TypeOperations::moveOverlapping(spot + 1, end(), spot);
         clearUnusedSlots(end() - 1, end());
         ANNOTATE_CHANGE_SIZE(begin(), capacity(), m_size, m_size - 1);
         --m_size;
     }
 
     template<typename T, size_t inlineCapacity, typename Allocator>
     inline void Vector<T, inlineCapacity, Allocator>::remove(size_t position, size_t length)
     {
         ASSERT_WITH_SECURITY_IMPLICATION(position <= size());
+        if (!length)
+            return;
         RELEASE_ASSERT(position + length <= size());
         T* beginSpot = begin() + position;
         T* endSpot = beginSpot + length;
         TypeOperations::destruct(beginSpot, endSpot);
         TypeOperations::moveOverlapping(endSpot, end(), beginSpot);
         clearUnusedSlots(end() - length, end());
         ANNOTATE_CHANGE_SIZE(begin(), capacity(), m_size, m_size - length);
         m_size -= length;
     }
 
@@ skipping 59 matching lines @@
     struct NeedsTracing<Vector<T, N>> {
         static const bool value = false;
     };
 #endif
 
 } // namespace WTF
 
 using WTF::Vector;
 
 #endif // WTF_Vector_h