** Changed in: zorba
       Status: New => In Progress

** Branch linked: lp:~paul-lucas/zorba/bug-1020942

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  vector subscript out of range assertion hit on windows

Status in Zorba - The XQuery Processor:
  In Progress

Bug description:
  in src/zorbatypes/binary.cpp a lot of vectors are accessed with [0],

        copy_without_ws( aString, aLength, &aBase64.theData[0] )

  if in this case aLength is of size 0 the assertion "vector subscript
  out of range" is hit on windows in debug build. This happens because
  size == pos in std::vector implementation on windows:

    reference operator[](size_type _Pos)
                {       // subscript mutable sequence
                if (size() <= _Pos)
                        {       // report error
                        _DEBUG_ERROR("vector subscript out of range");

  Therefore, before accessing a vector with [0] one must check whether
  the size of the vector is > 0. Otherwise the mentioned assertion will

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