My fixes to auto_ptr are lost after the update to SGI STL 3.12. Was it Your intention? If not, perhaps there are other changes lost in the STL files. Ryszard Kabatek Martin-Luther University Halle-Wittenberg, Department of Physical Chemistry Geusaer Str. 88, 06217 Merseburg, Germany Tel. +49 3461 46 2487 Fax. +49 3461 46 2129