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The libstdc++-v3 implementation of the standard exception classes <stdexcept> differs from the previous release. Now the what_arg is stored in a character array, no more in a string object. This is the implementation from SGI's STL. The SGI's string class does not use a reference counting, but the libstdc++ does. For this reason the old implementation, with a string, should be better for v3. BTW. 1. The string class contains a member function: const allocator_type& get_allocator() const; But CD2 says: allocator_type get_allocator() const; 2. The string class does not have the push_back member function. 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 e-mail: email@example.com