added: ==, !=, clear added: exceptiom qualifier fixed: has() and function which access data now test if instance is valid fixed: std-cstr now sets valid_ to false fixed: assignment methods and cstrs now throw OutOfMemory cosmetic changes
added: ==, !=, clear
added: exceptiom qualifier
fixed: has() and function which access data now test if instance is valid
fixed: std-cstr now sets valid_ to false
fixed: assignment methods and cstrs now throw OutOfMemory
cosmetic changes

tkemmer/ball,tkemmer/ball,tkemmer/ball,tkemmer/ball,tkemmer/ball,tkemmer/ball