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The standard specifies that all of these "shall not exit via an exception". The containers have been exception safe when these throw, but the 'noexcept' attribute on 'get_allocator' will terminate if an exception is thrown in the copy constructor. The standard doesn't specify a default constructor, so that is allowed to throw an exception (not just pedantry, this makes sense if an allocator has shared data that's allocated in the initial constructor).