Re: [boost] Policy proposal: All user-visible exceptions should be thrown through BOOST_THROW_EXCEPTION

There are exception_ptr use cases for single threaded programs.

As an example, I've written an ASIO-based application that makes use of callbacks where one of the arguments is an exception_ptr. If the exception_ptr is not null then it contains the exception that occurred during the requested operation. It can run with a single thread and the exception transporting would still be useful. Before I used exception transporting I was passing a status indicator which was not nearly as nice. -- Brant