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From: Peter Bartlett (pete_at_[hidden])
Date: 2008-08-20 13:10:16

Quoting Robert Ramey <ramey_at_[hidden]>:

>>> I have no idea what else this might break.
>> It will break people using throw_exception but throwing things not
>> derived from std::exception. This was an implicit requirement anyway,
> What is an "implicit requirement"? You mean that previous users
> of boost/throw_exception where remiss if they didn't derive
> from std::exception or if they didn't surround throw_exception
> with #if BOOST_NO_TYPEID. I like to think I'm a smart guy
> but I don't claim to be telepathic.

Why would you need to surround throw_exception with #if BOOST_NO_TYPEID?
The template function works whether it is defined or not...

>> but users will have previously got away with it if they never actually
>> exercised their code on a no-exceptions platform.
> Hmmm - It looks to me that the previous code would work fine
> on a no-exeptions platform - all it did was call a user defined
> throw_exception function.

At the very least the fact that the declaration for that case in
boost/throw_exception was throw_exception( std::exception ) was at
least a hint that it was intended for use with classes deriving from

Admittedly the client could crack open the boost namespace and add
another overload for their own exception type(s), and include that
before boost/throw_exception.hpp. Perhaps this use case was not
sufficiently thought about in prior discussions. For me though the
benefits of enabling Boost.Exception functionality for all existing
code that uses boost::throw_exception outweighs that cost.

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