I'm not sure if a boost exception class is *needed*, but I see no problem in
having one.
Anyway, IIF such an exception class is defined, I *strongly* encourage (as I
did in the past) that it provides:
virtual void raise() const
{
#ifndef BOOST_NO_EXCEPTIONS
throw *this ;
#endif
}
and that boost libraries throw such exceptions *only* by calling .raise():
i.e. never with a throw expression directly in the user code.
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