Subject: Re: [boost] Question for C++ experts about exception allocation failure
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-05-17 14:24:26
Adam Badura wrote:
> AFAIK this is not true. At a single execution point we might
> require space for only two exceptions (per thread). The one actually
> thrown and a second one in case we are in catch block and we construct
> a new exception. There is no such thing as current_exception in
> current Standard and the one implemented in Boost.Exception makes a
> (dynamically allocated) copy. How will current_exception be
> implemented in future C++ Standard implementation I don't know.
> More exceptions would be possible if if throwing an exception while
> an exception is already active would not terminate execution. The
> Standard might allow throwing a second exception unless it would lead
> to unwinding the same function for two exceptions at the same time.
> This way we could call to throwing functions in destructors if we just
> did not propagate exceptions from them. If I am not mistaken Standard
> does not allow it and terminates upon throw for a second time (I don't
> know why this is so). So I don't see way of achieving more then 2
> exception objects at the same time (per thread).
terminate will not be called unless the destructor exits with an exception.
You can have an arbitrary number of active exceptions.
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