Re: [boost] [exception] Lifetime of exception refered to byexception_ptr

Subject: Re: [boost] [exception] Lifetime of exception refered to byexception_ptr
From: Peter Dimov (pdimov_at_[hidden])
Date: 2009-05-13 12:26:49

Adam Badura:
>I failed to find in Boost.Exception documentation any note on how long is 
>the lifetime of an exception object referred to by an exception_ptr. Also I 
>failed to find it in the referred N2179 
>(http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2179.html).
>
> It seems logical to assume that the lifetime is not shorter then the 
> lifetime of any exception_ptr object referring to the exception object. 
> N2179 suggests possibility of use of smart pointer as implementation of 
> exception_ptr which makes that assumption even more justified.

The authoritative reference for exception_ptr is now the C++0x standard 
draft

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2857.pdf

which states in 18.8.5/7:

"The referenced object shall remain valid at least as long as there is an 
exception_ptr object that refers to it."