I apologize for the late reply. It seems like Steven is right, there is no way to make this work. I had two ideas that I tried: 1) I tried to use operator= to copy the virtual bases after the clone_impl constructor has initialized them using their default constructors (unfortunately). This makes the test case Michael posted work, however operator= is not available for types that contain members of reference types. I don't know how common this situation is, but in the boost::exception tests I did have such exceptions (not on purpose) which maybe means it isn't too unusual. 2) My other idea was instead of operator= to call ~T(), then the T copy constructor with placement new over the T sub-object of clone_impl<T>. This duly crashed the test program, which isn't all that surprising but it was worth a try. :) Emil On Thu, Apr 11, 2013 at 8:27 AM, Steven Watanabe <watanabesj@gmail.com>wrote:
AMDG
On 04/11/2013 08:17 AM, Steven Watanabe wrote:
On 04/10/2013 11:04 PM, Michael Caisse wrote:
The basic problem I'm experiencing is that getting an exception_ptr results inherited parameters getting lost when virtual inheritance is used.
<snip>
The only way to make it work is to restructure clone_impl to use the compiler generated copy constructor.
...and the templated constructor is not a copy constructor. It's impossible to make this work.
In Christ, Steven Watanabe
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