Template instantiation stack messages "staggered" -- why?

Template instantiation stack messages "staggered" -- why?

[James Widman]

Hi all,

Something about GCC's instantiation stack messages seems curious to  
me:  for a given stack layer, the location in the message is not that  
of the template instance name that appears in the same message, but  
instead the point of instantiation of a template instance named in  
the immediately preceding message.  (So the shallowest point of  
instantiation is always given in a message that reads "instantiated  
from here".)

I can't see anything wrong with this approach, but I can't see the  
advantage either.  (AFAIK, GCC is unique in this respect:  there are  
other compilers that produce instantiation stacks, but for each of  
the ones that I've seen, each stack message contains both a template  
instance name and its corresponding POI.)

James Widman
-- 
Gimpel Software
http://gimpel.com

Re: Template instantiation stack messages "staggered" -- why?

[James Widman]

On Aug 5, 2005, at 2:22 PM, James Widman wrote:

> Hi all,
>
> Something about GCC's instantiation stack messages seems curious to  
> me:  for a given stack layer, the location in the message is not  
> that of the template instance name that appears in the same  
> message, but instead the point of instantiation of a template  
> instance named in the immediately preceding message.  (So the  
> shallowest point of instantiation is always given in a message that  
> reads "instantiated from here".)

I realise that ISO 14.6.4.1 defines "point of instantiation" to mean  
something different from the meaning I implied above, but I couldn't  
think of a correct short descriptor for those locations.

James Widman
-- 
Gimpel Software
http://gimpel.com