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Re: [RFA] Algorithms vs operator* and operator==
- From: Paolo Carlini <pcarlini at suse dot de>
- To: chris <caj at cs dot york dot ac dot uk>
- Cc: libstdc++ <libstdc++ at gcc dot gnu dot org>
- Date: Fri, 28 Jan 2005 16:18:29 +0100
- Subject: Re: [RFA] Algorithms vs operator* and operator==
- References: <418A2C03.8040500@suse.de> <4190098F.5000201@cs.york.ac.uk>
chris wrote:
This seems to be the line we have trouble with, as it could lead to an
expensive copy. I haven't fully tested it yet, but I wonder if this
line would be better expressed as:
typeof(*__first) __value = *__first; (where I've only just found typeof).
I've done some benchmarks, and I'm reasonably convinced that this is
both safe and the most efficent way of doing things. If *__first is a
reference, we just store the reference and access it twice. If
*__first is returned by value, then we only get it by value once and
use it twice. Does this seem safe / sensible?
Hi Chris, today I noticed this thread:
http://gcc.gnu.org/ml/gcc/2005-01/msg01640.html
Not nice...
Paolo.