On 7/9/04 5:40 PM, "Andrei Alexandrescu (See Website for Email)" <andrewalex@hotmail.com> wrote:
"Daryle Walker" <darylew@hotmail.com> wrote in message news:BD1483E4.C2DD%darylew@hotmail.com...
On 7/7/04 12:08 PM, "Andrei Alexandrescu (See Website for Email)" <andrewalex@hotmail.com> wrote: [SNIP]
I see. So I'd like to make a quick poll for Boosters: Overloading the comma operator in a way that could change order of evaluation of its arguments is:
a) an obsolete coding standard b) a valid coding standard c) a valid coding standard, but for reasons x, y, and z, the initialization library doesn't violate it/violates it but gets away with it/etc.
I don't understand what the extra descriptions in [c] mean. How does [c] differ from [b]?
[b] implies that the initialization library is in violation of that coding standard. [c] implies that the initialization library has reasons that makes it exempt from that coding standard.
Also, the initial question is badly formed. It implies that there is a method of overloading the comma operator _without_ making argument evaluation order arbitrary. There isn't. (It's either using the built-in operator in list order, or an user-defined version in arbitrary order.)
There is: expression templates.
How can expression templates re-instate evaluation order? (Note: I'm a newbie at expression templates.) -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT hotmail DOT com