Re: [boost] Re: Re: Re: Zero Unnecessary Temporary Objects:ARevolution

From: Yitzhak Sapir (yitzhaks_at_[hidden])
Date: 2002-10-14 10:27:21

That is good to know in and of itself.  Thanks again.  I went and looked
it up, and even followed on to 299.  I've been wondering about these
issues for a long time.  Thank you.

On Mon, 14 Oct 2002, Beman Dawes wrote:

> At 07:58 AM 10/14/2002, Yitzhak Sapir wrote:
>
>  >Furthermore, using the same logic, it is possible to claim, based on
>  >24.4.1.3.3 (operator* definition for a reverse iterator), which states
> (in
>  >the document I'm looking at):
>  >  Effects: Iterator tmp = current;
>  >           return *--tmp;
>
> That text was replaced by DR 198. The new text follows:
>
>    Effects:
>
>      this->tmp = current;
>      --this->tmp;
>      return *this->tmp;
>
>     [Note: This operation must use an auxiliary member variable, rather
>     than a temporary variable, to avoid returning a reference that
>     persists beyond the lifetime of its associated iterator. (See 24.1
>     [lib.iterator.requirements].) The name of this member variable is
>     shown for exposition only. --end note]
>
> Note that I'm not commenting on the discussion, which I haven't been
> following closely.  Just pointing out that quoted text has changed.
>
> --Beman