[boost] Re: Expression templates

From: Herb Sutter (hsutter_at_[hidden])
Date: 2000-01-01 20:01:02

>>  std::for_each( container.begin(), container.end(), Elem() += x );
>
>Of COURSE! I should have seen this before! Now somebody should write a
>little expression template library for boost. This obviously fits our
>charter (I think)!

Funny you should say that.

A couple of days ago it occurred to me that expression templates would be an
important and useful library extension (whenever we open up active
standardization again, which I hope will be sooner rather than later; no earlier
than once the TC is finalized in October, of course).

Then it occurred to me that BOOST would be a great forum to get that work
started as a formal library, providing "existing practice" etc. Although basic
expression template work has already been done, published, and otherwise been
available for some years, it (and refinements to it) would be a great addition
to a general-purpose library like BOOST.

Then I felt guilty about proposing such new work to BOOST because I knew I
wouldn't contribute any time to it. As Scott is wont to say, Have a nice day...
:)

Herb

-----Original Message-----
From: Dave Abrahams [mailto:abrahams_at_[hidden]]
Sent: Saturday, January 1, 2000 19:14
To: Herb Sutter; Boost
Subject: [boost] Expression templates

In article <gpfn6sgbrpa0u72nam04to424gu91rt5c0_at_[hidden]> , Herb Sutter
<hsutter_at_[hidden]>  wrote in a post to comp.lang.c++.moderated:

> Option 3: Write for_each with expression templates (1 line, plus no
> recalculation of container.end() and no need to remember to write ++i,
> plus x doesn't need to be an int, plus maybe other benefits...)
>
>  std::for_each( container.begin(), container.end(), Elem() += x );

Of COURSE! I should have seen this before! Now somebody should write a
little expression template library for boost. This obviously fits our
charter (I think)!

-Dave

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