RE: [boost] Re: Tuples Library Formal Review

From: Ole Lennert (olennert_at_[hidden])
Date: 2001-06-28 01:48:14

Hi Beman,

I enjoy reading the boost mailing list, trying to learn some new stuff
(I am too much of a novice to offer anything yet).
Usually there is a lot of traffic on the boost mailing list. However, I
haven't received anything since Sunday. Is there something wrong with my
setup?

Thanks for your great work with boost. It is a wonderful resource.

Regards,

Ole Lennert

> -----Original Message-----
> From: Beman Dawes [mailto:bdawes_at_[hidden]]
> Sent: Saturday, June 23, 2001 4:12 PM
> To: boost_at_[hidden]; boost_at_[hidden]
> Subject: Re: [boost] Re: Tuples Library Formal Review
> 
> 
> At 08:53 AM 6/23/2001, Kostya Altukhov wrote:
> 
>  >Beman Dawes wrote:
>  >
>  >> >bind(f, _1, _2);
>  >> >one-based indexing is much more intuitive.
>  >>
>  >>My memory of past discussions in the C++ committee was a strong 
> preference
>  >
>  >>for consistent 0 based indexing even in the cases where it is less
>  >>intuitive.
>  >>
>  >Why than std::pair has 'first' and 'second' instead of 'nullth' and 
> 'first'
>  >(and why tuple of two variables should use different scheme than
>  >std::pair)?
>  >
>  >Why do we have std::bind1st and std::bind2nd instead of std::bind0th
>  >and std::bind1st (and I think when we use tuples for binding,
>  >the scheme should be consistent with standard binders)?
> 
> Very good point!
> 
> So the rule actually seems something like:
> 
>     For by-value indexes such as selecting an element in a 
> container, use 0 
> as the base.  Examples: std::vector or std::string.
> 
>     For by-name ordinals such as naming operands, arguments, 
> or structure 
> members, use 1 as the base.  Examples: std::pair.first, std::bind1st.
> 
> On that basis, bind( f, _1, _2 ) seems the correct choice.  
> It might be 
> worth mentioning the above rules in the rationale.
> 
> --Beman
> 
> 
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