Re: [boost] Wishes for special pairs

From: David Abrahams (david.abrahams_at_[hidden])
Date: 2001-09-22 12:05:29

How many of these pairs are really half-open ranges (e.g. of iterators?)
There is work to be completed on class templates which fill this role (see
boost/half_open_range.hpp).

-Dave

----- Original Message -----
From: "Daryle Walker" <darylew_at_[hidden]>
To: "Boost" <boost_at_[hidden]>
Sent: Saturday, September 22, 2001 12:23 PM
Subject: [boost] Wishes for special pairs

> I thought of these a while ago.  I don't know if I'm ever going to do
> something with these ideas, but maybe one of you can take these.
>
> 1.  Some types in Boost items involve a std::pair with both template
> parameters the same type.  We could compact this somehow.  Too bad we
can't
> do:
>
>     template < typename T >
>     typedef std::pair<T,T>  doublet;
>
> I guess we have to make a class template that inherits from std::pair
and/or
> uses special conversions.
>
> 2.  If we have [1], we should have a make_doublet function template that
> works like std::make_pair.
>
> 3.  Should we have a pair_switch function template, that takes a
> std::pair<X,Y> and returns a std::pair<Y,X> that is the input in the
reverse
> order?  (X and Y can be the same type.  If [1] is done, we could have a
> doublet_switch too.)
>
> --
> Daryle Walker
> Mac, Internet, and Video Game Junkie
> darylew AT mac DOT com
>
>
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