Re: [boost] Infinite precision integer draft

From: Maarten Kronenburg (M.Kronenburg_at_[hidden])
Date: 2006-05-25 11:04:19

Joe,
Forgot to mention that for conversion
to bool type one can also use
if( x != 0 )
which works for base type int and for
type integer.
This one should be used in templates.
if( !x.is_zero() )
of
if( x.get_sign() )
only works for type integer,
and therefore should not be used in
templates.
So if there are templates which work with
if( x )
where x is a template type parameter int,
when this template should also work for
template type parameter integer, this should
be replaced by
if( x != 0 )
This is a price that has to be payed for
avoiding ambiguities generated with
a bool conversion operator in integer.
By the way I wonder if
if( x )
also works when x is a floating point
type like float, double or long double.
Regards, Maarten.

"Joe Gottman" <jgottman_at_[hidden]> wrote in message
news:e52u60$h8i$1_at_sea.gmane.org...
>
> "Maarten Kronenburg" <M.Kronenburg_at_[hidden]> wrote in message
> news:e5254e$tba$1_at_sea.gmane.org...
> > In the boost vault
> > http://boost-consulting.com/vault/
> > under Math - Numerics the document
> > infintdraft.pdf contains the
> > Proposal for an Infinite Precision Integer
> > for Library Technical Report 2, Draft.
>
>    There's a few members that I'd really like to see.
>
> First, an operator unspecified_bool_type(), like the one found in
> shared_ptr.  There's a lot of code that looks like the following:
>
> long x = doSomething();
> if (x) { //whatever.
>
> If integer is going to be a drop-in replacement for long then it should
have
> this functionality.
>
> Second, it would be very nice if we could have a two-parameter constructor
> for emulating scientific notation:
>
> integer googol(1, 100);
>
> I'm not sure how technically feasible this second one is, but it would
> certainly be useful.
>
> Joe Gottman
>
>
>
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