Re: [boost] [binary-int] pre-release available

From: Matt Calabrese (rivorus_at_[hidden])
Date: 2005-09-04 23:55:08

On 9/3/05, Matt Calabrese <rivorus_at_[hidden]> wrote:
> 
> 
> On 9/2/05, Paul Mensonides <pmenso57_at_[hidden]> wrote:
> 
> > The problem is that there isn't any arbitrary precision arithmetic 
> > support in
> > the pp-lib. If there was, you could do better than that for syntax: 
> > 
> > BOOST_BINARY_INT( 1100 0011 1010 )
> > 
> 
> I do not immediately see how to implement it allowing the syntax you 
> describe (where your nibbles are simply separated by spaces rather than 
> using a Boost.Preprocessor sequence), so if you could, please enlighten me 
> as I know you must be more experienced with the preprocessor (I love 
> Boost.Preprocessor by the way).

Nevermind, I figured out a way to do it myself with lots of macro magic. A 
version allowing the more simple syntax you originally alluded to is 
available here:

http://www.illegal-immigration.com/Riv/boost/binary_literal.hpp

Also, I changed the macro name to BOOST_BINARY_LITERAL

Usage is as simple as:

BOOST_BINARY_LITERAL( 101 0111 1010 0110 )

The first nibble is allowed to be written with under 4 explicit bits, but 
the remaining nibbles must use a complete 4 bits each. This was done to 
avoid confusion.

If you wish to append standard integer suffixes, you can use the macro 
BOOST_SUFFIXED_BINARY_LITERAL

Usage for that is:

BOOST_SUFFIXED_BINARY_LITERAL( 101 0111 1010 0110, UL ) 

It should work for integers of any reasonable size, even well beyond 64 
bits, and results in a hex literal at preprocessing time.

-- 
-Matt Calabrese