Re: [Boost-users] [proto] need explanation in implementing distributive law

On 10/5/2010 5:43 AM, Mauro Bianco wrote:

Hi all, It is probably already been discovered by everyone at this point, but the code proposed by Andrew does not to work properly to apply distributivity more than once in an expression [works for a*(b+c) but not for a*(b+c*(d+c)) ]

Funny, I never saw the original message. Perhaps it's stuck in a moderation queue or lost in the ether(net).

Here a modified version that seems to work recursively. How does it look?

...

,

struct distr : proto::or_< proto::when< proto::multiplies< proto::_, proto::plus< proto::_, proto::_ > >, proto::call proto::otherwise > > {};

Yes, this looks reasonable. -- Eric Niebler BoostPro Computing http://www.boostpro.com