On 11/24/2011 1:07 PM, Robert Ramey wrote:
Fusion includes a number of binary functions such as join, equal, less, etc.
Looking at the code suggests that they just work element by element in sequential order.
But what about associative tuples? For example
struct account {}; struce amount {};
typedef boost::fusion::set< account, amount
debit;
typedef boost::fusion::set< amount, account
debit2.
clearly the types are meant to be the "same" so I would expect
boost::fusion::join(debit, debit2) to function and return one type. I'm thinking it doesn't do that. Any observations/suggestions that any Fusion guru would like to share would be appreciated.
Join simply creates a joint_view which concatenates debit and debit2: joint_view<debit, debit2> What you probably want are set operations such as set_union. Unfortunately, we do not have those yet. Such set operations should be cool to implement if anyone is interested in contributing. Regards, -- Joel de Guzman http://www.boostpro.com http://boost-spirit.com