Hello, Thanks for the quick answer. Unfortunately, since i am completely new to boost.fusion, i can't seem to find what you are talking about in the documentation... Can you tell me a bit more about what you have in mind ? For now, I feel i would still have to write the get() function, and optionally check that each property's key type is the value type of the previous one in the "sequence" (which i named composite_property in my first mail). If i do, i guess i won't wait for boost 1.34. Benoît 2006/9/16, Cromwell Enage <sponage@yahoo.com>:
--- Benoit wrote:
Hello everyone,
Howdy!
I have been using properties quite extensively in my work. And these last days I have needed to combine properties numerous times.
By that, I mean that I have n properties p1, p2, ... pn and what I use is get( p1, get( p2, get( ..., get( pn, object ) ... ) ) ) I would very much want to make a composite property p to be used like this : get( p, object ) (most of the time, n=2, but why stop there ? :-) )
I have to tried to find such functionality but in vain so far... Does it not exist? Are there obstacles that i have not foreseen? I am thinking of something like the following:
template<class Prop1, class Prop2> struct composite_property { composite_property(Prop1 p1_, Prop2 p2_) : p1( p1_ ), p2( p2_ ) { }
Prop1 p1; Prop2 p2; };
template<class Prop1, class Prop2> typename property_traits<Prop1>::reference get(composite_property<Prop1, Prop2> comp, typename property_traits<Prop2>::reference x) { return get( comp.p1, get( comp.p2, x ) ); }
How do you all feel about this? I believe it would be very useful!
I believe that the Fusion library provides a map that possesses the functionality you need. You can wait until Boost version 1.34 is released, or you can grab a CVS snapshot in order to play with it right away.
HTH, Cromwell D. Enage
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-- Benoît "When you have a hammer, everything else looks like a nail"