[Boost-users] [mpl] a few questions about set and map

From: Yuval Ronen (ronen_yuval_at_[hidden])
Date: 2006-06-19 17:19:13

I spent some time reading the mpl docs, and I have a few questions about 
mpl::set and mpl::map.

1. The docs assert there is a 'front' algorithm for set and map. This 
sounds weird to me, as the order of the types is them unspecified. But 
if I'm wrong, and 'front' is in place, then where is 'back'?

2. Where's multiset and multimap? In the boost/mpl directory I see 
something about multiset, but no real boost/mpl/multiset.hpp header, and 
there's absolutely nothing about multimap.

3. The docs say that the size of joint_view is the arithmetic sum of the 
sizes of the sequences of which it's composed. Is that true also in the 
case of set/map? For an mpl newbie it sounds reasonable that it will 
removed duplicates and might end up with a size that is smaller than the 
sum of its components. If it's not, then it sounds quite useless to use 
it for set/map.

Thanks,
Yuval