Re: [Boost-users] Best way to put N ranges into a new container?

Subject: Re: [Boost-users] Best way to put N ranges into a new container?
From: John Dlugosz (JDlugosz_at_[hidden])
Date: 2010-07-07 12:36:11

> > Does something like that already exist?
> 
> Yes, there is a join_iterator, joined_range, and a join function.
> 
> _______________________________________________

After pondering something like join(join(R1,R2),R3), I realized that the whole idea, while it would make functional programming guys smile, is inefficient.  Iterating the joined range and copying one element at a time, with overhead to look for boundaries, will prevent the container's optimized push_back from being called with a range of contiguous memory of trivial items.

So, I really want something that will call that form for the ranges.  Now I'm thinking of a metaprogram like used for matrix math, to collect the N-ary concats and then apply them when the final thing is converted to a vector.

Really, I'd like an "Assign" that uses such techniques instead of throwing everything into a deque and then copying it.

--John






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