[PATCH] Update backward/algo.h

[Paolo Carlini]

Nathan Myers wrote:

> > Are you considering backward/algo.h a standard header?
> > ext/algorithm is not a standard header.
>
> That was the point.  Apparently deque depends on features
> being moved to ext/algorithm, but we don't want <deque> directly
> including <ext/algorithm>,

Nathan, it's not really this way. Deque depends on features which, perhaps (not
necessarily, what do you think of my just posted RFA?) soon will be moved to
ext/memory.

backward/algo.h, on the other hand, used to provide some (extension) bits from
std:: than now have been properly moved to ext/algorithm inside __gnu_cxx.

I don't know if this makes the whole issue clearer...

> we want it to include a name that
> ends with ".h" so that make won't arbitrarily try to delete it.

But what about Gaby point about the strongly deprecated build_dir == src_dir ??

Cheers,
Paolo.