Having looked at over half a dozen cpp libs, I have found one or two that
provide this category of container classes the only one I can use is LEDA
being source-available.

Starngely the STL libs don't have it. To me, it would appear natural to
have containers with a cloning constructor for the elements rather than a
default constructor - that severely restricts the use to which the
constructor can be put and one may actually end up putting that piece of
code somewhere else where it does not belong - stuff like database
handling, or grabbing handles for a tete-a-tete with some remote server
etc.

Regds.

Rama Duggal

PS : My news server seems very mercurial, any comments/remarks emailed to
me at sandie@novanet.net.au will be greatly appreciated.
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