[Patch] libstdc++/11729 (DR 280)

[Paolo Carlini]

Hi,

in Lillehammer this issue became [Ready] and I believe we can safely
implement the resolution and close our *long* standing PR: I'm just
adding overloads with two template parameters instead of "upgrading"
with a second parameter the existing ones: the safest solution from the
point of view of binary compatibility (as also indicated by Steve Cleary
in the DR). This is also completely consistent with our iterator classes.

Honestly, I don't see a real need for also adding a templated assignment
operator (as per point A of the proposed resolution) and I would punt
for now on that - we can always add it later, in case - unless someone
can see a compelling reason for doing that now, feedback very appreciated!

Tested x86-linux.

Paolo.

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