[v3] libstdc++/48848

[Paolo Carlini]

Hi,

tested x86_64-linux, committed to mainline.

As regards the move assignment operator, the only non-trivial bit of the 
patch, per today's discussion on the reflector, essentially we want to 
be consistent with the resolution of LWG 675, thus make sure first that 
the move-assigned-to object releases any owned resources. This implies 
that at minimum the FDIS should be amended to a linear in size(), 
instead of constant, complexity (also, the "as-if" verbiage about 
resize(v.size()) is evidently bogus, likely a pasto from the preceding 
copy-assignment operator).

Thanks,
Paolo.

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