COMP: Fixed compiler error in C++11

Specifically clang said:
 "ISO C++11 does not allow access declarations; use using declarations instead"

So just added 'using'.

Change-Id: I62a2614db5cb60d8dd7dcc125414061d35870560
Merge branch 'CXX11' into release-3.20

Change-Id: I8d9254a458e5d10c4e0f9b0751d03dc0a568728a