Stop relying on mapped_iterator's function having a result_type. That facility is deprecated in modern C++ and unnecessary since decltype can be used to query the relevant type.
Stop relying on mapped_iterator's function having a result_type. That facility
is deprecated in modern C++ and unnecessary since decltype can be used to query
the relevant type.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@264321 91177308-0d34-0410-b5e6-96231b3b80d8

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