2.1.118. ‑‑[no_]using_std
This option enables or disables implicit use of the std namespace when standard header files are included in C++.
Note
This option is provided only as a migration aid for legacy source code that does not conform to the C++ standard. Its use is not recommended.
This option is effective only if the source language is C++.
The default is ‑‑no_using_std.