ROL: "using namespace std" anti-pattern

[rileyjmurray]

There are a 15 files in ROL/src that use the "using namespace std" (anti-)pattern. I noticed this when compiling with clang 17.

My compiler mostly complained about unqualified use of std::forward in one file (ROL_VectorClone.hpp). But there might be other places where unqualified standard library functions are used.

Does anyone have objections to me removing the "using namespace std;" lines and making things explicit, as needed?

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[ccober6]

@trilinos/rol

[gregvw]

I will take care of these

[gregvw]

These are have all been fixed in the ROL development branch so it's just a matter of merging to Trilinos.

I wrote a clang-tidy check that can either automatically replace using namespace foo with using foo::bar in the same location for every bar symbol used or alternatively prepend all of the symbols with the appropriate foo:: namespace qualifier if that is of any interest.

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