Work around to silent a compiler error on Windows
Work around to silent a compiler error on Windows

This work-around silents the error C2668: 'ROOT::TThreadExecutor::Map': ambiguous call to overloaded function, due to a MS compiler bug (as reported here: https://developercommunity.visualstudio.com/content/problem/225022/wrong-error-c2668-ambiguous-call-to-overloaded-fun.html)

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