Sebastian Holtermann 3b2b02825d Source sweep: Replace std::ostringstream when used with a single append ...

This replaces `std::ostringstream`, when it is written to only once.
If the single written argument was numeric, `std::to_string` is used instead.
Otherwise, the single written argument is used directly instead of the
`std::ostringstream::str()` invocation.

2019-08-23 18:52:33 +02:00

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