aaron.ballman added inline comments.
================
Comment at: clang-tidy/bugprone/NotNullTerminatedResultCheck.cpp:1038
+
+ SmallString<128> NewAddNullTermExprStr;
+ NewAddNullTermExprStr = "\n";
----------------
JonasToth wrote:
> whisperity wrote:
> > aaron.ballman wrote:
> > > This should be done using a `Twine`.
> > Can you please give an example of how to well-approach this? We had issues
> > with using Twines on the stack and then later on running into weird
> > undefined behaviour. The documentation is not clear to a lot of our
> > colleagues on where the `Twine`'s usage barriers are... (Asking this not
> > just for @Charusso but also for a few more colleagues, @baloghadamsoftware
> > e.g.)
> naive approach:
>
> ```
> std::string New =
> Twine("\n").concat(SpaceBeforeStmtStr).concat(exprToStr(..))...).str();
> ```
> I think retrieving a `SmallString` is not supported. Please note, that
> `Twine` does support taking integer and floats directly without prior
> conversion.
> You can use `operator+` instead of `concat` too.
>
> Did this help or did you have more specific issues?
The important bit is -- don't try to store a Twine (locally or otherwise). It's
fine as a parameter in a function, but otherwise you should try to use it only
as part of an expression. e.g., `(Twine("foo") + "bar" + baz).str()` is a good
pattern to get used to.
https://reviews.llvm.org/D45050
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