clang-tidy - abseil-str-cat-append — Extra Clang Tools 9 documentation

# Extra Clang Tools 9 documentation

## clang-tidy - abseil-str-cat-append

# abseil-str-cat-append

Flags uses of `absl::StrCat()` to append to a `std::string`. Suggests `absl::StrAppend()` should be used instead.

The extra calls cause unnecessary temporary strings to be constructed. Removing them makes the code smaller and faster.

    a = absl::StrCat(a, b); // Use absl::StrAppend(&a, b) instead.

Does not diagnose cases where `absl::StrCat()` is used as a template argument for a functor.