The design of absl::StrCat...
summary
absl::StrCat implements a one‑allocation concatenation that avoids the cascade of temporaries created by repeated operator+ by converting inputs to AlphaNum (a small buffer plus string_view) then copying into a pre sized buffer, using initializer_list to support unlimited arguments and a static_cast to const AlphaNum& to avoid copies. Benchmarks show about three times faster than snprintf style approaches, and the implementation called CatPieces proves the idea with simple memcpy assembly of the result.
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