Small Fixtures Hide Steep Slopes: A Cost-Class Gate for AI C++ Patches
This story is from 2026-09-24. It is preserved in the archive; the latest stories are on the live feed.
Consider a review that starts green. A generated C++ patch matches every golden file. The fixture holds 32 rows. The function returns the expected vector, CI paints the build green, and the review moves on. Two weeks later the same function meets a 200,000-row dump. Latency leaves the budget. A nes…
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- 2026-09-24 19:48 · DEV Community — AI
Small Fixtures Hide Steep Slopes: A Cost-Class Gate for AI C++ Patches