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Refactor by Prompt: A Before/After Study of Free AI on Legacy C++

This story is from 2026-09-04. It is preserved in the archive; the latest stories are on the live feed.

Legacy C++ is ugly. AI promises to clean it. Does the cleanup change behavior? I ran a controlled experiment. One legacy function. One free model. One prompt. The result: complexity dropped 43%. One test failed. The model introduced a silent bug. Disclosure: This article was prepared as part of Mon…

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  1. 2026-09-04 11:06 · DEV Community — AI
    Refactor by Prompt: A Before/After Study of Free AI on Legacy C++

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