# andreasfertig/cppinsights

> A Clang-based source-to-source transformation tool that shows what the compiler does implicitly in C++ code: lambdas, range-based for loops, structured bindings, auto, implicit constructors and casts.

- Magnitude: 3.3 out of 10 — Breakout
- Stars: 4,544 total · +26 stars today, ≈ 35 by evening
- Star trust: star growth looks organic
- Category: Developer tools · Language: C++ · License: MIT · Created: 2018-04-29 · Last push: 2026-08-26
- GitHub: https://github.com/andreasfertig/cppinsights · Homepage: https://cppinsights.io · Page: https://gitnova.dev/en/r/andreasfertig/cppinsights

## Useful for

- Inspect how the compiler expands a lambda or range-based for loop to understand C++ semantics
- Show students in a lecture which special member functions and casts the compiler generates
- Check which type is deduced behind auto or decltype in a given code snippet

## Why it’s here

- 26 stars so far today, about 35 expected by the end of the day. The usual pace is 0 per day, so that's 35× as much.
- Before this, the repository barely got any stars — about 0 per day.
- Hacker News: “C++ Insights – See your source code with the eyes of a Compiler” — 61 points, 1 day ago.

## Star trust

Star growth looks organic.

Star-trust labels are heuristics based on the repository’s behavior, not a check of every stargazer.

## Numbers

- Forks: 266
- Issues and pull requests: 747
- Watchers: 67
- Average over the last week: 5 per day
- Usual pace: 0 per day
- Stars in the last hour (measured): 10
- Latest release: v_21.1 (2026-05-13)

## Stars per day, last 30 days (oldest → newest, today is partial)

2026-09-04 … 2026-10-03: 0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 26

## Hacker News

- C++ Insights – See your source code with the eyes of a Compiler — 61 points, 6 comments: https://news.ycombinator.com/item?id=49928361

## Spotted in now

- Spotted on Hacker News

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Magnitude (0–10) measures how fast and how unusually interest in a repository is growing right now. It is not a quality score.
Days are UTC. “So far today” is a fact; “expected by the end of the day” is a forecast.
Summaries and use cases are written by an LLM (DeepSeek V4.1 Flash) from the README and may be inaccurate: verify specific claims (benchmarks, speed, hardware) in the repository itself.
Data as of 2026-10-03 15:56 UTC, updated every 30 minutes.