changkun/modern-cpp-tutorial
What happens to a stranger's pull request here, in the Porchlamp snapshot of 17 October 2026.
For changkun/modern-cpp-tutorial, the reply time and the share with no reply within 14 days both have too small a sample to measure (0 and 0 pull requests counted; 10 needed). It ranks 3,158 of 3,219 overall. It is not ranked for first-time contributors: not enough evidence to show under this lens.
| Rank | 3,158 of 3,219 |
|---|---|
| Score | 27.68 |
| Tier | D |
| Median first reply | — |
| 14-day no-reply share | — |
| First-timer rank | Not enough evidence to show under this lens. |
| Ecosystem | C and C++ |
| Window | — |
Composite
- Rank
- 3,158 of 3,219
- Score
- 27.68
- Tier
- D
- Coverage
- 61% · Ceiling B
- Quadrant
- Graveyard
Coordinates: leverage 33.2 (coverage 91%), friction 75.1 (coverage 37%)
Five pillars
| Pillar | Score | Coverage |
|---|---|---|
| Responsiveness | — | 0% |
| Criticality | 31.0 | 100% |
| Governance | 41.5 | 100% |
| Rigor | 31.4 | 70% |
| Accessibility | 0.0 | 35% |
The measured parameters
Responsiveness
| Parameter | Value | Score | Count | Window | Source |
|---|---|---|---|---|---|
| Decision Rate (90d)Share of outside pull requests that were merged or closed within 90 days. | Not shown: Insufficient sample size | ||||
| PR Ghost Rate (14d)Share of outside pull requests with no maintainer response, merge or close within 14 days. | Not shown: Insufficient sample size | ||||
| First-timer Merge RateShare of first-time outside authors' decided pull requests that were merged. | Not shown: Insufficient sample size | ||||
| Time to First ResponseMedian hours from an outside pull request opening to its first substantive human reply. | Not shown: Insufficient sample size | ||||
| Time to Merge (p90)Hours within which 90% of merged outside pull requests were merged. | Not shown: Insufficient sample size | ||||
Criticality
| Parameter | Value | Score | Count | Window | Source |
|---|---|---|---|---|---|
| DependentsPackages in the registry that depend on this project, counted once each. | Not shown: Not applicable | ||||
| Monthly DownloadsDownloads from the package registry in a month. | Not shown: Not applicable | ||||
| OpenSSF CriticalityOpenSSF criticality score from 0 to 1, computed from the project's public activity signals. | 0.3099 | 31.0 | — | — | proxy:no_dependents_signalraw/github_meta/changkun__modern-cpp-tutorial.json |
Governance
| Parameter | Value | Score | Count | Window | Source |
|---|---|---|---|---|---|
| Elephant FactorThe fewest organisations that account for half of the last year's commits. | 1 | 25.0 | 72 | — | primaryraw/commits_365d/changkun__modern-cpp-tutorial.json |
| Legal IP RegimeThe contributor licence regime: DCO, none, a foundation CLA or a corporate CLA. | No CLA or sign-off found | 85.0 | — | — | primaryraw/governance/changkun__modern-cpp-tutorial.json |
| Promotion LadderHow openly a contributor can become a maintainer, from closed to verified. | Merged pull requests all came from one organisation | 10.0 | — | — | primaryraw/governance/changkun__modern-cpp-tutorial.json |
Rigor
| Parameter | Value | Score | Count | Window | Source |
|---|---|---|---|---|---|
| AI Policy PostureWhether the project has a written policy on AI-assisted contributions. | No written AI policy | 40.0 | — | — | primaryraw/governance/changkun__modern-cpp-tutorial.json |
| Pipeline DefensesHow well the project's build and review pipeline defends against bad changes, 0 to 100. | 25 | 25.0 | — | — | primaryraw/scorecard/changkun__modern-cpp-tutorial.json |
| Substantive Review RateShare of decided pull requests that received a substantive review. | Not shown: Insufficient sample size | ||||
Accessibility
| Parameter | Value | Score | Count | Window | Source |
|---|---|---|---|---|---|
| Developer ExperienceDeveloper experience, 0 to 100: half CI run time, half setup signals. | Not shown: Insufficient sample size | ||||
| Newcomer ConversionShare of first-time authors whose first pull request merged within 180 days. | Not shown: Insufficient sample size | ||||
| Newcomer Issue SupplyOpen, unassigned, up-to-date issues marked for newcomers. | 0 | 0.0 | — | — | primaryraw/gfi/changkun__modern-cpp-tutorial.json |
| Newcomer Return RateShare of those merged first-time authors who sent a second pull request within 90 days. | Not shown: Insufficient sample size | ||||
Persona view
| Persona | Rank | Score | Tier | Status |
|---|---|---|---|---|
| Balanced | 3,158 of 3,219 | 27.68 | D | Rated |
| First-timer | Not enough evidence to show under this lens. | |||
| Career capital | This repository's production-criticality signal is not yet high enough for career-capital ranking. | |||
| Senior systems | Fewer than 3 organizations account for most commits (not multi-vendor). | |||
| AI-assisted | 3,612 of 3,696 | 29.28 | D | Rated |
Integrity
- Snapshot
- 2026-10-17
- Raw hash
- 013e6c252993f83f289737bc58d1f12fbeeb376d86c1b7e473fdde58d3b680a6
No suspicion flags on this repository.
The full record is in data/2026-10-17/repos/f6.json, under the key changkun/modern-cpp-tutorial.
How every number is measured: Porchlamp methodology.
Open an issue about this record and say what looks wrong.
Porchlamp (2026). changkun/modern-cpp-tutorial. Snapshot 2026-10-17. https://porchlamp.org/projects/changkun/modern-cpp-tutorial/. CC BY 4.0.
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