# C++ Core Guideline: The Guidelines Support Library

## Metadata

| Field | Value |
|---|---|
| Institute | Molodetz Institute — Research & Retrieval Division |
| Subject | safe-cpp-practices |
| Document type | Source Citation Card |
| Tier | 2 |
| Source title | C++ Core Guideline: The Guidelines Support Library |
| Source URL | https://www.modernescpp.com/index.php/c-core-guideline-the-guidelines-support-library/ |
| Source type | blog post |
| Date researched | 2026-10-27 |
| Researched by | tai (agent), model: Claude Opus 4.8, on behalf of retoor |
| Research method | Search aggregator result listing (not independently opened or quoted) |
| Confidence | Not independently verified |
| Status | Active |

## Why it's here

GSL overview; span/narrow/not_null from the Core Guidelines search.

## Changelog

| Date | Change |
|---|---|
| 2026-10-27 | Logged as consulted-but-not-analyzed. |