# microsoft/STL

MSVC's implementation of the C++ Standard Library.

Repository: https://github.com/microsoft/STL
Canonical: https://ross.abutalabs.com/products/stl
Language: C++
License: NOASSERTION
License Family: other
Last push: 2026-08-26T23:50:45+00:00

## Health v2 (maintenance only)
Score: 88/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 66, longevity 100
- inputs: {"age_days": 2564, "days_push": 7, "days_rel": 71, "gap_med": 138.5, "n_releases_24m": 5}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 11136, forks 1639 (observed 2026-08-28T04:10:46.193135+00:00)

## What it is
Microsoft's official open-source implementation of the C++ Standard Library (STL) that ships with the MSVC toolset and Visual Studio. The repository hosts the source code, CMake build system, and test suites for contributors and those porting the library elsewhere.

## Use cases
- contribute fixes or features to MSVC's C++ standard library
- report bugs in the STL shipped with Visual Studio
- track which standard library changes appear in each VS release
- reuse the STL implementation in other compilers or tools
- port the C++ standard library to new targets

## When to choose
- you want to contribute to or file issues against MSVC's STL
- you need the standard library source for another toolchain
- you want to follow C++ standard library conformance work

## When to avoid
- you just want to use the STL in your C++ programs - install Visual Studio instead
- you need a standard library for GCC or Clang on Linux/macOS

## Facets
- artifact type: library
- maturity: active
- function: programming-language, developer-tools, testing
- domain: programming-languages, developer-tools, cross-platform
- platform: windows, cpp, c
- tags: stl, standard-library, msvc, visual-studio, cmake

## Member repositories
- microsoft/STL (main) score 88

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:46.193135+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:16:45.946597+00:00, confidence not recorded.
  - readme: https://github.com/microsoft/STL (fetched 2026-08-28T04:10:46.193135+00:00, sha 2ce5f0b92006)
- Data as of 2026-08-30T08:39:29.467469+00:00.