microsoft/stl

★ 11,046C++Audience · developerComplexity · 5/5Setup · hard

Mindmap

mindmap
  root((MSVC STL))
    What it is
      C++ std library
      Ships in VS
      Windows only
    Design goals
      Standard conformance
      Performance
      Backwards compat
    Non-goals
      Cross-platform
      C++ extensions
    Audience
      C++ contributors
      Compiler researchers
      Bug reporters

mindmap root((MSVC STL)) What it is C++ std library Ships in VS Windows only Design goals Standard conformance Performance Backwards compat Non-goals Cross-platform C++ extensions Audience C++ contributors Compiler researchers Bug reporters

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Things people build with this

USE CASE 1

Report and track bugs in the MSVC C++ Standard Library directly via the GitHub issue tracker.

USE CASE 2

Contribute an implementation of a newly standardized C++ feature to the library.

USE CASE 3

Study how production-grade C++ standard types like std::vector or std::sort are actually implemented.

USE CASE 4

Verify whether a specific C++ standard conformance issue in Visual Studio has been fixed in the source.

Tech stack

C++MSVCVisual Studio

Getting it running

Difficulty · hard Time to first run · 1day+

Building requires Visual Studio with the C++ workload on Windows only, the build system and contribution guide were still being finalized when the README was written.

In plain English

This repository contains the source code for Microsoft's implementation of the C++ Standard Library, commonly called the STL. The STL is the collection of built-in tools that every C++ program can use: data structures like lists and maps, algorithms for sorting and searching, file input and output, and much more. This particular implementation is the one that ships inside Visual Studio and the MSVC compiler that millions of Windows developers use. The README is upfront that if you are a developer who simply wants to use the STL, you do not need this repository at all. Installing Visual Studio with the C++ workload gives you the STL automatically. This repository is for people who want to contribute to the library itself, report bugs in it, or study how it is built. Microsoft's stated goals for the library are conformance, performance, usability, and compatibility. Conformance means tracking the official C++ standard document as it evolves and implementing new features. Performance means the library has to be fast because C++ programs depend heavily on it. Usability covers things like clear error messages and helpful warnings. Compatibility means that programs compiled with older versions of Visual Studio must still work with newer ones without needing to be recompiled, a constraint that shapes many decisions about what can and cannot change. The repository also lists explicit non-goals: porting to non-Windows platforms, adding extensions beyond what the C++ standard specifies, and implementing experimental C++ proposals that have not yet been officially voted into the standard are all out of scope. The migration of development work to GitHub was still in progress at the time the README was written, with source code complete but the build system, tests, and contribution guidelines still being set up. Bugs can be reported directly through GitHub issues. The full README is longer than what was shown.

Copy-paste prompts

Prompt 1

I found a bug in MSVC where std::ranges::sort gives wrong output with a custom comparator. Help me write a minimal reproducer and draft a GitHub issue for the microsoft/stl repo.

Prompt 2

Walk me through how microsoft/stl implements std::unordered_map, which files contain the hash table logic and how does rehashing work?

Prompt 3

I want to contribute to microsoft/stl. What are the steps to clone the repo, set up the build environment on Windows, and run the test suite?

Prompt 4

Compare the microsoft/stl implementation of std::string_view with the C++17 standard specification and explain any notable design decisions.

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