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Contributing to C++ Micro Services

This page contains information about reporting issues as well as some tips and guidelines useful to experienced open source contributors. Make sure you read the contribution guideline before you start participating.

Reporting issues

A great way to contribute to the project is to send a detailed report when you encounter an issue. We always appreciate a well-written, thorough bug report, and will thank you for it!

Check that the issue database doesn't already include that problem or suggestion before submitting an issue. If you find a match, add a quick "+1" or "I have this problem too." Doing this helps prioritize the most common problems and requests.

When reporting issues, please include your host OS and compiler vendor and version. Please also include the steps required to reproduce the problem if possible and applicable.

CppMicroServices RFCs

Many changes, including bug fixes and documentation improvements can be implemented and reviewed via the normal GitHub pull request workflow.

Some changes though are "substantial", and we ask that these be put through a bit of a design process and produce a consensus among the CppMicroServices core team.

The "RFC" (request for comments) process is intended to provide a consistent and controlled path for new features to enter the framework.

Please refer to the RFC repository for more information.

Contribution guidelines

This section gives the experienced contributor some tips and guidelines.


Fork the repository and make changes on your fork in a feature branch:

  • If it's a bug fix branch, name it XXXX-something where XXXX is the number of the issue.
  • If it's a feature branch, create an enhancement issue to announce your intentions, and name it XXXX-something where XXXX is the number of the issue.

Code must be formatted according to our `.clang-format` file, using the clang-format tool.

Submit unit tests for your changes.

Update the documentation when creating or modifying features. Test your documentation changes for clarity, concision, and correctness.

Pull request descriptions should be as clear as possible and include a reference to all the issues that they address. If the pull request is a result of a RFC process, include the link to the corresponding RFC pull request.

Commit messages must start with a capitalized and short summary (max. 50 chars) written in the imperative, followed by an optional, more detailed explanatory text which is separated from the summary by an empty line.

Code review comments may be added to your pull request. Discuss, then make the suggested modifications and push additional commits to your feature branch. Post a comment after pushing. New commits show up in the pull request automatically, but the reviewers are notified only when you comment.

Pull requests must be cleanly rebased on top of development without multiple branches mixed into the PR.


Git tip: If your PR no longer merges cleanly, use rebase development in your feature branch to update your pull request rather than merge development.

Before you make a pull request, squash your commits into logical units of work using git rebase -i and git push -f. A logical unit of work is a consistent set of patches that should be reviewed together: for example, upgrading the version of a vendored dependency and taking advantage of its now available new feature constitute two separate units of work. Implementing a new function and calling it in another file constitute a single logical unit of work. The very high majority of submissions should have a single commit, so if in doubt: squash down to one.

After every commit, make sure the test suite passes. Include documentation changes in the same pull request so that a revert would remove all traces of the feature or fix.

Include an issue reference like Closes #XXXX or Fixes #XXXX in commits that close an issue. Including references automatically closes the issue on a merge.

If your change is large enough to warrant a copyright statement, add yourself to the COPYRIGHT file, using the same style as the existing entries.

Sign your work

The sign-off is a simple line at the end of the explanation for the patch. Your signature certifies that you wrote the patch or otherwise have the right to pass it on as an open-source patch. The rules are pretty simple: if you can certify the below (from

Developer Certificate of Origin
Version 1.1

Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
660 York Street, Suite 102,
San Francisco, CA 94110 USA

Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.

Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.

Then you just add a line to every git commit message:

Signed-off-by: Joe Smith <>

Use your real name (sorry, no pseudonyms or anonymous contributions).

If you set your and git configs, you can sign your commit automatically with git commit -s.