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Branch	GCC 7.5.0 and 9.4.0	Visual Studio 2022
	Clang 9.0	MinGW-w64
	Xcode 15.2
	Xcode 15.4
master
development

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The C++ Micro Services project is a collection of components for building modular and dynamic service-oriented applications. It is based on OSGi, but tailored to support native cross-platform solutions.

Proper usage of C++ Micro Services patterns and concepts leads to systems with one or more of the following properties:

• Re-use of software components
• Loose coupling between service providers and consumers
• Separation of concerns, based on a service-oriented design
• Clean APIs based on service interfaces
• Extensible and reconfigurable systems

None, except a recent enough C++ compiler. All third-party library dependencies are included and mostly used for implementation details.

The library makes use of C++17 language and library features and compiles on many different platforms.

Recommended absolute minimum required compiler versions:

• GCC 7.5.0
• Clang 9.0
• Clang from Xcode 10.0 (not tested)
• Visual Studio 2017 (MSVC++ 15.0) (not tested)

Not all of the absolute minimum compiler versions are tested (as noted). We test and recommend the following compilers:

• GCC 11.3.0
• Clang 11.0
• Clang from Xcode 15.2 and 15.4
• Visual Studio 2022

Recommended minimum required CMake version:

• CMake 3.17.0

For all CI builds through GitHub Actions, the CMake version (and version of other provided software) we use is determined by the software provided on the GitHub-hosted runners.

For information about the specific versions of software the runners use, please see the following resources:

• ubuntu-22.04 Runner Information
• macos-13 Runner Information
• macos-14 Runner Information
• windows-2022 Runner Information
• windows-2025 Runner Information

Below is a list of tested compiler/OS combinations:

• GCC 11.4.0 (Ubuntu 22.04)
• Clang 14.0.0 (Ubuntu 22.04)
• Apple Clang from Xcode 15.2.0 (OS X 13.3.0)
• Apple Clang from Xcode 15.4.0 (OS X 14.5.0)
• Visual Studio 2022
• MinGW-w64

The C++ Micro Services project was initially developed at the German Cancer Research Center. Its source code is hosted as a GitHub Project. See the COPYRIGHT file in the top-level directory for detailed copyright information.

This project is licensed under the Apache License v2.0.

CppMicroServices.org welcomes developers with different backgrounds and a broad range of experience. A diverse and inclusive community will create more great ideas, provide more unique perspectives, and produce more outstanding code. Our aim is to make the CppMicroServices community welcoming to everyone.

To provide clarity of what is expected of our members, CppMicroServices has adopted the code of conduct defined by contributor-covenant.org. This document is used across many open source communities, and we believe it articulates our values well.

Please refer to the :any:`Code of Conduct <code-of-conduct>` for further details.

Start by cloning the project repository. It is important to note that since the project utilizes git submodules, you must clone the repository with the --recursive flag. This will also clone the submodules and place them in their respective directories. For further reading about how git submodules work and how to clone them into an already existing repository on your disk, please see Git's documentation.

Essentially, the C++ Micro Services library provides you with a powerful dynamic service registry on top of a managed lifecycle. The framework manages, among other things, logical units of modularity called bundles that are contained in shared or static libraries. Each bundle within a library has an associated :any:`cppmicroservices::BundleContext` object, through which the service registry is accessed.

To query the registry for a service object implementing one or more specific interfaces, the code would look like this:

#include "cppmicroservices/BundleContext.h"
#include "SomeInterface.h"

using namespace cppmicroservices;

void UseService(BundleContext context)
{
  auto serviceRef = context.GetServiceReference<SomeInterface>();
  if (serviceRef)
  {
    auto service = context.GetService(serviceRef);
    if (service) { /* do something */ }
  }
}

Registering a service object against a certain interface looks like this:

#include "cppmicroservices/BundleContext.h"
#include "SomeInterface.h"

using namespace cppmicroservices;

void RegisterSomeService(BundleContext context, const std::shared_ptr<SomeInterface>& service)
{
  context.RegisterService<SomeInterface>(service);
}

The OSGi service model additionally allows to annotate services with properties and using these properties during service look-ups. It also allows to track the life-cycle of service objects. Please see the Documentation for more examples and tutorials and the API reference. There is also a blog post about OSGi Lite for C++.

The Git repository contains two eternal branches, master and development. The master branch contains production quality code and its HEAD points to the latest released version. The development branch is the default branch and contains the current state of development. Pull requests by default target the development branch. See the :ref:`CONTRIBUTING <contributing>` file for details about the contribution process.

The CppMicroServices repository defines its git hooks in the .githooks directory. This directory is set as the directory for git hooks via executing git config core.hooksPath <path> in our CMakeLists.txt file.

If the clang-format pre-commit hook fails because clang-format is not installed, please install it and put it on the path. Similarly, if git-clang-format is not installed, do the same. git-clang-format comes with the LLVM distribution of clang-format.

If this is not feasible for you, you can specify --no-verify when committing your changes. This is heavily discouraged and you must provide a justification as to why you are unable to format your commit.

We reserve the right to reject any pull requests that are not properly formatted and do not have a valid justification specified.