Knot-DI is a lightweight, header-only Dependency Injection (DI) library for C++03.
It is designed for embedded, legacy, or resource-constrained environments where modern C++ features are unavailable.

• Header-only: No linking required, just include the headers.
• C++03 compatible: Works on old toolchains.
• Singleton and Transient lifetimes
• Custom memory pool support
• Macro-based service registration for multiple constructor arities

• C++03-compatible compiler (e.g., GCC, Clang)
• CMake ≥ 3.10
• [Optional] lcov/genhtml for coverage, clang-format for formatting, Doxygen for docs

# Clone and enter the repo
git clone <repo-url>
cd knot-di

# Build and run tests
cmake -B build -DCMAKE_BUILD_TYPE=Debug
cmake --build build
cd build
ctest --output-on-failure

cmake -B build -DCMAKE_BUILD_TYPE=Debug -DCOVERAGE=ON
cmake --build build
cd build
ctest
make coverage  # Generates coverage-report/ with HTML

cmake --build build --target format

cmake --build build --target doc

Include the main header in your project:

#include <knot-di/Container.hpp>

Register and resolve services:

Knot::Container container;
container.registerService<MyType>(SINGLETON);
MyType* instance = container.resolve<MyType>();

See tests/ContainerTests.cpp for more usage examples.

If you use Nix:

nix develop

This provides all dependencies for building, testing, formatting, and coverage.