Signals Light 🪶

This is a Signals and Slots library. The Signal class is an observer type, it can have Slots(functions) registered to it, and when the Signal is emitted, all registered Slots are invoked. It is written in C++17 and is header only.

Slots can track the lifetime of particular objects and they will disable themselves when one of the tracked objects is destroyed. This is useful if the function you are registering with the Signal holds a reference to an object that might be destroyed before the Signal is destroyed.

This library is 'light' in terms of the boost::Signal2 library, which is thread safe, has ordered connections, and in general is more heavy-weight.

#include <signals_light/signal.hpp>

{
    auto signal = sl::Signal<void(int)>{};
    signal.connect([](int i){ std::cout << i << '\n'; });
    signal.connect([](int i){ std::cout << i * 2 << '\n'; });

    signal(4);  // prints "4\n8\n" to standard output.
}

See the design doc for more information.

Getting Started

There is a CMakeLists.txt in the project root which contains a library target signals-light. This can be imported to your CMake project with add_subdirectory, then use signals-light with target_link_libraries in your project to get access to the header(#include <signals_light/signal.hpp>).