Using std::function as a parameter

Question

so the basics of the program is that Application.cpp will pass a function (from any class) to the EventDispatcher in EventDispatcher.h by passing a function to call into the SubsticbeToEvent function in the EventDispatcher.h. I have managed to set up the function deleration in EventDispatcher.h without any issues:

static void SubscribeToEvent(size_t _eventID, const std::function<void(Event&)> _func) {} 

However I'm unsure how to pass the function into SubscribeToEvent

This is the function, remember it is in a class called Application

void HelloWorld(Engine::Event& e)
{
    Engine::Logger::Debug("Hello World");
}

This is how I am calling SubscribeToEvent

Engine::EventDispatcher::SubscribeToEvent(e, Application::HelloWorld); 

This is the error I am receiving: no sutible constructor exists to convert from "void (Engine::Event& e)" to "std::function<void(Engine::Event&)".

Through research I have tried the following:

Engine::EventDispatcher::SubscribeToEvent(e, { Application::HelloWorld }); 

Engine::EventDispatcher::SubscribeToEvent(e, [] { Application::HelloWorld });

Engine::EventDispatcher::SubscribeToEvent(e, [&] { Application::HelloWorld }); 

Engine::EventDispatcher::SubscribeToEvent(e, { Application::HelloWorld(Event& e }); 

(and without the variable name, only the type)

Engine::EventDispatcher::SubscribeToEvent(e, [] { Application::HelloWorld(Event& e }); 

(and without the variable name, only the type)

Engine::EventDispatcher::SubscribeToEvent(e, [&] { Application::HelloWorld(Event& e }); 

(and without the variable name, only the type)

I'm unsure what is wrong, any suggestions would be great, Thanks.