main.cc

// main.exe
...

using namespace timecraft;

int main () {

  Core* core = new Core();
	core->loadPlugin("testplugin"); // load testplugin.dll on windows, testplugin.so on linux

	Scene* scene = new Scene();
	GameObject* go = scene->createGameObject();
	Component* co = go->addComponent("TestPluginComponent");
	int test = co->test();
	// test == 7

	return 0;
}

testplugin.cc

// testplugin.dll
#include "timecraft/scene/gameobject.h"

class TestPluginComponent : public timecraft::Component {
public:

  TestPluginComponent(timecraft::GameObject* obj) : timecraft::Component(obj) {}

	virtual int test () override {
		return 7;
	}
};

extern "C" {
	__declspec(dllexport) void timecraftPluginMain () {
		regTCComponent(TestPluginComponent);
	}
}