lambdacallback.cpp

#include <wil/resource.h>

template<typename Q> bool SubmitThreadpoolLambda(Q&& fn)
{
    using base_type = std::decay_t<Q>;

    struct ContextObject : base_type
    {
        ContextObject(Q&& q) : base_type(std::move(q)) {}

        static void NTAPI Callback(PTP_CALLBACK_INSTANCE, PVOID context)
        {
            std::unique_ptr<ContextObject> self(reinterpret_cast<ContextObject*>(context));
            (*self)();
        }
    };

    auto co = std::make_unique<ContextObject>(std::forward<Q>(fn));
    if (::TrySubmitThreadpoolCallback(&ContextObject::Callback, co.get(), nullptr))
    {
        co.release();
        return true;
    }
    else
    {
        return false;
    }        
}

void use()
{
    wil::slim_event evt;

    SubmitThreadpoolLambda([&evt]() {
        evt.SetEvent();
        });

    evt.wait();
}