aspiring_actor.hpp

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#pragma once
 
#include <mbgl/actor/mailbox.hpp>
#include <mbgl/actor/message.hpp>
#include <mbgl/actor/actor_ref.hpp>
 
#include <memory>
#include <future>
#include <type_traits>
#include <cassert>
 
namespace mbgl {
 
template <class Object>
class EstablishedActor;
 
template <class Object>
class Actor;
 
template <class Object>
class AspiringActor {
public:
    AspiringActor() : mailbox(std::make_shared<Mailbox>()) {
        // mailbox starts closed because the `Object` hasn't yet been constructed
        assert(!mailbox->isOpen());
    }
    
    AspiringActor(const AspiringActor&) = delete;
    
    ActorRef<std::decay_t<Object>> self() {
        return ActorRef<std::decay_t<Object>>(object(), mailbox);
    }
    
private:
    std::shared_ptr<Mailbox> mailbox;
    std::aligned_storage_t<sizeof(Object)> objectStorage;
    
    Object& object() {
        return *reinterpret_cast<Object *>(&objectStorage);
    }
    
    friend class EstablishedActor<Object>;
    friend class Actor<Object>;
};
 
} // namespace mbgl