Question

ProjectileManager inherits from EntityManager, which has this as a protected member:

struct EntityDeallocator{
    void operator()(std::pair<sf::String,std::shared_ptr<Entity>> p)const{
        p.second.reset();
        std::cout << "object removed" << std::endl;
    }
};

The ProjectileManager update function:

void ProjectileManager::update(double frameTime){
for(std::map<sf::String,std::shared_ptr<Entity>>::const_iterator it = entities.begin();it!=entities.end();it++){
    it->second->update(frameTime);
    it->second->getObject()->draw(*SfmlFramework::Singleton()->window);
    if(it->second->getObject()->getSprite()->GetPosition().x > SfmlFramework::Singleton()->window->GetWidth() || it->second->getObject()->getSprite()->GetPosition().y > SfmlFramework::Singleton()->window->GetHeight()){
        //I want to call EntityDeallocator on it
    }
}

}

How would I call EntityDeallocator on it? I have tried EntityDeallocator(it) but that says it is an unreferenced local variable.

Answer 1

Says what is an unreferenced local variable? Post your error strings, not your approximation of the error strings..

As for how to call a non-static member function, they are always the same. You need a member function, and an object to bind it to.

struct Fred
{
    operator()(){}
}

//later on...

Fred fred;
fred();

Although not directly pertinent to your question, you may find this link very helpful for understanding how C++ calls member functions. http://www.parashift.com/c++-faq-lite/pointers-to-members.html