// c++

class LuaEntity : public BaseEntity
{
    public:

    void Initialize()
    {
        // do nothing here
        BaseEntity::Initialize();
    }

    bool PreCollide(PhysicsObject *phys)
    {
        oh->StartEntityHook(this->GetEntity(), "PreCollide");
            oh->Push(phys);
        oh->EndEntityHook(0, 1);
            // dont allow it to collide if we return false in the scripted entity
            if (oh->IsFalse(-1))
                return false;

        // call the BaseEntity's function to let it handle the rest

        return BaseEntity::PreCollide(phys)
    }
}

// lua

local SENT = {}

-- this is called from the hook ScriptedEntityInitialized when it's ready
function SENT:Initialize()
    -- self here is this->GetEntity()
    -- it's basically like doing ent:SetModel() anywhere
    self:SetModel("barrel.cgf")
end

function SENT:PreCollide(phys)
    -- collide with nothing but world
    if not phys:IsWorld() then
        return false
    end
end

sents.Register(SENT, "foobarrel")

-- sents lib

sents.Registered = {}

function sents.Register(SENT, classname)
    SENT.ClassName = classname
    sents.Registered[classname] = SENT
end

function sents.Create(classname)
    local ent = ents.Create("base_entity")
    ent:SetTable(sents.Registered[classname])
    ent:Initialize()

    return ent
end

function sents.Call(ent, func_name, ...)
    if ent[func_name] then
        ent[func_name](ent, ...)
    end
end