function checkVarClass(var, class, message)
    if type(var) ~= "table" or var["class"] == nil or not var:isInstanceOf(class) then
        throw(message == nil and "Wrong variable class." or message, 1, true)
    end
end

function accessorFunc(tbl, varName, name, defaultValue)
    tbl[varName] = defaultValue
    tbl["get" .. name] = function(self)
        return self[varName]
    end
    tbl["set" .. name] = function(self, value)
        self[varName] = value
    end
end

function rotateAround(entity, pivot, angles)    
    local pos = entity:getPos()
    local localPivotPos = entity:worldToLocal(pivot)

    entity:setAngles(angles)
    pos = pos + (pivot - entity:localToWorld(localPivotPos))    
    entity:setPos(pos)
end