A static approach doesn’t run-on a certain eg, and is also a compile-go out error to mention compared to that during the a static method.
An incident method works for the a given example of a class, which like are accessed because this (§eleven.eight.12).
14.6.cuatro Digital measures
When a situation approach statement comes with an online modifier, you to definitely experience supposed to be a virtual strategy. When zero virtual modifier is available, the process is said become a low-digital means.
The brand new utilization of a non-virtual system is invariant: New implementation is the identical whether the experience invoked with the an illustration of the category where it is stated or an example of a derived group. On the other hand, brand new implementation of an online method is going to be superseded by the derived categories. The whole process of superseding the brand new utilization of a hereditary digital approach is called overriding you to means (§fourteen.6.5).
From inside the a low-virtual approach invocation, the brand new gather-day sort of the like is the choosing foundation
In the an online means invocation, the newest work with-go out sorts of the instance where you to invocation takes place identifies the genuine strategy implementation so you can invoke. For the specific conditions, when a technique titled Letter was invoked that have a disagreement list A beneficial to your an incident with an amass-go out sorts of C and a hurry-big date types of Roentgen (in which R is actually both C otherwise a class derived from C ), the fresh invocation are processed below:
- On binding-day, overload solution are used on C , N , and you will A beneficial , to select a specific method M regarding the band of procedures declared in and you can passed on of the C . This might be discussed when you look at the §eleven.eight.8.2.
- Upcoming on work on-time:
- In the event the Meters are a low-virtual approach, Meters is actually invoked.
- If not, M try a virtual strategy, and also the very derived utilization of Yards with regards to R was invoked.
For every digital strategy stated in the or inherited because of the a course, there exists a lot of derived utilization of the procedure with respect to that particular group. The essential derived utilization of a virtual method Meters with respect to help you a course Roentgen is set the following:
- In the event the Roentgen contains the initiating virtual declaration out of Yards , then this is actually the really derived utilization of Yards relating so you’re able to R .
- If not, when the Roentgen consists of an bypass away from Meters , following this is actually the very derived utilization of Meters relating in order to R .
- If not, the most derived implementation of M when it comes to R try like many derived utilization of Meters in respect into the lead feet family of R .
Regarding analogy, A brings up a non-digital strategy F and you will a virtual strategy G . The category B brings up a special low-digital means F , thus covering up the passed on F , and just have overrides the brand new passed down strategy G https://datingranking.net/pl/my-dirty-hobby-recenzja/ . Brand new example produces new efficiency:
Observe that the report good.G() invokes B.G , not A.Grams . It is because the work at-date types of the fresh such as for example (that’s B ), not the brand new attain-time variety of the newest including (which is Good ), determines the real method implementation in order to invoke. stop example
Due to the fact procedures can hide passed on steps, it’s possible for a class in order to have numerous digital measures with similar trademark. This does not establish an ambiguity situation, just like the all but the essential derived approach try invisible.
the new C and you can D kinds contain a couple of digital methods toward same signature: The main one delivered of the A great and one delivered by C . The method delivered by C covers the procedure handed down off Good . Ergo, the latest bypass declaration in D overrides the method put because of the C , and is also difficult for D to override the procedure brought by the A . The fresh new analogy supplies new production:
Note that you are able to invoke new undetectable virtual approach because of the accessing an illustration of D because of a reduced derived kind of where in fact the system is not undetectable. end example