Yeah, me too, preferring the first version, which I've archived as a
masterpiece at
https://github.com/suntong/lang/blob/master/lang/Go/src/oo/Polymorphism-AnimalVF3.go
with the following notes:
The best way to implement *virtual function* so far, that satisfies the
following challenges:
- Consid
Oh, I like that. This is much better than my "double-passing" version, and
so far the best. Thanks a lot!
On Thu, Nov 24, 2016 at 9:21 PM, xingtao zhao wrote:
> Hi Tong,
>
> Another implementation is https://play.golang.org/p/3_PDTCcJTi.
> You could merge the interface Animal and ExtraFactsor to
Or this implementation: https://play.golang.org/p/5GqspHDJnF
But I prefer the previous version: https://play.golang.org/p/3_PDTCcJTi.
On Thursday, November 24, 2016 at 6:21:24 PM UTC-8, xingtao zhao wrote:
>
> Hi Tong,
>
> Another implementation is https://play.golang.org/p/3_PDTCcJTi.
> You could
Hi Tong,
Another implementation is https://play.golang.org/p/3_PDTCcJTi.
You could merge the interface Animal and ExtraFactsor together if this
extra behavior is not needed. It is listed there just for demonstration.
On Thursday, November 24, 2016 at 12:14:37 AM UTC-8, Nick Patavalis wrote:
>
>
On Thu, Nov 24, 2016 at 10:00 AM, Haddock wrote:
>
> This is merely resorting to a shared function. This does not really
> cover overwriting in the OO sense. The article I mentioned shows how
> to do this:
> http://objectscape.blogspot.de/2013/09/inner-pattern-to-mimic-method.html
Not really! Ton
> I think I finally found the easiest way to make virtual function works,
> based on Nick Patavalis code and Tahir Hashmi's idea:
>
>
> func (a Animal) Output(s Speaker) {
> // Complicated stuff that must not be re-implemented
> fmt.Print("I am a ", s.IsA(),
> ". My name is ", a.Name,
> ", aged
As I said
before, Go's flavor of OO is different from that of other languages. Don't
try to map concepts one-to-one, or you will end up with very contrived
solutions. Always look at the big picture (why am I doing this?) and don't
get side-tracked by synthetic examples.
Most important is def
On Wed, Nov 23, 2016 at 3:49 PM, Tong Sun wrote:
>
> On Wed, Nov 23, 2016 at 12:09 PM, Nick Patavalis wrote:
>
>> For this specific example, something like this:
>> https://play.golang.org/p/FsorWRaLKk
>>
>
> Thanks a lot Nick!
>
> I've simplified it a bit. Now it is:
>
> func (d Dog) Output() {
>
On Wed, Nov 23, 2016 at 12:09 PM, Nick Patavalis wrote:
> For this specific example, something like this: https://play.golang.org/p/
> FsorWRaLKk
>
Thanks a lot Nick!
I've simplified it a bit. Now it is:
func (d Dog) Output() {
// Presumably complicated stuff, not re-implemented
d.Animal.Output
Thanks Chad. This is beyond my understanding for the moment, but I'm sure
it'd be handy someday... Thanks.
On Wed, Nov 23, 2016 at 1:17 PM, wrote:
> Sorry, didn't read the whole thread, but here's how I tackled inheritance
> in my cross compiler: https://play.golang.org/p/UDp7nSLyl2. Granted, I
Sorry, didn't read the whole thread, but here's how I tackled inheritance
in my cross compiler: https://play.golang.org/p/UDp7nSLyl2. Granted, I am
unsure about the unsafe thing, but the concept of a "method dispatcher" is
likely what you need.
On Wednesday, November 23, 2016 at 11:09:03 AM UTC
On Wednesday, November 23, 2016 at 5:17:11 PM UTC+2, Tong Sun wrote:
>
> Can you make it work on play.golang.org, from this code
> https://play.golang.org/p/QjCtD9rGpa, according to your plan?
>
For this specific example, something like this:
https://play.golang.org/p/FsorWRaLKk
/npat
--
You
Yes... so every specific animal type implements it's own Output() method,
which does the trivial IsA() part, and calls Animal's Output() for the
common complicated parts...
On Nov 23, 2016 16:35, "Tong Sun" wrote:
> Have you noticed the IsA() func call there?
>
> On Wed, Nov 23, 2016 at 4:05 AM,
Oh, I think you might not have notice this request from OP:
Please think of the "func Output()" as a very complicated function that I
> only want to define *once *at the base level, not to duplicate into each
> sub classes.
On Wed, Nov 23, 2016 at 10:16 AM, Tong Sun wrote:
> Can you make it w
Can you make it work on play.golang.org, from this code
https://play.golang.org/p/QjCtD9rGpa, according to your plan?
On Wed, Nov 23, 2016 at 10:14 AM, Nick Patavalis
wrote:
> Yes... so every specific animal type implements it's own Output() method,
> which does the trivial IsA() part, and calls
Have you noticed the IsA() func call there?
On Wed, Nov 23, 2016 at 4:05 AM, Nick Patavalis
wrote:
> Hi,
>
> In your *second* example, making Output() a method of Animal will work,
> since it uses only the members (fields) of Animal, and not the fields of
> specific animals (or any behavior that
Further on that, apart from the getters, is it possible to define a
left-value function, so that I can use it to update the member values?
E.g., from https://play.golang.org/p/jlgIFjI268,
func (a *Animal) TheAge() int { return a.Age }
or
func (a *Animal) TheAge() *int { return &a.Age }
*d.TheAge(
Hi,
In your *second* example, making Output() a method of Animal will work,
since it uses only the members (fields) of Animal, and not the fields of
specific animals (or any behavior that varies between animals). That's why
I'm insisting on *real* and *specific* examples, not synthetic ones.
/
Thanks a lot for your explicit example. Much more helpful to me than merely
saying define getters. Much appreciate it!
On Tue, Nov 22, 2016 at 6:27 PM, wrote:
> interfaces only work on methods.
>
> https://play.golang.org/p/o6Ot4IdJZ1
>
> Name, Age , ... are not methods they are fields.You need
No Nick, making Output() a member method won't work.
See my OP and Jesse's answer. I.e., I have to change it from a member
function to a pure function.
On Tue, Nov 22, 2016 at 6:25 PM, Nick Patavalis
wrote:
> Hi,
>
> There is no direct mapping of what you can do with virtual functions in
> other
On Tue, Nov 22, 2016 at 6:23 PM, Jesse McNelis wrote:
> On 23 Nov. 2016 9:03 am, "Tong Sun" wrote:
> >
> > So, once again, thinking in OO, I'll define all of the common variables
> in base class, and common functionalities in virtual functions. How to make
> that idea work in Go?
> >
> > For the a
interfaces only work on methods.
https://play.golang.org/p/o6Ot4IdJZ1
Name, Age , ... are not methods they are fields.You need to make them part
of Speaker interface by using methods instead of fields.
Le mardi 22 novembre 2016 23:03:54 UTC+1, Tong Sun a écrit :
>
>
>
> On Tue, Nov 22, 2016 at
Hi,
There is no direct mapping of what you can do with virtual functions in
other OO languages, and Go. There are different compromises you have to
make; because of this, synthetic examples will probably not help much.
That being said, in the case of your last example I would make Output() a
On 23 Nov. 2016 9:03 am, "Tong Sun" wrote:
>
> So, once again, thinking in OO, I'll define all of the common variables
in base class, and common functionalities in virtual functions. How to make
that idea work in Go?
>
> For the above specific code, how to easily make "func Output" works?
>
You c
On Tue, Nov 22, 2016 at 4:29 PM, Jesse McNelis wrote:
> On Wed, Nov 23, 2016 at 8:16 AM, Tong Sun wrote:
> > Hi,
> >
> > How to architect the OO's virtual function in Go?
> >
> > Please take a look at this (not working) Go program
> > https://play.golang.org/p/qrBX6ScABp
> >
> > Please think of th
On Tue, Nov 22, 2016 at 4:29 PM, Seb Binet wrote:
>
>
> On Tue, Nov 22, 2016 at 10:16 PM, Tong Sun wrote:
>
>> Hi,
>>
>> How to architect the OO's virtual function in Go?
>>
>> Please take a look at this (not working) Go program
>> https://play.golang.org/p/qrBX6ScABp
>>
>> Please think of the "fu
On Tue, Nov 22, 2016 at 10:16 PM, Tong Sun wrote:
> Hi,
>
> How to architect the OO's virtual function in Go?
>
> Please take a look at this (not working) Go program
> https://play.golang.org/p/qrBX6ScABp
>
> Please think of the "func Output()" as a very complicated function that I
> only want to
On Wed, Nov 23, 2016 at 8:16 AM, Tong Sun wrote:
> Hi,
>
> How to architect the OO's virtual function in Go?
>
> Please take a look at this (not working) Go program
> https://play.golang.org/p/qrBX6ScABp
>
> Please think of the "func Output()" as a very complicated function that I
> only want to d
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