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() += 1
*d.TheAge() *= 2
What is the canonical way to do it?
On Tue, Nov 22, 2016 at 11:11 PM, Tong Sun wrote:
> 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, <paraiso.m...@gmail.com> wrote:
>
>> 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 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 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.
>>>> >
>>>> > How can I make it works so that the last output statement, instead of
>>>> being,
>>>> >
>>>> > fmt.Printf("[%v] %s: [%0.2f]\n", k, v.Name(), v.Area())
>>>> >
>>>> >
>>>> > will be this instead:
>>>> >
>>>> > fmt.Printf("[%v] %s\n", k, v.Output())
>>>> >
>>>>
>>>> You define a function:
>>>>
>>>> func Output(s Shape) string {
>>>> return s.Name() + "'s area size is " + s.Area()
>>>> }
>>>>
>>>> Go uses interfaces for polymorphism.
>>>> Other OOP languages can use inheritance for polymorphism too, but Go
>>>> doesn't have inheritance.
>>>>
>>>
>>> Thanks Jesse. That works.
>>>
>>> However I just realized that it is only part of my problem.
>>>
>>> I have a huge list of common variables that I defined in my "base
>>> class", changing it from a member function to a pure function causes almost
>>> every single variable now undefined.
>>>
>>> I can demonstrate the problem with this code
>>> https://play.golang.org/p/QjCtD9rGpa
>>>
>>> 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?
>>>
>>> Thanks
>>>
>>> --
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