Re: [swift-users] CustomStringConvertible?

[Joanna Carter via swift-users]

Greetings

> Thanks for your reply, Rien. I just tried this again, and now it seems that 
> either is acceptable. Seems a little weird, but I guess I’d rather have more 
> flexibility than less.

> class GPS : Powerable, CustomStringConvertible {
> // Either of these work
> //var description: String {
> //return "I am a GPS"
> //}
> var description:String = "I am a GPS"

You can also implement description as a let, since there is no intention to 
modify it :

class GPS : Powerable, CustomStringConvertible
{
  let description = "I am a GPS"
  
  …
}

Joanna

--
Joanna Carter
Carter Consulting

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Re: [swift-users] CustomStringConvertible?

[Rien via swift-users]

Ah, yes. It is possible to ‘store’ it as a fixed string.
But I would still expect the compiler to treat it as if it were a computed 
property.
Given that this is a protocol and a protocol cannot define stored properties.
(yet anyway)

OTOH, what do I know about compilers… lol!

Regards,
Rien

Site: http://balancingrock.nl
Blog: http://swiftrien.blogspot.com
Github: http://github.com/Balancingrock
Project: http://swiftfire.nl - An HTTP(S) web server framework in Swift







> On 08 Sep 2017, at 20:26, Michael Rogers  wrote:
> 
> Thanks for your reply, Rien. I just tried this again, and now it seems that 
> either is acceptable. Seems a little weird, but I guess I’d rather have more 
> flexibility than less.
> 
> protocol Powerable {
> var isOn:Bool { get set } // Must have get and set
> var usesDC:Bool { get } // Must have get, may have set
> func turnOn()
> func turnOff()
> }
> 
> class GPS : Powerable, CustomStringConvertible {
> // Either of these work
> //var description: String {
> //return "I am a GPS"
> //}
> var description:String = "I am a GPS"
> var isOn: Bool = false
> var usesDC: Bool = false
> 
> // does the obvious
> func turnOn(){
> isOn = true
> }
> 
> // does the obvious
> func turnOff() {
> isOn = false
> }
> }
> 
> print(GPS()) // output: I am a GPS (both cases)
> 
> Michael
> 
>> On Sep 8, 2017, at 1:21 PM, Rien  wrote:
>> 
>> It cannot be ‘stored’ I would think.
>> I always compute my implementations.
>> 
>> Regards,
>> Rien
>> 
>> Site: http://balancingrock.nl
>> Blog: http://swiftrien.blogspot.com
>> Github: http://github.com/Balancingrock
>> Project: http://swiftfire.nl - An HTTP(S) web server framework in Swift
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>>> On 08 Sep 2017, at 19:47, Michael Rogers via swift-users 
>>>  wrote:
>>> 
>>> Quick question (for my own edification, as well as to demonstrate to my 
>>> students the power of this mail list ), is CustomStringConvertible a 
>>> stored property or a computed property? The docs say the latter, but when 
>>> using Xcode’s fabulous FIX button, it seems to imply it’s a stored 
>>> property. 
>>> 
>>> Michael
>>> ___
>>> swift-users mailing list
>>> swift-users@swift.org
>>> https://lists.swift.org/mailman/listinfo/swift-users
>> 
> 

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Re: [swift-users] CustomStringConvertible?

[Michael Rogers via swift-users]

Thanks for your reply, Rien. I just tried this again, and now it seems that 
either is acceptable. Seems a little weird, but I guess I’d rather have more 
flexibility than less.

protocol Powerable {
var isOn:Bool { get set } // Must have get and set
var usesDC:Bool { get } // Must have get, may have set
func turnOn()
func turnOff()
}

class GPS : Powerable, CustomStringConvertible {
// Either of these work
//var description: String {
//return "I am a GPS"
//}
var description:String = "I am a GPS"
var isOn: Bool = false
var usesDC: Bool = false

// does the obvious
func turnOn(){
isOn = true
}

// does the obvious
func turnOff() {
isOn = false
}
}

print(GPS()) // output: I am a GPS (both cases)

Michael

> On Sep 8, 2017, at 1:21 PM, Rien  wrote:
> 
> It cannot be ‘stored’ I would think.
> I always compute my implementations.
> 
> Regards,
> Rien
> 
> Site: http://balancingrock.nl
> Blog: http://swiftrien.blogspot.com
> Github: http://github.com/Balancingrock
> Project: http://swiftfire.nl - An HTTP(S) web server framework in Swift
> 
> 
> 
> 
> 
> 
> 
>> On 08 Sep 2017, at 19:47, Michael Rogers via swift-users 
>>  wrote:
>> 
>> Quick question (for my own edification, as well as to demonstrate to my 
>> students the power of this mail list ), is CustomStringConvertible a stored 
>> property or a computed property? The docs say the latter, but when using 
>> Xcode’s fabulous FIX button, it seems to imply it’s a stored property. 
>> 
>> Michael
>> ___
>> swift-users mailing list
>> swift-users@swift.org
>> https://lists.swift.org/mailman/listinfo/swift-users
> 

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Re: [swift-users] CustomStringConvertible?

[Rien via swift-users]

It cannot be ‘stored’ I would think.
I always compute my implementations.

Regards,
Rien

Site: http://balancingrock.nl
Blog: http://swiftrien.blogspot.com
Github: http://github.com/Balancingrock
Project: http://swiftfire.nl - An HTTP(S) web server framework in Swift







> On 08 Sep 2017, at 19:47, Michael Rogers via swift-users 
>  wrote:
> 
> Quick question (for my own edification, as well as to demonstrate to my 
> students the power of this mail list ), is CustomStringConvertible a stored 
> property or a computed property? The docs say the latter, but when using 
> Xcode’s fabulous FIX button, it seems to imply it’s a stored property. 
> 
> Michael
> ___
> swift-users mailing list
> swift-users@swift.org
> https://lists.swift.org/mailman/listinfo/swift-users

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[swift-users] CustomStringConvertible?

[Michael Rogers via swift-users]

Quick question (for my own edification, as well as to demonstrate to my 
students the power of this mail list ), is CustomStringConvertible a stored 
property or a computed property? The docs say the latter, but when using 
Xcode’s fabulous FIX button, it seems to imply it’s a stored property. 

Michael
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