Sent from my iPhone
> On 31 Jul 2016, at 21:19, Sean Alling via swift-evolution
> <[email protected]> wrote:
>
> I disagree with this suggestion. Both a protocol conformance & class
> inheritance define behavior conformance. If anything the protocol is more
> explicitly shown because the required properties and methods are conformed to
> within its declaration.
Especially in a language without abstract classes, inheritance and protocol
conformance have a quite important distinction: protocols are about decoupling
concrete implementation from behaviour which is not what inheritance allows or
promises.
>
> We used to define protocol conformance like so: <myProtocol>
> This was removed to make protocol-oriented programming a bit more powerful
> I’d suspect. Also, it reads much easier in the current syntax.
>
> If we were to change it, I would suggest a keyword ‘conform’ because your
> suggested operators don’t make it explicit what behavior is being defined.
> Whereas, the current syntax behavior is simple and easily understood.
>
> Sean
>
>
>
>
>> I remember that this was discussed, but can't find any decision regarding
>> this.. So, as a last chance, don't we want in Swift 3.0, as big source
>> breaking change, separate class inheritance and protocol conformance in
>> syntax?
>>
>> Sorry if there was a decision about this suggestions. Please let know in
>> this case.
>>
>> I.e. when I see the following I can't understand if the class inherits from
>> base class and conforms to protocols or just conforms to two protocols:
>>
>> class MyClass : First, Second, Third {
>> }
>>
>> We don't have a rule to name protocols with 'Protocol'/other suffix/prefix,
>> or classes with 'T'/'C' prefix or something like this, so I believe to
>> improve the clarity of code we should separate in syntax inheritance and
>> conformance.
>>
>> As I understand we should discuss changes in these areas:
>>
>> 1. class inheritance :
>> class Child: BaseClass
>>
>> 2. class conformance :
>> class Child: SomeProtocol1, SomeProtocol2
>>
>> 3. class inheritance + conformance :
>> class Child: BaseClass, SomeProtocol1, SomeProtocol2
>>
>> 4. protocol conformance for structs:
>> struct Struct: SomeProtocol1, SomeProtocol2
>>
>> 5. protocol inheritance:
>> protocol Child: BaseProtocol1, BaseProtocol2
>>
>>
>> My suggestions:
>>
>> I) separate inheritance with double colon :
>>
>> 1. class inheritance :
>> class Child:: BaseClass
>>
>> 2. class conformance :
>> class Child: SomeProtocol1, SomeProtocol2
>>
>> 3. class inheritance + conformance :
>> class Child:: BaseClass : SomeProtocol1, SomeProtocol2
>>
>> 4. protocol conformance for structs:
>> struct Struct: SomeProtocol1, SomeProtocol2
>>
>> 5. protocol inheritance:
>> protocol Child:: BaseProtocol1, BaseProtocol2
>>
>>
>> II) in class definition use parenthesis to separate inheritance and
>> conformance :
>>
>> 1. class inheritance :
>> class Child: BaseClass
>>
>> 2. class conformance :
>> class Child: (SomeProtocol1, SomeProtocol2)
>>
>> 3. class inheritance + conformance :
>> class Child: BaseClass (SomeProtocol1, SomeProtocol2)
>>
>> 4. protocol conformance for structs:
>> struct Struct: SomeProtocol1, SomeProtocol2
>> or
>> struct Struct: (SomeProtocol1, SomeProtocol2)
>> should be discussed
>>
>> 5. protocol inheritance:
>> protocol Child: BaseProtocol1, BaseProtocol2
>>
>>
>> III) special word like 'conforms'
>>
>> 1. class inheritance :
>> class Child: BaseClass
>>
>> 2. class conformance :
>> class Child: conforms SomeProtocol1, SomeProtocol2
>> or
>> class Child conforms SomeProtocol1, SomeProtocol2
>>
>> 3. class inheritance + conformance :
>> class Child: BaseClass conforms SomeProtocol1, SomeProtocol2
>>
>> 4. protocol conformance for structs:
>> struct Struct: conforms SomeProtocol1, SomeProtocol2
>> or
>> struct Struct conforms SomeProtocol1, SomeProtocol2
>>
>> 5. protocol inheritance:
>> protocol Child: BaseProtocol1, BaseProtocol2
>>
>>
>> Thoughts?
>>
>>
>>
>
> _______________________________________________
> swift-evolution mailing list
> [email protected]
> https://lists.swift.org/mailman/listinfo/swift-evolution
_______________________________________________
swift-evolution mailing list
[email protected]
https://lists.swift.org/mailman/listinfo/swift-evolution
