Check generic subclass in Swift
1
I have the following function in swift:
func test<C1,C2>(val1: C1, val2: C2) {
}
But I want to use where to constraint this function to when C2 is subclass of C1. I tried something like this:
func test<C1,C2>(val1: C1, val2: C2) where C2: C1 {
}
But it does not work and gives an error as Type 'C2' constraint to non-protocol, non-class type 'C1'. Any idea how I should do it?
swift generics
asked Dec 31 '18 at 8:37
AfshinAfshin
3,0361625
|
show 1 more comment
1
I have the following function in swift:
func test<C1,C2>(val1: C1, val2: C2) {
}
But I want to use where to constraint this function to when C2 is subclass of C1. I tried something like this:
func test<C1,C2>(val1: C1, val2: C2) where C2: C1 {
}
But it does not work and gives an error as Type 'C2' constraint to non-protocol, non-class type 'C1'. Any idea how I should do it?
swift generics
asked Dec 31 '18 at 8:37
AfshinAfshin
3,0361625
Please check this one. I hope it's help you: dispatchswift.com/…
– Sagar Chauhan
Dec 31 '18 at 8:56
@SagarChauhan sadly my problem is not covered in it. Even thoughC: SomeClassshould be available for check ifCis subclass ofSomeClass, it seems it does not work ifSomeClassitself is a generic parameter like my problem.
– Afshin
Dec 31 '18 at 9:01
i think it is not possible!!
– SPatel
Dec 31 '18 at 9:26
Why do you need this constraint? What do you want to implement?
– Qbyte
Dec 31 '18 at 13:56
2
@Afshin Could you give a more specific example what you want to do? Is it maybe possible to do this with protocols since this function now only works with classes and not with structs and enums?
– Qbyte
Dec 31 '18 at 15:17
|
show 1 more comment
1
1
1
5
I have the following function in swift:
func test<C1,C2>(val1: C1, val2: C2) {
}
But I want to use where to constraint this function to when C2 is subclass of C1. I tried something like this:
func test<C1,C2>(val1: C1, val2: C2) where C2: C1 {
}
But it does not work and gives an error as Type 'C2' constraint to non-protocol, non-class type 'C1'. Any idea how I should do it?
swift generics
asked Dec 31 '18 at 8:37
AfshinAfshin
3,0361625
I have the following function in swift:
func test<C1,C2>(val1: C1, val2: C2) {
}
But I want to use where to constraint this function to when C2 is subclass of C1. I tried something like this:
func test<C1,C2>(val1: C1, val2: C2) where C2: C1 {
}
But it does not work and gives an error as Type 'C2' constraint to non-protocol, non-class type 'C1'. Any idea how I should do it?
swift generics
swift generics
asked Dec 31 '18 at 8:37
AfshinAfshin
3,0361625
asked Dec 31 '18 at 8:37
AfshinAfshin
3,0361625
edited Dec 31 '18 at 16:15
Afshin
asked Dec 31 '18 at 8:37
AfshinAfshin
3,0361625
asked Dec 31 '18 at 8:37
AfshinAfshin
3,0361625
asked Dec 31 '18 at 8:37
AfshinAfshin
3,0361625
3,0361625
Please check this one. I hope it's help you: dispatchswift.com/…
– Sagar Chauhan
Dec 31 '18 at 8:56
@SagarChauhan sadly my problem is not covered in it. Even thoughC: SomeClassshould be available for check ifCis subclass ofSomeClass, it seems it does not work ifSomeClassitself is a generic parameter like my problem.
– Afshin
Dec 31 '18 at 9:01
i think it is not possible!!
– SPatel
Dec 31 '18 at 9:26
Why do you need this constraint? What do you want to implement?
– Qbyte
Dec 31 '18 at 13:56
2
@Afshin Could you give a more specific example what you want to do? Is it maybe possible to do this with protocols since this function now only works with classes and not with structs and enums?
– Qbyte
Dec 31 '18 at 15:17
|
show 1 more comment
Please check this one. I hope it's help you: dispatchswift.com/…
– Sagar Chauhan
Dec 31 '18 at 8:56
@SagarChauhan sadly my problem is not covered in it. Even thoughC: SomeClassshould be available for check ifCis subclass ofSomeClass, it seems it does not work ifSomeClassitself is a generic parameter like my problem.
– Afshin
Dec 31 '18 at 9:01
i think it is not possible!!
– SPatel
Dec 31 '18 at 9:26
Why do you need this constraint? What do you want to implement?
– Qbyte
Dec 31 '18 at 13:56
2
@Afshin Could you give a more specific example what you want to do? Is it maybe possible to do this with protocols since this function now only works with classes and not with structs and enums?
– Qbyte
Dec 31 '18 at 15:17
Please check this one. I hope it's help you: dispatchswift.com/…
– Sagar Chauhan
Dec 31 '18 at 8:56
Please check this one. I hope it's help you: dispatchswift.com/…
– Sagar Chauhan
Dec 31 '18 at 8:56
@SagarChauhan sadly my problem is not covered in it. Even though
C: SomeClass should be available for check if C is subclass of SomeClass, it seems it does not work if SomeClass itself is a generic parameter like my problem.– Afshin
Dec 31 '18 at 9:01
@SagarChauhan sadly my problem is not covered in it. Even though
C: SomeClass should be available for check if C is subclass of SomeClass, it seems it does not work if SomeClass itself is a generic parameter like my problem.– Afshin
Dec 31 '18 at 9:01
i think it is not possible!!
– SPatel
Dec 31 '18 at 9:26
i think it is not possible!!
– SPatel
Dec 31 '18 at 9:26
Why do you need this constraint? What do you want to implement?
– Qbyte
Dec 31 '18 at 13:56
Why do you need this constraint? What do you want to implement?
– Qbyte
Dec 31 '18 at 13:56
2
2
@Afshin Could you give a more specific example what you want to do? Is it maybe possible to do this with protocols since this function now only works with classes and not with structs and enums?
– Qbyte
Dec 31 '18 at 15:17
@Afshin Could you give a more specific example what you want to do? Is it maybe possible to do this with protocols since this function now only works with classes and not with structs and enums?
– Qbyte
Dec 31 '18 at 15:17
|
show 1 more comment
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53985281%2fcheck-generic-subclass-in-swift%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
draft saved
draft discarded
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53985281%2fcheck-generic-subclass-in-swift%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Please check this one. I hope it's help you: dispatchswift.com/…
– Sagar Chauhan
Dec 31 '18 at 8:56
@SagarChauhan sadly my problem is not covered in it. Even though
C: SomeClassshould be available for check ifCis subclass ofSomeClass, it seems it does not work ifSomeClassitself is a generic parameter like my problem.– Afshin
Dec 31 '18 at 9:01
i think it is not possible!!
– SPatel
Dec 31 '18 at 9:26
Why do you need this constraint? What do you want to implement?
– Qbyte
Dec 31 '18 at 13:56
2
@Afshin Could you give a more specific example what you want to do? Is it maybe possible to do this with protocols since this function now only works with classes and not with structs and enums?
– Qbyte
Dec 31 '18 at 15:17