Mixing
Widening conversion operator VB.NET
I have a class named Foo with properties like this:
Public Class Foo(Of T)
public Property Value as T
public Property Bar as Boolean
End Class
I have a type conversion function overload :
Public Shared Narrowing Operator CType(ins As [Foo](Of T)) As T
Return ins.Value
End Operator
Public Shared Widening Operator CType(prop As T) As [Foo](Of T)
Return New Foo(Of T) With {.Value = prop}
End Operator
I using my class like this:
private Sub someSub()
Dim f as new Foo(of String)
f.Bar = True
f = "This is The Text"
// when doing this I lose the `Bar` beacuase of `Return New Foo(Of T) With {.Value = rightSide}` on `Widening` overload
End Sub
is there any way to keep other properties of the class?
vb.net type-conversion
asked Nov 22 '18 at 6:47
ArsalanArsalan
3611520
add a comment |
I have a class named Foo with properties like this:
Public Class Foo(Of T)
public Property Value as T
public Property Bar as Boolean
End Class
I have a type conversion function overload :
Public Shared Narrowing Operator CType(ins As [Foo](Of T)) As T
Return ins.Value
End Operator
Public Shared Widening Operator CType(prop As T) As [Foo](Of T)
Return New Foo(Of T) With {.Value = prop}
End Operator
I using my class like this:
private Sub someSub()
Dim f as new Foo(of String)
f.Bar = True
f = "This is The Text"
// when doing this I lose the `Bar` beacuase of `Return New Foo(Of T) With {.Value = rightSide}` on `Widening` overload
End Sub
is there any way to keep other properties of the class?
vb.net type-conversion
asked Nov 22 '18 at 6:47
ArsalanArsalan
3611520
add a comment |
I have a class named Foo with properties like this:
Public Class Foo(Of T)
public Property Value as T
public Property Bar as Boolean
End Class
I have a type conversion function overload :
Public Shared Narrowing Operator CType(ins As [Foo](Of T)) As T
Return ins.Value
End Operator
Public Shared Widening Operator CType(prop As T) As [Foo](Of T)
Return New Foo(Of T) With {.Value = prop}
End Operator
I using my class like this:
private Sub someSub()
Dim f as new Foo(of String)
f.Bar = True
f = "This is The Text"
// when doing this I lose the `Bar` beacuase of `Return New Foo(Of T) With {.Value = rightSide}` on `Widening` overload
End Sub
is there any way to keep other properties of the class?
vb.net type-conversion
asked Nov 22 '18 at 6:47
ArsalanArsalan
3611520
I have a class named Foo with properties like this:
Public Class Foo(Of T)
public Property Value as T
public Property Bar as Boolean
End Class
I have a type conversion function overload :
Public Shared Narrowing Operator CType(ins As [Foo](Of T)) As T
Return ins.Value
End Operator
Public Shared Widening Operator CType(prop As T) As [Foo](Of T)
Return New Foo(Of T) With {.Value = prop}
End Operator
I using my class like this:
private Sub someSub()
Dim f as new Foo(of String)
f.Bar = True
f = "This is The Text"
// when doing this I lose the `Bar` beacuase of `Return New Foo(Of T) With {.Value = rightSide}` on `Widening` overload
End Sub
is there any way to keep other properties of the class?
vb.net type-conversion
vb.net type-conversion
asked Nov 22 '18 at 6:47
ArsalanArsalan
3611520
asked Nov 22 '18 at 6:47
ArsalanArsalan
3611520
asked Nov 22 '18 at 6:47
ArsalanArsalan
3611520
asked Nov 22 '18 at 6:47
ArsalanArsalan
3611520
asked Nov 22 '18 at 6:47
ArsalanArsalan
3611520
3611520
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
How could there be? When you assign to f you are creating a new Foo(Of T) object that knows nothing about the Bar property of the object already assigned to that variable. You'd have to set the Bar property of the new object inside the operator but it knows nothing about the variable you're assigning the result to so it can't get that value either. To keep that property value you would have to first get it and you have no way to get it other than the obvious manual retrieval beforehand and manual resetting afterwards.
answered Nov 22 '18 at 7:05
jmcilhinneyjmcilhinney
26k22032
add a comment |
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
});
}
});
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%2f53425277%2fwidening-conversion-operator-vb-net%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
How could there be? When you assign to f you are creating a new Foo(Of T) object that knows nothing about the Bar property of the object already assigned to that variable. You'd have to set the Bar property of the new object inside the operator but it knows nothing about the variable you're assigning the result to so it can't get that value either. To keep that property value you would have to first get it and you have no way to get it other than the obvious manual retrieval beforehand and manual resetting afterwards.
answered Nov 22 '18 at 7:05
jmcilhinneyjmcilhinney
26k22032
add a comment |
How could there be? When you assign to f you are creating a new Foo(Of T) object that knows nothing about the Bar property of the object already assigned to that variable. You'd have to set the Bar property of the new object inside the operator but it knows nothing about the variable you're assigning the result to so it can't get that value either. To keep that property value you would have to first get it and you have no way to get it other than the obvious manual retrieval beforehand and manual resetting afterwards.
answered Nov 22 '18 at 7:05
jmcilhinneyjmcilhinney
26k22032
add a comment |
How could there be? When you assign to f you are creating a new Foo(Of T) object that knows nothing about the Bar property of the object already assigned to that variable. You'd have to set the Bar property of the new object inside the operator but it knows nothing about the variable you're assigning the result to so it can't get that value either. To keep that property value you would have to first get it and you have no way to get it other than the obvious manual retrieval beforehand and manual resetting afterwards.
answered Nov 22 '18 at 7:05
jmcilhinneyjmcilhinney
26k22032
How could there be? When you assign to f you are creating a new Foo(Of T) object that knows nothing about the Bar property of the object already assigned to that variable. You'd have to set the Bar property of the new object inside the operator but it knows nothing about the variable you're assigning the result to so it can't get that value either. To keep that property value you would have to first get it and you have no way to get it other than the obvious manual retrieval beforehand and manual resetting afterwards.
answered Nov 22 '18 at 7:05
jmcilhinneyjmcilhinney
26k22032
answered Nov 22 '18 at 7:05
jmcilhinneyjmcilhinney
26k22032
answered Nov 22 '18 at 7:05
jmcilhinneyjmcilhinney
26k22032
answered Nov 22 '18 at 7:05
jmcilhinneyjmcilhinney
26k22032
26k22032
add a comment |
add a comment |
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.
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%2f53425277%2fwidening-conversion-operator-vb-net%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
