Inherit from generic base type
in [CSharp]
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From: CSharpner on 14 May 2010 20:49 I was expecting the following code to work in C# 4.0: public class MyGenericType<T>: T { //... stuff ... } But it doesn't. Perhaps the syntax is different than what I'm attempting? Or is it just that it still hasn't been implemented and maybe in C# 5.0? http://books.google.com/books?id=kQTeadi7388C&pg=PA151&lpg=PA151&dq=%22cannot+derive+from+t+because+it+is+a+type+parameter%22&source=web&ots=8gMDRNdnWc&sig=FxdQ7oKM8iF67TYozJ1Hbm-CVqM#v=onepage&q=%22cannot%20derive%20from%20t%20because%20it%20is%20a%20type%20parameter%22&f=false
From: Arne Vajhøj on 14 May 2010 21:29 On 14-05-2010 20:49, CSharpner wrote: > I was expecting the following code to work in C# 4.0: > > public class MyGenericType<T>: T > { > //... stuff ... > } > > But it doesn't. > > Perhaps the syntax is different than what I'm attempting? Or is it > just that it still hasn't been implemented and maybe in C# 5.0? > > http://books.google.com/books?id=kQTeadi7388C&pg=PA151&lpg=PA151&dq=%22cannot+derive+from+t+because+it+is+a+type+parameter%22&source=web&ots=8gMDRNdnWc&sig=FxdQ7oKM8iF67TYozJ1Hbm-CVqM#v=onepage&q=%22cannot%20derive%20from%20t%20because%20it%20is%20a%20type%20parameter%22&f=false I don't think you can do that. There is a huge practical problem. Generic classes in C# get compiled as they are (unlike C++ templates that get compiled when they get used). It could be very difficult to compile something inheriting from something unknown. Arne
From: CSharpner on 15 May 2010 17:38 On May 14, 9:29 pm, Arne Vajhøj <a...(a)vajhoej.dk> wrote: > On 14-05-2010 20:49, CSharpner wrote: > > > I was expecting the following code to work in C# 4.0: > > > public class MyGenericType<T>: T > > { > > //... stuff ... > > } > > > But it doesn't. > > > Perhaps the syntax is different than what I'm attempting? Or is it > > just that it still hasn't been implemented and maybe in C# 5.0? > > >http://books.google.com/books?id=kQTeadi7388C&pg=PA151&lpg=PA151&dq=%... > > I don't think you can do that. > > There is a huge practical problem. Generic classes in C# > get compiled as they are (unlike C++ templates that > get compiled when they get used). It could be very > difficult to compile something inheriting from something unknown. > > Arne If they didn't implement it on usage, then yes, it would be difficult, if not impossible, BUT, there's nothing preventing them from implementing it a different way... They could generate it based on usage. So, the story line is that they will eventually implement it, so I was just checking to see if anyone knows if it's actually been implemented yet. If you don't know, that's OK.
From: Arne Vajhøj on 15 May 2010 17:42 On 15-05-2010 17:38, CSharpner wrote: > On May 14, 9:29 pm, Arne Vajh�j<a...(a)vajhoej.dk> wrote: >> On 14-05-2010 20:49, CSharpner wrote: >> >>> I was expecting the following code to work in C# 4.0: >> >>> public class MyGenericType<T>: T >>> { >>> //... stuff ... >>> } >> >>> But it doesn't. >> >>> Perhaps the syntax is different than what I'm attempting? Or is it >>> just that it still hasn't been implemented and maybe in C# 5.0? >> >>> http://books.google.com/books?id=kQTeadi7388C&pg=PA151&lpg=PA151&dq=%... >> >> I don't think you can do that. >> >> There is a huge practical problem. Generic classes in C# >> get compiled as they are (unlike C++ templates that >> get compiled when they get used). It could be very >> difficult to compile something inheriting from something unknown. > > If they didn't implement it on usage, then yes, it would be difficult, > if not impossible, BUT, there's nothing preventing them from > implementing it a different way... They could generate it based on > usage. So, the story line is that they will eventually implement it, > so I was just checking to see if anyone knows if it's actually been > implemented yet. If you don't know, that's OK. C#/.NET generic classes get compiled as other classes. Arne
From: Patrice on 16 May 2010 05:06
Hello, Your best bet could be to explain what you are trying to do... See perhaps if : http://www.eggheadcafe.com/software/aspnet/31868047/-inherit-from-generic.aspx could be a possible workaround for you... -- Patrice |