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.NET Forum / Languages / Managed C++ / October 2005templates and managed code
Is there any plan to support templates with managed code in the (near) future? For instance, VS.NET 2005... : ) > Is there any plan to support templates with managed code in the (near) > future? For instance, VS.NET 2005... : ) Templates have always (i.e. from the VS 2002 / 7.0 version) been supported in managed code. Templates on CLR types are supported starting with the VS 2005 / 8.0 versions. Ronald Laeremans Visual C++ team template< int x > class X {} ; // just fine template< int y > __gc classY{} ; //error C3151 '__gc' can't be applied to a template What do you mean by 'templates have always been supported' if the simple code above generates an error specifically saying you can't use '__gc' with a template? [ I'm using the 2003 pro version of VC++.NET] I guess I don't know what a CLR type is... : ) >> Is there any plan to support templates with managed code in the (near) >> future? For instance, VS.NET 2005... : ) [quoted text clipped - 7 lines] > Ronald Laeremans > Visual C++ team > template< int x > > class X {} ; // just fine [quoted text clipped - 7 lines] > VC++.NET] > I guess I don't know what a CLR type is... : ) You can' declare managed template types, but you can use templates inside Managed C++ code (in non-gc types). Starting with VC2005 and CLI, you can use generics on managed types (although not really as powerful as templates, generics are a first step in the right direction). Arnaud MVP - VC Managed templates are supported starting VC++ 2005 (and I believe it's only for the new syntax). VC++ 2003 did not support managed templates. But, what Ronald meant is that your native templates would compile with /clr turned on - doesn't mean you can have __gc template classes.  SignatureRegards, Nish [VC++ MVP] > template< int x > > class X {} ; // just fine [quoted text clipped - 19 lines] >> Ronald Laeremans >> Visual C++ team Cool that it will be supported in 2005 (which will be released when? It's close to needing a name change to 2006...lol)... Will multiple-inheritance for managed (__gc) classes also be supported perchance? In this case I would assume, if it's allowed at all, that when creating a new managed multiple-inheritance class it would allow the use of only *managed* base classes as parents... Or is there a way to do managed multiple-inheritance now? > Managed templates are supported starting VC++ 2005 (and I believe it's > only for the new syntax). [quoted text clipped - 26 lines] >>> Ronald Laeremans >>> Visual C++ team >Cool that it will be supported in 2005 (which will be released when? It's >close to needing a name change to 2006...lol)... See: http://lab.msdn.microsoft.com/vs2005/ The "Launch Tour" begins Nov 7, so I guess it'll all be available then. >Will multiple-inheritance for managed (__gc) classes also be supported >perchance? In this case I would assume, if it's allowed at all, that when >creating a new managed multiple-inheritance class it would allow the use of >only *managed* base classes as parents... > >Or is there a way to do managed multiple-inheritance now? The CLR allows a class to implement multiple interfaces, but it doesn't support multiple inheritance of classes. The new C++/CLI language follows the CLR WRT managed types. SignatureDoug Harrison Visual C++ MVP > Cool that it will be supported in 2005 Beware that managed generics are *NOT* templates, although the (unfortunately IMHO) share most of their syntax. Mainly, generics do not support specialization (partial or total), nor dependent types definition/inference. On the other side, generics use a mechanism to restrict what instanciations are authorized for a given "template". > Will multiple-inheritance for managed (__gc) classes also be supported > perchance? Managed C++ allows only interface multiple-inheritance and class single inheritance. Otherwise, it would be incompatible with other .NET langages and the .NET CLR. > Or is there a way to do managed multiple-inheritance now? You can multiple-inherits from interfaces. Implementation multiple-inheritance, although sometimes invaluable, should bu used only on rare occasions anyway (most of the time, using MI means that you are using inheritance for something else than the Liskov Substitution principle). Arnaud MVP - VC >Beware that managed generics are *NOT* templates, although the >(unfortunately IMHO) share most of their syntax. Mainly, generics do >not support specialization (partial or total), nor dependent types >definition/inference. On the other side, generics use a mechanism to >restrict what instanciations are authorized for a given "template". I wasn't talking about generics - I was talking about managed templates which support specialization, derivation from the template parameter type etc. SignatureRegards, Nish [VC++ MVP] http://www.voidnish.com http://blog.voidnish.com >> Cool that it will be supported in 2005 > [quoted text clipped - 19 lines] > Arnaud > MVP - VC >> Beware that managed generics are *NOT* templates, although the >> (unfortunately IMHO) share most of their syntax. Mainly, generics do [quoted text clipped - 5 lines] > templates which support specialization, derivation from the template > parameter type etc. I know, but I was not sure that Peter Oliphant was aware of the difference. Arnaud MVP - VC Hi Arnad, > I know, but I was not sure that Peter Oliphant was aware of the > difference. I wasn't till now, so thanx for info! In fact, thanks to all who have participated in this thread... : ) [==P==] >>> Beware that managed generics are *NOT* templates, although the >>> (unfortunately IMHO) share most of their syntax. Mainly, generics do [quoted text clipped - 11 lines] > Arnaud > MVP - VC Hey Peter See http://www.codeproject.com/managedcpp/whycppcli.asp See the section titled "Managed templates" SignatureRegards, Nish [VC++ MVP] > Is there any plan to support templates with managed code in the (near) > future? For instance, VS.NET 2005... : )
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