template and dynamic polymorphism

[Jun]

struct Abstract{

virtual void run() const = 0;

};

template <typename T>
struct S : F{
void run(){}
};


I just want to use as :

Abstract* a = new S<policy_1>(); // doesn't work


I just wanna to know how i could mix the templates with the
traditional abstract class design, thank you in advance.

 

[Jun]

Sorry, the code is :

 

[Jun]

* Jun:








How about deriving S from Abstract.

Cheers, & hth.,

- Alf

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Sorry, my code is actually :

struct S : Abstract // and still doesn't work

 

[Leandro Melo]

Sorry, the code is :

You get the error because you're hidding run() from class abstract (in
S you're not making the function const). Try this:
template <typename T>
struct S : Abstract
{
void run()const {} //Notice the const at the end.
};

 

[Rolf Magnus]

* Jun:

How about deriving S from Abstract.

Another thing that comes to mind would be to make run() in S const, like in
Abstract, as well as telling, what "doesn't work" exactly means in this
case.

 

[Jun]

Another thing that comes to mind would be to make run() in S const, like in
Abstract, as well as telling, what "doesn't work" exactly means in this
case.

Thanks a lot, after changing the run as const in S, it works fine.

 

[Noah Roberts]

Thanks a lot, after changing the run as const in S, it works fine.

This will repeatedly mess with you. Make it the first thing you check.