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Guest
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 Posted: Mon Jun 19, 2006 1:56 am Post subject: Define template parameter or just declare? |
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Hi,
I want to do something like this:
foo.h:
class FooData;
typedef MyTemplate<FooData> MyFoo;
class Foo2: public MyFoo {
// ...
};
foo.cpp:
class FooData {
// ...
};
Assume that MyTemplate only uses pointers to its template parameter and
never calls any methods on it (just passes pointers to it to other
routines/classes). I seem to remember reading that this won't work,
because you always have to define (not just declare) a class before you
use it as a template parameter. Is this right?
Cheers,
Jim |
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Ian Collins
Guest
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| Posted: Mon Jun 19, 2006 2:51 am Post subject: Re: Define template parameter or just declare? |
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quietbritishjim (AT) yahoo (DOT) co.uk wrote:
| Quote: | Hi,
I want to do something like this:
foo.h:
class FooData;
typedef MyTemplate<FooData> MyFoo;
class Foo2: public MyFoo {
// ...
};
foo.cpp:
class FooData {
// ...
};
Assume that MyTemplate only uses pointers to its template parameter and
never calls any methods on it (just passes pointers to it to other
routines/classes). I seem to remember reading that this won't work,
because you always have to define (not just declare) a class before you
use it as a template parameter. Is this right?
I don't think so, the class has to be in scope when the template is |
instantiated.
--
Ian Collins. |
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