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Rex_chaos
Guest
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 Posted: Thu Oct 23, 2003 3:29 pm Post subject: about partial specialization |
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Hi there,
I am writing a template class like
template <class T, int rank>
class TC {...};
In my case, I would like to partial specialize the class.
template <class T>
class TC<T,1> {...};
template <class T>
class TC<T,2> {...};
template <class T>
class TC<T,2> {...};
Within each class, there is a little change. A particular function
will be added to the class and the implementation of some function
will also be modified. I wonder it it's necessary to "copy and paste"
all the code from the original template class to the specialized one.
It's very annoying if I have to.
For this purpose, I wonder if it's better to use the inheritance
instead.
template <class T>
class TCOne :public TC<T,1>
{...};
For my case, the efficiency is the most essential factor. Will it
lower the efficiency if I take the inheitance mechanism?
Thanks in advance.
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Gianni Mariani
Guest
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| Posted: Thu Oct 23, 2003 3:39 pm Post subject: Re: about partial specialization |
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Rex_chaos wrote:
....
| Quote: | For this purpose, I wonder if it's better to use the inheritance
instead.
template <class T
class TCOne :public TC
{...};
For my case, the efficiency is the most essential factor. Will it
lower the efficiency if I take the inheitance mechanism?
|
No. Inheritance has very low (if no) run time cost.
By the description, I thought you meant to do this.
template
class TC<T,1> : public BASE
{...};
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Grzegorz Sakrejda
Guest
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| Posted: Thu Oct 23, 2003 3:48 pm Post subject: Re: about partial specialization |
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On 23 Oct 2003 08:29:54 -0700, Rex_chaos <rex_chaos (AT) 21cn (DOT) com> wrote:
| Quote: | Hi there,
I am writing a template class like
template <class T, int rank
class TC {...};
In my case, I would like to partial specialize the class.
template
class TC
template <class T
class TC
template <class T
class TC
Within each class, there is a little change. A particular function
will be added to the class and the implementation of some function
will also be modified. I wonder it it's necessary to "copy and paste"
all the code from the original template class to the specialized one.
It's very annoying if I have to.
|
And it's a maintanance mess.
| Quote: |
For this purpose, I wonder if it's better to use the inheritance
instead.
|
Separate repeated code and put it into the base class.
| Quote: |
template <class T
class TCOne :public TC
For my case, the efficiency is the most essential factor. Will it
lower the efficiency if I take the inheitance mechanism?
I don't think so. |
| Quote: |
Thanks in advance.
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You also could use macro to avoid repeating code.
It's ugly but if there is nothing better why not use it.
--
grzegorz
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stephan beal
Guest
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| Posted: Fri Oct 24, 2003 8:40 am Post subject: Re: about partial specialization |
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Gianni Mariani wrote:
| Quote: | template <class T
class TCOne :public TC
{...};
....
By the description, I thought you meant to do this.
template
class TC
{...};
|
No, he means for a specialization to subclass the class template which it is
specializing. Convoluted, perhaps, but i've done this in the past as well.
e.g.,
template <class SerializableType,class NodeType = s11n::s11n_node>
class serializable_adapter
{
....
};
/**
Quasi-bogus specialization to accomodate usage of, e.g.,
container::value_type as a SerializableType parameter.
This feature is used by, e.g., de/serialize_{map,list}() to
strip the pointer part from value_type so it can be re-used
as a template parameter for other functions.
*/
template <class SerializableType,class NodeType>
class serializable_adapter<SerializableType *,NodeType> : public
serializable_adapter <SerializableType,NodeType>{};
So, in end effect this causes pointer and non-pointer SerializableTypes to
be treated identically (at least in the cases i've had so far).
--
----- stephan beal
Registered Linux User #71917 http://counter.li.org
I speak for myself, not my employer. Contents may
be hot. Slippery when wet. Reading disclaimers makes
you go blind. Writing them is worse. You have been Warned.
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