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Template classes

Started by Lazy303 Dec 19, 2002 at 1:57 PM 11 replies 250+ views

Original Post

Dec 19, 2002 at 1:57 PM

Hi! I've written a template class for linked lists. But Now I want to create a new template class that uses the linked list class, but it doesn't work These are my tree classes :

  
template<class E> class CFreeList
template<class E> class CFreeListChunk
template<class T> class CLinkedList

In the CFreeList class I have a member :

CLinkedList<CFreeListChunk<E>>	m_oChunkList;

But i get this error cfreelist.h(55) : error C2146: syntax error : missing ',' before identifier 'm_oChunkList' Hmm.. havn't got a clue... plz help! /lazy [edited by - lazy303 on December 19, 2002 3:27:18 PM]

Dec 19, 2002 at 2:07 PM

you should probably pass some argument(s) to the template like

CLinkedList m_oChunkList;

Miserable

Dec 19, 2002 at 2:11 PM

Please, use [ source ] boxes when posting templated code. Browsers make the template arguments disappear.

Dec 19, 2002 at 2:17 PM

shit...

if it''s like this

  
CLinkedList<T> m_oChunkList;

your CLinkedList - template may need more than one argument ...

Dec 19, 2002 at 2:21 PM

Lazy303, please do what Miserable says

  
CLinkedList<CFreeListChunk<E>> m_oChunkList;

how did you declare CFreeListChunk and CLinkedList???

Miserable

Dec 19, 2002 at 2:24 PM

quote:
Original post by Lazy303
The forum removes some of my text!

I repeat: Put your code in source boxes. You do so by using the forum tags (in square brackets) [ source ] and [ /source ] (though without the spaces in the tags, which I insert only to prevent them from turning up as a source box instead of text).

I also suggest you glance at the forum FAQ''s ...

Lazy303

Author

Lazy303

Dec 19, 2002 at 2:25 PM

umm.. How do I use those edit boxes?

  

template<class E> class CFreeList
{
  stuff

  CLinkedList<CFreeListChunk<E>> m_oChunkList;
}

template<class E> class CFreeListChunk
{
  stuff
}

template<class T> class CLinkedList
{
  stuff
}

[edited by - lazy303 on December 19, 2002 3:26:05 PM]

fup

Dec 19, 2002 at 2:33 PM

shouldn''t that be:

  
CLinkedList<CFreeListChunk<E> > m_oChunkList;

you have to leave a space between the angled brackets or the compiler thinks you''re using the >> operator.

ai-junkie.com

BitMaster

131

BitMaster

Dec 19, 2002 at 2:33 PM

I think some C++ compilers have problems with using a double ">" for templates. Try to insert a space between them, otherwise they might be confused with the shift operator.

Dec 19, 2002 at 2:46 PM

yep... you''re right ... vc++ can''t handle that... (and I think Lazy303 uses vc++ because of the error message...)

quote:
Original post by BitMaster
I think some C++ compilers have problems with using a double ">" for templates. Try to insert a space between them, otherwise they might be confused with the shift operator.

Lazy303

Author

Lazy303

Dec 19, 2002 at 3:12 PM

Thanks!

It was the >> error...

Damn, now when I think about it... I''ve had this problem
before... I never learn...

Oluseyi

526

Oluseyi

Dec 19, 2002 at 4:24 PM

quote:
Original post by Miserable
I repeat: Put your code in source boxes. You do so by using the forum tags (in square brackets) [ source ] and [ /source ] (though without the spaces in the tags, which I insert only to prevent them from turning up as a source box instead of text).

I also suggest you glance at the forum FAQ's ...

It's actually a little more involved than that.

[source] tags place syntax highlighted text in a white box and do not attempt to interpret angular brackets-enclosed as HTML. Like [code] tags, they also display text in monospace font. Unfortunately, the [source] box is rather large for less than say 10 lines of code. To correctly show angular brackets in regular text (including [code] tags-enclosed text), use the HTML entity < and for the opening bracket. Here's a couple of examples:


template < typename T >
ATemplateClassInPlainText
{
  ...
};

The advantage of the [code] tag is that it maintains whitespace (indenting, etc), which the [source] tag does as well.

How did I write [source] and [code] without the spaces and without the board interpreting them as tags? I used the HTML entity for a left square bracket - ] And how did I get this spiffy small grey text? I used the GDNet editedby style: <span class="editedby"> text here </span>

[Edit: Darnit! Used the wrong entity.]

[edited by - Oluseyi on December 19, 2002 5:27:18 PM]

LilBudyWizer

145

LilBudyWizer

Dec 19, 2002 at 8:21 PM

">>" being interpretted as shift is not an error in the compiler. That is the standard.

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