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How to use typedef for the template structure? What its syntax?

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How to use typedef for the template structure? What its syntax?

  #1  
Oct 10th, 2008
I create the simple template structure like this
#include <iostream>

template <class info>
struct box
{
	info data;
};

int main()
{
	box<int> b1;
	b1.data = 1;
	std::cout<<b1.data;
	return 0;typedef box square;
}

Now i want to use the typedef for this template structure.
I could not figure out the syntax...
as i tried 
typedef box square;

But i didn't workout... Please help me..
Last edited by Rhohitman : Oct 10th, 2008 at 1:34 am. Reason: mistakely pressed tab and enter.. as it was summited without completion
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Re: How to use typedef for the template structure? What its syntax?

  #2  
Oct 10th, 2008
I don't think it's in the language.
You could use #define square box.

You may want to google template typedefs, or check out http://www.gotw.ca/gotw/079.htm for some solutions.
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Re: How to use typedef for the template structure? What its syntax?

  #3  
Oct 10th, 2008
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Originally Posted by dougy83 View Post
I don't think it's in the language.
You could use #define square box.

You may want to google template typedefs, or check out http://www.gotw.ca/gotw/079.htm for some solutions.


Couldn't understand your like... but might come handy later... thanx
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Re: How to use typedef for the template structure? What its syntax?

  #4  
Oct 10th, 2008
What's a problem?
cplusplus Syntax (Toggle Plain Text) 
  1. typedef box<int> MyFavouriteBoxType;
  2. ...
  3. MyFavouriteBoxType b1;
Look at STL headers on you C++ installation. There are lots of (useful) typedefs in STL templates...
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Re: How to use typedef for the template structure? What its syntax?

  #5  
Oct 10th, 2008
yea, you gotta either macro it or typedef with specifying the actual template type sucks in a way... but hey, what's the deal with the box thing, it's pretty small and easy to write...
i use typedef for long, looooong names, like:
c++ Syntax (Toggle Plain Text) 
  1. typedef my_monumental_structure<another_huge_type>::iterator sit;
and then i just sit... all the way... rocks
Last edited by gregorynoob : Oct 10th, 2008 at 10:23 am.
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Re: How to use typedef for the template structure? What its syntax?

  #6  
Oct 10th, 2008
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Originally Posted by ArkM View Post
What's a problem?
cplusplus Syntax (Toggle Plain Text) 
  1. typedef box<int> MyFavouriteBoxType;
  2. ...
  3. MyFavouriteBoxType b1;
Look at STL headers on you C++ installation. There are lots of (useful) typedefs in STL templates...


Is there any possibilities to have generic type typedef. As normally typedef copies complete characteristics of it host.
Last edited by Rhohitman : Oct 10th, 2008 at 11:59 am.
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Re: How to use typedef for the template structure? What its syntax?

  #7  
Oct 10th, 2008
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Originally Posted by gregorynoob View Post
yea, you gotta either macro it or typedef with specifying the actual template type sucks in a way... but hey, what's the deal with the box thing, it's pretty small and easy to write...
i use typedef for long, looooong names, like:
c++ Syntax (Toggle Plain Text) 
  1. typedef my_monumental_structure<another_huge_type>::iterator sit;
and then i just sit... all the way... rocks


I didn't get what your syntax says.
Can you kindly explain it..
Last edited by Rhohitman : Oct 10th, 2008 at 12:51 pm.
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Re: How to use typedef for the template structure? What its syntax?

  #8  
Oct 10th, 2008
Typedef name is an alias for the type, it's not a new type name.
Can you explain what a problem are you trying to solve with "generic typedef"?
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Re: How to use typedef for the template structure? What its syntax?

  #9  
Oct 10th, 2008
I believe he's trying to do something like:
cplusplus Syntax (Toggle Plain Text) 
  1. typedef box MyGreatBeautifulBox;
  2.  
  3. //and use it as:
  4. MyGreatBeutifulBox<int> a;
  5. MyGreatBeutifulBox<char>b;

I don't think it can be done
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Re: How to use typedef for the template structure? What its syntax?

  #10  
Oct 10th, 2008
Hehe...
cplusplus Syntax (Toggle Plain Text) 
  1. template<typename T> 
  2. struct MyGreatBeautifulBox:box<T>{};
  3.  
  4. int main()
  5. {
  6.     MyGreatBeautifulBox<int>  ibox;
  7.     MyGreatBeautifulBox<char> cbox;
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