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Oct 10th, 2008

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

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I create the simple template structure like this

C++ Syntax (Toggle Plain Text)
#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;
}
#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

C++ Syntax (Toggle Plain Text)

typedef box square;

But i didn't workout... Please help me..

Last edited by Rhohitman; Oct 10th, 2008 at 2:34 am. Reason: mistakely pressed tab and enter.. as it was summited without completion

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Oct 10th, 2008

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

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.

dougy83

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Oct 10th, 2008

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

Click to Expand / Collapse Quote originally posted by dougy83 ...

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

Rhohitman

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Oct 10th, 2008

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

What's a problem?

C++ Syntax (Toggle Plain Text)

typedef box<int> MyFavouriteBoxType;
...
MyFavouriteBoxType b1;

Look at STL headers on you C++ installation. There are lots of (useful) typedefs in STL templates...

ArkM

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Oct 10th, 2008

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

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)

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 11:23 am.

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Oct 10th, 2008

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

Click to Expand / Collapse Quote originally posted by ArkM ...

What's a problem?
C++ Syntax (Toggle Plain Text)
typedef box<int> MyFavouriteBoxType;
...
MyFavouriteBoxType b1;
typedef box<int> MyFavouriteBoxType; ... 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 12:59 pm.

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Oct 10th, 2008

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

Click to Expand / Collapse Quote originally posted by gregorynoob ...

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)
typedef my_monumental_structure<another_huge_type>::iterator sit;
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 1:51 pm.

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Oct 10th, 2008

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

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"?

ArkM

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Oct 10th, 2008

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

I believe he's trying to do something like:

C++ Syntax (Toggle Plain Text)

typedef box MyGreatBeautifulBox;
 
//and use it as:
MyGreatBeutifulBox<int> a;
MyGreatBeutifulBox<char>b;

I don't think it can be done

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Oct 10th, 2008

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

Hehe...

C++ Syntax (Toggle Plain Text)
template<typename T> 
struct MyGreatBeautifulBox:box<T>{};
 
int main()
{
    MyGreatBeautifulBox<int>  ibox;
    MyGreatBeautifulBox<char> cbox;
template<typename T> 
struct MyGreatBeautifulBox:box<T>{};

int main()
{
    MyGreatBeautifulBox<int>  ibox;
    MyGreatBeautifulBox<char> cbox;

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