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SMS(student managent system)

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WondererAbu WondererAbu is offline

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SMS(student managent system)

May 12th, 2008

Can you explain me how to link classes with each other?

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Agni

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Re: SMS(student managent system)

May 12th, 2008

... dude.... what do you mean by 'link classes' ?

thanks
-chandra

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Re: SMS(student managent system)

May 12th, 2008

You could use a std::vector, or std::list, or write your own linked list. If that isn't what you want then we have no idea what you mean.

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

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vijayan121 vijayan121 is offline

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Re: SMS(student managent system)

May 12th, 2008

> how to link classes with each other?
classes are types. are you looking for how to implement a typelist?
a tutorial introduction to typelists: http://www.ddj.com/cpp/184403813?_requestid=1305388
you might then want to read Alexandrescu's Modern C++ Design (Addison-Wesley Longman, 2001).
and look up Boost.MPL http://www.boost.org/doc/libs/1_35_0...doc/index.html which has a ready made framework for template metaprogramming. eg.

 Help with Code Tags 
 c++ Syntax (Toggle Plain Text) 
#include <boost/mpl/vector.hpp>
#include <boost/mpl/push_front.hpp>
#include <boost/mpl/push_back.hpp>
#include <boost/mpl/replace.hpp>
#include <boost/mpl/at.hpp>
#include <boost/mpl/int.hpp>
#include <boost/mpl/assert.hpp>
 
class A{} ; class B{} ; class C{} ; class D{} ; class E{} ;
 
int main()
{
  using namespace boost ;
 
  typedef mpl::vector<A,B> seq_ab ;
  typedef mpl::push_front< seq_ab, C >::type seq_cab ;
  typedef mpl::push_back< seq_cab, D >::type seq_cabd ;
  typedef mpl::replace< seq_cabd, B, E >::type seq_caed ;
 
  BOOST_MPL_ASSERT(
   ( mpl::is_same< mpl::at< seq_caed, mpl::int_<2> >, E > ) ) ;
}
#include <boost/mpl/vector.hpp>
#include <boost/mpl/push_front.hpp>
#include <boost/mpl/push_back.hpp>
#include <boost/mpl/replace.hpp>
#include <boost/mpl/at.hpp>
#include <boost/mpl/int.hpp>
#include <boost/mpl/assert.hpp>

class A{} ; class B{} ; class C{} ; class D{} ; class E{} ;

int main()
{
  using namespace boost ;

  typedef mpl::vector<A,B> seq_ab ;
  typedef mpl::push_front< seq_ab, C >::type seq_cab ;
  typedef mpl::push_back< seq_cab, D >::type seq_cabd ;
  typedef mpl::replace< seq_cabd, B, E >::type seq_caed ;

  BOOST_MPL_ASSERT(
   ( mpl::is_same< mpl::at< seq_caed, mpl::int_<2> >, E > ) ) ;
}

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WondererAbu WondererAbu is offline

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Re: SMS(student managent system)

May 19th, 2008

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Originally Posted by Agni

... dude.... what do you mean by 'link classes' ?

There are many classes which must be link or in other words put together in order to work as one big class.

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Re: SMS(student managent system)

May 19th, 2008

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Originally Posted by WondererAbu

There are many classes which must be link or in other words put together in order to work as one big class.

Oh, do you mean inheritence?

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
class base
{
   // blabla
};
 
class derived : public base
{
    // linked (derived) class
};
class base
{
   // blabla
};

class derived : public base
{
    // linked (derived) class
};

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

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ithelp

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Re: SMS(student managent system)

May 19th, 2008

I guess you mean

 Help with Code Tags 
 c++ Syntax (Toggle Plain Text) 
class A { 
 
};
class B {
A a;
};
class A { 

};
class B {
A a;
};

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RenjithVR

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Re: SMS(student managent system)

May 20th, 2008

I think you are thinking about including a file in another file. Write a main function in one file and include the needed header files with that file. Also in each class include the header files they required. The below link will give you a small idea about this.
http://www.eventhelix.com/RealTimeMa...dePatterns.htm

To compile these classes its better to use a Makefile. The following link will guide through how to write and use a Makefile.
http://www.sethi.org/classes/cet375/...mpilation.html

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Agni

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Re: SMS(student managent system)

May 20th, 2008

Are we playing 'Read My Mind' here

...

thanks
-chandra

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Re: SMS(student managent system)

#10

May 20th, 2008

•

Originally Posted by Agni

Are we playing 'Read My Mind' here ...

In theory, if we supplied ∞ answers, the right one would be among them

So I'll have a look in my crystal ball and say....: Namespaces!

 Help with Code Tags 
 cpp Syntax (Toggle Plain Text) 
#include <iostream>
 
namespace ClassSpace
{
	class a 
	{
	public:
	    a()	{ std::cout << "Created A\n";}
	    ~a(){ }
	};
	class b 
	{
	public:
	    b(){  std::cout << "Created B\n";}
	    ~b(){}
	};
}
 
int main()
{
	ClassSpace::a Ca;
	ClassSpace::b Cb;
	std::cin.get();
	return 0;
}
#include <iostream>

namespace ClassSpace
{
	class a 
	{
	public:
	    a()	{ std::cout << "Created A\n";}
	    ~a(){ }
	};
	class b 
	{
	public:
	    b(){  std::cout << "Created B\n";}
	    ~b(){}
	};
}

int main()
{
	ClassSpace::a Ca;
	ClassSpace::b Cb;
	std::cin.get();
	return 0;
}