dev-cpp-users

[Dev-C++] Using Templates & Constructors

[w0rldd0m <dg...@wo...>]

Hi,
 
Thanks in advance for any help you can offer. 
 
Im trying to use a template class and I keep making mistakes. So now I am
trying to create an isolated case, but its still broke.
Please can anyone help me solve this? Here are the compiler errors that I
get:
 
_______________
 \myFolder\myClass.cpp In constructor `myClass<Type>::myClass(const Type&)':

7 \myFolder\myClass.cpp syntax error before `;' token 
\myFolder\Makefile.win [Build Error]  [myClass.o] Error 1 
_______________
 
Here is my main.cpp code:
_______________
#include <iostream>
#include <stdlib.h>
#include "myClass.h"
 
using namespace std;
 
int main(int argc, char *argv[])
{
  myClass<int> test(5);
  
  system("PAUSE"); 
  return 0;
}
__________________
 
Here is my myClass.h code:
__________________
#include <iostream>
#ifndef H_MYCLASS
#define H_MYCLASS
 
template<class Type>
class myClass
{
public:
    //Default Constructor
    myClass(const Type &item);
protected:        
    Type count;
};            
#endif
_____________________
 
Lastly, here is my myClass.cpp code:
_____________________
#include <iostream>
#include "myClass.h"
 
template<class Type>
myClass<Type>::myClass(const Type &item) //default constructor
{
  count = new Type item;
}
______________________
 
 
 
Best regards,
Dane
 

Re: [Dev-C++] Using Templates & Constructors

[Siva C. <siv...@ya...>]

Hello, 

As we can see the compiler complains about the class
definition in the *.cpp file.

>  \myFolder\myClass.cpp In constructor
> `myClass<Type>::myClass(const Type&)':
> 
> 7 \myFolder\myClass.cpp syntax error before `;'
> token 
> \myFolder\Makefile.win [Build Error]  [myClass.o]
> Error 1 

And, the complaint is about the way you have created a
new myClass object. Firtsly, you have declared a
protected member object of type Type in the class
declaration and not a pointer to an object of type
Type. So I guess the declaration code should be
changed to:

Type* count; // Declare count as a pointer.

Next, even after making such a correction, the way you
should go about initialising this object is:

count = new Type(item);

and not as:

count = new Type item;

Even here, the class of type Type should have a
logically correct copy constructor.

> Lastly, here is my myClass.cpp code:
> _____________________
> #include <iostream>
> #include "myClass.h"
>  
> template<class Type>
> myClass<Type>::myClass(const Type &item) //default
> constructor
> {
>   count = new Type item;
> }

Hope this helps,
Siva Chandra



		
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