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digitalmars.D - Class Tempates

reply Ark <Ark_member pathlink.com> writes:
Hello, 

How do you use template class instance ? 
For instance how do you translate this generic stack template ? 

Thanks,
Ark

-----------------------
template <class T> class Stack 
{
public:
Stack() { top = -1; }
void push(T i)
{ st[++top] = i; }
T pop()
{ return st[top--]; }
private:
int top;
T st[100];
};

int main ()
{
Stack<int> ii;
Stack<string> ss;
ii.push(25);
ss.push("Hello");
}
Apr 02 2006
parent reply Frank Benoit <benoit__ __tionex.de> writes:
Haven't compiled it. But should work.

class Stack (T)
{
public:
	this() { top = -1; }
	void push(T i)
	{ st[++top] = i; }
	T pop()
	{ return st[top--]; }
private:
	int top;
	T[100] st;
};

int main ( char[][] args)
{
auto ii = new Stack!(int);
auto ss = Stack!(char[]);
ii.push(25);
ss.push("Hello");
return 0;
}
Apr 02 2006
parent reply Ark <Ark_member pathlink.com> writes:
Hello Frank,

It works ! 

I realize now that i missed two points :
First i used template Stack (T) instead of class Stack(T)
Second i missed the auto keyword...

Thanks.
Apr 02 2006
parent reply Frank Benoit <benoit__ __tionex.de> writes:
Ark schrieb:

 Hello Frank,
 
 It works ! 
 
 I realize now that i missed two points :
 First i used template Stack (T) instead of class Stack(T)
 Second i missed the auto keyword...
 
 Thanks.
 
 



You can also write this without auto and with template:
template(T)
{
	class Stack
	{
	public:
		this() {
			top = -1;
		}
		void push(T i){
			st[++top] = i;
		}
		T pop(){
			return st[top--];
		}
	private:
		int top;
		T[100] st;
	}
}

int main ( char[][] args)
{
	alias Stack!(int)    StackI;
	alias Stack!(char[]) StackS;
	StackI ii = new StackI;
	StackS ss = StackS;
	ii.push(25);
	ss.push("Hello");
	return 0;
}

For more information see:
http://www.digitalmars.com/d/template.html
Apr 02 2006
parent reply Kyle Furlong <kylefurlong gmail.com> writes:
Frank Benoit wrote:

 Ark schrieb:

 Hello Frank,

 It works ! 

 I realize now that i missed two points :
 First i used template Stack (T) instead of class Stack(T)
 Second i missed the auto keyword...

 Thanks.



 You can also write this without auto and with template:
 template(T)
 {
 	class Stack
 	{
 	public:
 		this() {
 			top = -1;
 		}
 		void push(T i){
 			st[++top] = i;
 		}
 		T pop(){
 			return st[top--];
 		}
 	private:
 		int top;
 		T[100] st;
 	}
 }
 
 int main ( char[][] args)
 {
 	alias Stack!(int)    StackI;
 	alias Stack!(char[]) StackS;
 	StackI ii = new StackI;
 	StackS ss = StackS;



Wait, does this work now? I though we didn't have stack based classes yet.


 	ii.push(25);
 	ss.push("Hello");
 	return 0;
 }
 
 For more information see:
 http://www.digitalmars.com/d/template.html
Apr 02 2006
next sibling parent "Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:
"Kyle Furlong" <kylefurlong gmail.com> wrote in message 
news:e0pj2h$1c8r$1 digitaldaemon.com...

 Wait, does this work now? I though we didn't have stack based classes yet.



Haha :)

Wrong kind of stack.  This is just a stack data structure.  We don't have 
classes which can be allocated on the program stack.
Apr 02 2006
prev sibling parent Frank Benoit <benoit__ __tionex.de> writes:
     StackS ss = StackS;



 Wait, does this work now? I though we didn't have stack based classes yet.
Apr 03 2006