does C# have pointers??

Meshal · 04-14-2007, 12:22 AM

does c# have pointers !!

and if the answer is no ..

how can i implement the static/dynamic hashing?

**nvoigt** · 04-14-2007, 03:55 AM

The answer is yes and yes and no.

Basically, every reference type in .NET is a pointer.

You can have explicit pointers in unmanaged code including a ton of complications that come with the full unmanaged package.

And no, to the user, nothing in C# is handled like a pointer. There is no dereferencing or an -> operator.

I don't really know what you mean with dynamic/static hashing, but you can implement it in C#. Maybe you can explain what you want to achieve.

Meshal · 04-14-2007, 12:39 PM

thanks for answers my questions ..

and what i mean by static and dynamic hashing is this:
statick-hashing
http://www.cs.sfu.ca/CC/354/zaiane/m...00000000000000
http://www.dis.uniroma1.it/~catarci/...3LT/sld003.htm

dynamic hashing(extensible hashing)
http://www.dis.uniroma1.it/~catarci/...3LT/sld005.htm

how can i implement those hashing technique in C# , because i need a pointer to point to the buckets

buckets = blocks

**CornedBee** · 04-15-2007, 02:25 AM

You use references to point to the buckets, in simple, standard C#. There's nothing special about hashing in this regard.

Meshal · 04-15-2007, 06:34 AM

how i can reference to point to the bucket ??

can you show me an example ?!

**CornedBee** · 04-15-2007, 07:58 AM

Code:

Bucket[] buckets = new Bucket[numBuckets];

wiiire · 04-15-2007, 08:52 AM

Yeah gotta love C# for this particular ambiguity

**CornedBee** · 04-15-2007, 08:56 AM

Which one?

wiiire · 04-15-2007, 09:09 AM

Its illustrious memory handling

Meshal · 04-16-2007, 03:22 AM

so how can binary tree or binary search programmed in C# without using real pointers ?!!

**nvoigt** · 04-16-2007, 03:38 AM

C# has pointers. It's just that C# has nothing else that's probably a bit confusing. Every reference type in C# is what C++ would call a pointer. You just don't need to free the memory, because it's managed/garbage collected. And you don't need those pointer semantics/syntactics, because the compiler already knows if something is a pointer ( reference type ) or not ( value type ).

CObject* o = new CObject( "test" ); // perfectly valid C++

Object o = new Object( "test" ); // perfectly valid C#

Those two lines are exactly the same. An object is created dynamically.

siavoshkc · 04-17-2007, 02:18 AM

C# supports C++ type pointers. But it is called unsafe code. It is better to use .NET standard libs for those kind of operations OR you may go to MSDN for unsafe code.

04-14-2007, 12:22 AM	#1
Meshal C 1337 Join Date: Nov 2006 Posts: 70	does C# have pointers?? does c# have pointers !! and if the answer is no .. how can i implement the static/dynamic hashing?
Meshal is offline

04-14-2007, 03:55 AM	#2
nvoigt the hat of redundancy hat Join Date: Aug 2001 Location: Hannover, Germany Posts: 2,769	The answer is yes and yes and no. Basically, every reference type in .NET is a pointer. You can have explicit pointers in unmanaged code including a ton of complications that come with the full unmanaged package. And no, to the user, nothing in C# is handled like a pointer. There is no dereferencing or an -> operator. I don't really know what you mean with dynamic/static hashing, but you can implement it in C#. Maybe you can explain what you want to achieve. __________________ hth -nv She was so Blonde, she spent 20 minutes looking at the orange juice can because it said "Concentrate." When in doubt, read the FAQ. Then ask a smart question.
nvoigt is offline

04-14-2007, 12:39 PM	#3
Meshal C 1337 Join Date: Nov 2006 Posts: 70	thanks for answers my questions .. and what i mean by static and dynamic hashing is this: statick-hashing http://www.cs.sfu.ca/CC/354/zaiane/m...00000000000000 http://www.dis.uniroma1.it/~catarci/...3LT/sld003.htm dynamic hashing(extensible hashing) http://www.dis.uniroma1.it/~catarci/...3LT/sld005.htm how can i implement those hashing technique in C# , because i need a pointer to point to the buckets buckets = blocks
Meshal is offline

04-15-2007, 02:25 AM	#4
CornedBee Cat without Hat Join Date: Apr 2003 Posts: 8,492	You use references to point to the buckets, in simple, standard C#. There's nothing special about hashing in this regard. __________________ All the buzzt! CornedBee "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code." - Flon's Law
CornedBee is offline

04-15-2007, 06:34 AM	#5
Meshal C 1337 Join Date: Nov 2006 Posts: 70	how i can reference to point to the bucket ?? can you show me an example ?!
Meshal is offline

04-15-2007, 07:58 AM	#6
CornedBee Cat without Hat Join Date: Apr 2003 Posts: 8,492	Code: Bucket[] buckets = new Bucket[numBuckets]; __________________ All the buzzt! CornedBee "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code." - Flon's Law
CornedBee is offline

04-15-2007, 08:52 AM	#7
wiiire Registered User Join Date: Apr 2007 Posts: 45	Yeah gotta love C# for this particular ambiguity __________________ we are one
wiiire is offline

04-15-2007, 08:56 AM	#8
CornedBee Cat without Hat Join Date: Apr 2003 Posts: 8,492	Which one? __________________ All the buzzt! CornedBee "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code." - Flon's Law
CornedBee is offline

04-15-2007, 09:09 AM	#9
wiiire Registered User Join Date: Apr 2007 Posts: 45	Its illustrious memory handling __________________ we are one
wiiire is offline

04-16-2007, 03:22 AM	#10
Meshal C 1337 Join Date: Nov 2006 Posts: 70	so how can binary tree or binary search programmed in C# without using real pointers ?!!
Meshal is offline

04-16-2007, 03:38 AM	#11
nvoigt the hat of redundancy hat Join Date: Aug 2001 Location: Hannover, Germany Posts: 2,769	C# has pointers. It's just that C# has nothing else that's probably a bit confusing. Every reference type in C# is what C++ would call a pointer. You just don't need to free the memory, because it's managed/garbage collected. And you don't need those pointer semantics/syntactics, because the compiler already knows if something is a pointer ( reference type ) or not ( value type ). CObject* o = new CObject( "test" ); // perfectly valid C++ Object o = new Object( "test" ); // perfectly valid C# Those two lines are exactly the same. An object is created dynamically. __________________ hth -nv She was so Blonde, she spent 20 minutes looking at the orange juice can because it said "Concentrate." When in doubt, read the FAQ. Then ask a smart question.
nvoigt is offline

04-17-2007, 02:18 AM	#12
siavoshkc System Novice Join Date: Jan 2006 Location: Tehran Posts: 1,075	C# supports C++ type pointers. But it is called unsafe code. It is better to use .NET standard libs for those kind of operations OR you may go to MSDN for unsafe code. __________________ Microsoft Visual Studio 2008 Professional (On Microsoft Windows XP SP2) Learn the language before using it. (C++ Books and C Books) Read the FAQ before making a problem. Then make a Google and Forum search. My code painter new version Version 0.97 DOWNLOAD NOW! (Let the pop up, pop!) SiavoshKC
siavoshkc is offline

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Using pointers to pointers	steve1_rm	C Programming	18	05-29-2008 05:59 AM
function pointers	benhaldor	C Programming	4	08-19-2007 10:56 AM
Request for comments	Prelude	A Brief History of Cprogramming.com	15	01-02-2004 10:33 AM
Staticly Bound Member Function Pointers	Polymorphic OOP	C++ Programming	29	11-28-2002 01:18 PM