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dynamic array of ptrs to structs

General and Gameplay Programming Programming

Started by Convict@Large March 19, 2002 04:55 AM

5 comments, last by Convict@Large 22 years, 1 month ago

Convict@Large

122

Author

March 19, 2002 04:55 AM

I need to store data on connected clients in a array of structs (easy enough), I only allow up to a Max number of clients to connect but I am a bit confused as to how to make it dyamic (using new operator), as I want to be able to change max clients at run-time and be able to change length of array used to store info. I am getting a bit confused does this code look right?

  
//  define test struct

struct STest
{
  int TInt;
}
//define ptr type for STest

typedef STest* ptr_STest;
// ptr to be used for array

STest *ArrayPtrTest;
/*this is where I get confused, will this give me an array of ptr to struct STest? */
ArrayPtrTest = new ptr_STest [100];

or should ArrayPtrTest be Declared as:

  
ptr_STest *ArrayPtrTest;

Cheers, Convict@Large

DanielB - Slayer of Bugs

Peter Svensson

122

March 19, 2002 05:03 AM

100 pointers ....

What you wanna do is...

ArrayPtrTest = new STest [100];

...swisch and you have a pointer pointing to 100 STests.

And i think you should declare your pointer like this...

ptr_STest ArrayPtrTest;

...since you made a new type for it. But both ways work fine.

/Peter

Convict@Large

122

Author

March 19, 2002 05:06 AM

Thanks for the quick response Peter.

Cheers,

Convict@Large

DanielB - Slayer of Bugs

SabreMan

504

March 19, 2002 05:13 AM

std::vector vect_test;

Forget about arrays in C++ - they are plain daft!

Convict@Large

122

Author

March 19, 2002 05:22 AM

A vector is a dynamic array isn''t it? I am wanting an array that I can declare the maximum size of, so a vector would be no use unless its size could be capped. Would a list be a better solution? Or a map as that would enforce unique connection ids which a list would not...

While we are on topic of STL (something I have yet to learn properally) can someone point me towards a good book or web tutoral for learning STL? I allready know C/C++ but have no experience using STL...

Cheers,

Convict@Large

DanielB - Slayer of Bugs

siaspete

208

March 19, 2002 05:41 AM

Why not just do a check, before adding new items? Something like...

  if (my_list.size () < 100){    my_list.push_back (item);}

On a side note, I quite dislike the new code boxes.

Saurus Games, home of the Independent Game Engine

SabreMan

504

March 19, 2002 06:49 AM

Well yes, a vector can grow to meet the number of elements you insert. If you want to restrict the max number, then add some code to do the check, as siaspete suggests. However, you have to check the upper limit with an array too. The difference with an array is that you get undefined behaviour if you go over the limit. To my mind, that''s much worse!

As for an STL reference, I''ve yet to find anything that even gets close to Josuttis'' The C++ Standard Library.

quote:Original post by siaspete
On a side note, I quite dislike the new code boxes.

Me too.

dynamic array of ptrs to structs

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