Best method for passing multi dimentional arrays

[moomin]

I've seen a few different ways some with more advantages than others, but there isn't really a good way of doing it with references (Unless you specify one of the column max length values)


The only acceptable method so far is using a pointer-to-pointer method


i.e.

GridNodes myNodes = new GFridNodes[maxSize][maxSize];

DoSomething(myNodes,maxSize);



void DoSomething function (GridNodes **nodeArray, int maxSize)
{
int i,j;

for (i=0;i<maxSize;i++)
{
for(j=0;j<maxSize;j++)
{

GridNodes[i][j] = callSomFunction();
}
}
}





anyone any better ideas?

[UnknownStranger]

Well, I like the ** approach, and I don't see any problems using it...

[moomin]

I was just curious if there was a neat way of using references, but doesn't look like it :{

[davepermen]

i never use multidimensional arrays.. i always access them manually as such..

good thing: if you don't care about width/height/depth of them, you can simply iterate linearly through them, performing your task.. best to optimize later.. :D

[baldurk]

what if the dimensions aren't the same?

[davepermen]

hm? what do you mean?

[fringe]

Hey Guys,

If you are using c++ you could write an object thatyou could pass round by reference. This could have as many dimensions as you wish and there the object can check for overflows andwrong dimensionality etc.

fringe

[baldurk]

davepermen: his code assumes it's a "square" array, what if the dimensions were 4 and 6?

fringe: you could do that in C, but sometimes it is a bit of a waste.

[davepermen]

ahh okay, you where not talking about me:D

hm, fringe.. the per access bound checking is a terrible idea imho.. it is just sooooo slow:D

[DrunkenCoder]

for jagged arrays use a vector of vectors and for uniform arrays write a wrapper

[davepermen]

Wrapper in Code Snippets (http://www.devmaster.net/forums/index.php?act=ST&f=35&t=423)

[donBerto]

...or you can just use everybody's favorite mechanism here on devmaster: a TEMPLATED container!

edit: i see davepermen already beat me to it.

:yes:

[davepermen]

hehe, i try my best:D