Multidimensional array of struct - Segmentation fault

Question

I have a pointer to array of structure and when I try to initialize it, I get a segmentation fault.

MyStruct **** node = NULL;
node[0][0][0] = new MyStruct();

I tried to use 2D array and it Works fine.

What is wrong?

Thanks for your replies.

Isn't vector slower? Ok, now I rewrited it to vector <vector <vector <MyStruct* > > > node; and still segfault — user3287183
– user3287183, Commented Mar 29, 2014 at 16:18

HelloWorld123456789 · Accepted Answer · 2014-03-29 15:54:32Z

1

You need to allocate memory before using it. You can't just jump 3 levels without allocating and use it.

Allocate node first. Then you can access node[0].

Now if you allocate node[0], you can access node[0][0].

Go on like this.

answered Mar 29, 2014 at 15:54

HelloWorld123456789

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3 Comments

lethal-guitar Over a year ago

But in general, prefer using std::vector

HelloWorld123456789 Over a year ago

@lethal-guitar Yeah sure. Just answering to the question.

lethal-guitar Over a year ago

Yeah, that was meant mainly for the OP :)

Rontogiannis Aristofanis · Accepted Answer · 2014-03-29 16:26:55Z

0

Try to dynamically allocate the array first, using the new operator:

MyStruct ****node = new MyStruct***[MAX_SIZE];
for(int i=0; i<MAX_SIZE; ++i) node[i] = new MyStruct**[MAX_SIZE];
for(int i=0; i<MAX_SIZE; ++i) 
  for(int j=0; j<MAX_SIZE; ++j) node[i][j] = new MyStruct*[MAX_SIZE];
node[0][0][0] = new MyStruct();

answered Mar 29, 2014 at 16:26

Rontogiannis Aristofanis

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