2d array of pointers c++

Question

Why doesn't this code work at making a 2D array pointers in c++? The compiler complains about the second line not being a modifiable l-value.

      int* g[2][2];
  g[0] = new (int*)[2];

@SamAdams: You already have that after the first line. What's the intent of the second line? — Oliver Charlesworth
– Oliver Charlesworth, Commented Apr 19, 2012 at 0:22
just trying to learn c++ so i guess the second line is useless and the 2d array is already initialized after the first line. — Sam Adamsh
– Sam Adamsh, Commented Apr 19, 2012 at 0:25

Oliver Charlesworth · Accepted Answer · 2012-04-19 00:18:59Z

5

The type of g[0] is int* [2], i.e. it's an array. You cannot assign to an array.

It's not clear what you're trying to achieve, so I can't offer a solution. If you clarify your question, I may be able to do better.

answered Apr 19, 2012 at 0:18

Oliver Charlesworth

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AusCBloke · Accepted Answer · 2012-04-19 00:20:21Z

3

The first line is all you need to create an array of 2 arrays of pointers to int.

The reason you can't assign a new value to g[0] is because g[0] itself is an array, and you can't assign a new value to an array, only its elements.

answered Apr 19, 2012 at 0:20

AusCBloke

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