Hi Guys,
Just wondering if it is possible to somehow create and initialise a 2D array with varying sized data.
Something like this;
float item[][0] = { 1.0, 9.0, 3.5 };
float item[][1] = { 9.5, 1.2, 9.9, 7.7, 2.4, 1.8 };
And then access the data how ever I wise after that, being aware to check sizeof(item[x][y]) obviously.
Is this sort of thing possible?
Or is a std::vector better for this sort of thing?
Thanks in advance.
Take a step back... what are you trying to achieve?
Will the size of the individual rows change, or will it be allocated upfront? You could make it a 1d array with some clever indexing (hidden behind a class).
There are lots of ways of doing this... in terms of simplicity a vector of vectors (std::vector<std::vector<float>>) will achieve what you want with a minimum of fuss and be almost guaranteed to be leak free. But it might not be optimal for your scenario (if performance is a consideration).
Hi there and thanks for the reply.
Each array will be static. Essentially, I want to store frame animation and each frame is a 1D array. So, I want to be able to increment or manually choose what frame I want but have it in the form of frame[n]. 'n' being the frame number.
float data_array[] = { 1.0, 9.0, 3.5,
9.5, 1.2, 9.9, 7.7, 2.4, 1.8 };
float *item[] = { data_array, data_array + 3 };
Thanks Alvaro. I was driving home from work and I was thinking of a solution along very similar lines to what you have there.
I'll have a play around and see what I can come up with. :)
Personally I tend to avoid multi-dimensional arrays just because they add a lot of little things to think about like the order you're traversing them in. I mean, usually you can get the same result just by hiding the implementation behind some interface code.
But that's just me.
