Question

I am currently reading some C++ source code, and I came across this:

 double **out;
 // ... lots of code here 

 // allocate memory for out
 out = new double*[num];

Not entirely sure what it does, or what it means. Is it a pointer… to another pointer?

There is also the following:

 double ***weight;

 // allocate memory for weight
 weight = new double**[numl];

I am quite confused :P, any help is appreciated.

Answer 1

new double*[num] is an array of double pointers i.e. each element of the array is a double*. You can allocate memory for each element using out[i] = new double; Similarly weight is an array of double**. You can allocate the memory for each weight element using new double*[num] (if it is supposed to be an array of double*)