Collapsing n-dimensional array to linear (1 dimensional)

[abad via Digitalmars-d-learn]

Let's say I have an array like this:

int[][][] array;

And I want to generate a linear int[] based on its data. Is there 
a standard library method for achieving this, or must I iterate 
over the array manually?

What I'm thinking of is something like this:

int[] onedim = std.array.collapse(array);