Useful modules for dlang.
import d.util.bits
BitArray has been written to store bits in a small array rather than an array of 8 byte elements. Storing a bool on an 8 byte element would take up more memory than is needed to store bits. It may be renamed to bitfield instead, eventually. It is self initialized, and to assign a variable with a bitarray or bitfield, you can use BitField!{number of bits} {variable name}. You can then set a bit to either true or false using {variable name}[{index of bit}]= {true|false value}, or retrieve the true or false value like with {variable name}[{index}].
import d.util.array
These are tensors aka multidimensional arrays in programming. They are data-structures that can handle 2D, and even 3D arrays. Array!{type}({X}, {Y}) gives you a 2 dimensional array. Same goes with 3 dimensional arrays (Array!{type}({X}, {Y}, {Z})).