Const/immutable
in aias

Const vs Immutable

Const:
Cannot be changed by the const reference to the data, but can be changed by another reference.

 int i = 8;
 const(int*) ip = &i;
 i = 7;   //OK, but *ip == 7
 *ip = 9; //error

Immutable:
Cannot be changed and no other references can change it.

 immutable int i = 8;     //can never be changed
 immutable(int*) ip = &i; //pointer and contents can't be changed

By default dimensions are mutable:

 auto dim = dimension!"Test"(...); //mutable

Once dimensions are added to a cube they become immutable:

 auto cube = denseCube!double(dim);
 auto cubeDim = cube.getDimension!"Test"; //immutable

Dimensions can be made immutable outside of a cube:

 auto iDim = dim.assumeDimUnique;

A set of dimensions can be made immutable:

 auto iDims = enforceUnique(dim1, dim2).expand;

Cubes are mutable by default:

 auto cube = denseCube!double(...); //mutable

They can be made constant easily:

 const cCube = denseCube!double(...);

But this isn't the same as immutable!

Like dims, cubes can be made immutable:

 auto iCube = cube.assumeCubeUnique;

Cube.assumeCubeUnique invalidates the passed cube:

 auto range = cube[];  //segfault!
 auto range = iCube[]; //The world is good!