On 01/25/2017 05:47 PM, Profile Anaysis wrote:
> a 4x4 matrix and have a history of it. Just
> n 4x4 matrices but each matrix is a fixed size but there can be an
> arbitrary(dynamic) number.
I don't think using aliases is recommended yet. It can simplify things a
lot:
import std.stdio;
alias Row = int[4];
alias Matrix = Row[4];
alias History = Matrix[];
Row makeRow(int value) {
Row row;
row = value; // Special array syntax; all elements are now 'value'
return row;
}
Matrix makeMatrix() {
Matrix matrix;
foreach (int i, ref row; matrix) {
row = makeRow(i + 1);
}
return matrix;
}
void main() {
History history;
foreach (i; 0..3) {
history ~= makeMatrix();
}
writeln(history);
}
As others have said, D's array definition is natural because unlike C's
inside-out (or is that outside-in?) syntax, it follows from the alias
syntax. Replacing History inside main with Matrix[], etc.:
History history; // is the same as:
Matrix[] history; // is the same as:
Row[4][] history; // is the same as:
int[4][4][] history;
Ali
