[D1,static array] fill static multidimensional array.

bearophile bearophileHUGS at lycos.com
Thu Oct 21 19:41:17 PDT 2010


> What is the fastest way to fill a static multidimensional array?

If you want a safe solution, then you probably need nested loops, and a array[] = x; in the inner loop (such loops may be generated with a string mixin too).

Otherwise if speed is more important, fixed sized multidimensional arrays are stored in a contiguous way in D, so you may use a memset or something like:

import std.stdio: writeln;
void main() {
    int[5][4] mat;
    (cast(int[mat[0].length * mat.length])mat)[] = 10;

Or even:
(cast(int[mat.sizeof / int.sizeof])mat)[] = 10;

(If necessary you may use a recursive template trick to find the type of the basic item of the array).


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