https://wiki.dlang.org/Dense_multidimensional_arrays#Static_arrays describes a
way to create static arrays:
int[3][3] matrix = [
[ 1, 2, 3 ],
[ 4, 5, 6 ],
[ 7, 8, 9 ]
];
However my complains that I can't implicitly create static arrays
from dynamic arrays.
private T[R1][C2] loopMul(ulong R1, ulong C1, ulong R2, ulong C2,
T)(
auto ref T[R1][C1] matrixA, auto ref T[R1][C2] matrixB)
if (C1 == R2) {
T[R1][C2] result;
for (ulong r = 0; r < R1; ++r) {
for (ulong c = 0; c < C2; ++c) {
T toAdd = 0;
for (ulong n = 0; n < C1; ++n) {
toAdd += matrixA[r][n] + matrixB[c][n];
}
result[r][c] = toAdd;
}
}
}
void main() {
import std;
scope (success)
std.writeln("loopMul -- ok");
// assert([[0, -1, 2], [4, 11, 2]].loopMul!(2, 3, 3, 2,
int)([[3, -1], [1, 2], [6, 1]]) == [
// [11, 0], [35, 20]
// ]);
const int[2][3] matA = [[0, -1, 2], [4, 11, 2]];
const int[3][2] matB = [[3, -1], [1, 2], [6, 1]];
const int[2][2] matC = [[11, 0], [35, 20]];
assert(matA.loopMul(matB) == matC);
}
/// I would share the D online editor link but `shorten` button
doesn't do anything
onlineapp.d(24): Error: cannot implicitly convert expression [[0,
-1, 2], [4, 11, 2]] of type int[][] to const(int[2])[]
onlineapp.d(25): Error: cannot implicitly convert expression [[3,
-1], [1, 2], [6, 1]] of type int[][] to const(int[3])[]
onlineapp.d(27): Error: template onlineapp.loopMul cannot deduce
function from argument types !()(const(int[2][3]),
const(int[3][2])), candidates are:
onlineapp.d(1): loopMul(ulong R1, ulong C1, ulong R2,
ulong C2, T)(auto ref T[R1][C1] matrixA, auto ref T[R1][C2]
matrixB)
What's causing this?
