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* @abstract
*/
export class Ordering {
/** @member {number} - leading dimension */
ld;
constructor(ld) {
this.ld = ld;
}
/**
* @abstract
* @param {number} row - row accessor
* @param {number} col - col accessor
* @returns {number} - address i
*/
toI(row, col) {}
/**
* @abstract
* @param {number} i - address i
* @returns {[number, number]} - [row, col] accessors
*/
fromI(i) {}
}
class RowMajor extends Ordering {
constructor(width) {
super(width);
}
toI(row, col) {
return this.ld * row + col;
}
fromI(i) {
const row = Math.floor(i / this.ld);
const col = i - row * this.ld;
return [row, col];
}
}
class ColMajor extends Ordering {
constructor(height) {
super(height);
}
toI(row, col) {
return this.ld * col + row;
}
fromI(i) {
const col = Math.floor(i / this.ld);
const row = i - col * this.ld;
return [row, col];
}
}
export { ColMajor, RowMajor };
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