seadiem

import CoreGraphics
import CoreImage
 
public struct ImageBufferMaker {
   
    let diagonal: SIMD2<Int>
 
    public init(diagonal: SIMD2<Int>) {
        self.diagonal = diagonal
    }

seadiem

public protocol TwoDimensional {
    associatedtype Measure: SignedNumeric, Comparable
    var xmesure: Measure { get set }
    var ymesure: Measure { get set }
}
 
/// * (0,3)(1,3)(2,3)(3,3)
/// * (0,2)(1,2)(2,2)(3,2)  
/// * (0,1)(1,1)(2,1)(3,1)
/// * (0,0)(1,0)(2,0)(3,0) -> (0,0)(1,0)(2,0)(3,0), (0,1)(1,1)(2,1)(3,1) ...

seadiem

/// [1, 2, 3, 4, 5, 6] -> (1,2) (1,3) (1,3) (1,4) (1,5) (1, 6) (2,3) (2,4) (2,5) (2,6) ...
 
public func eachToEachIn<C: Collection>(c: C) -> [(left: C.Element, right: C.Element)]?  where C.Element: Hashable {
    guard c.count > 1 else { return nil }
    var rightindex = c.startIndex
    var leftindex = c.startIndex
    var controlSet = Set<CoupleUnorderer<C.Element>>()
    while rightindex < c.endIndex {
        while leftindex < c.endIndex {
            let left = c[leftindex]