KrisYu

// A simple quickref for Eigen. Add anything that's missing.
// Main author: Keir Mierle

#include <Eigen/Dense>

Matrix<double, 3, 3> A;               // Fixed rows and cols. Same as Matrix3d.
Matrix<double, 3, Dynamic> B;         // Fixed rows, dynamic cols.
Matrix<double, Dynamic, Dynamic> C;   // Full dynamic. Same as MatrixXd.
Matrix<double, 3, 3, RowMajor> E;     // Row major; default is column-major.
Matrix3f P, Q, R;                     // 3x3 float matrix.

KrisYu

import UIKit

extension UIImage {

    subscript (x: Int, y: Int) -> UIColor? {

        if x < 0 || x > Int(size.width) || y < 0 || y > Int(size.height) {
            return nil
        }

KrisYu

import Foundation

protocol Observer {
    var id: String { get }
    func update(_ string: String)
}

extension Observer {
    func update(_ string: String) {
        print("\(type(of: self)) に届いた新しい値は \(string) です。")

KrisYu

import Foundation

protocol Observer {
    var id: String { get }
    func update(_ string: String)
}

extension Observer {
    func update(_ string: String) {
        print("\(type(of: self)) に届いた新しい値は \(string) です。")

KrisYu

//
//  RW.swift
//  Web
//
//  Created by Mike Chirico on 10/15/15.
//  Copyright © 2015 Mike Chirico. All rights reserved.
//

import UIKit