AaronFlower

auth with microservices

Authorization and Authentication are hard. when you only have to implement them once (as you do within a monolith) instead of over and over again, it makes the developer happy :-), and maybe leads to less implementation failures.

When you have a bunch of microservices, this is something that has to be considered.

Implement it once or in every microservice, or something in between?

AaronFlower

High-Performance Matrix Multiplication

This is a short post that explains how to write a high-performance matrix multiplication program on modern processors. In this tutorial I will use a single core of the Skylake-client CPU with AVX2, but the principles in this post also apply to other processors with different instruction sets (such as AVX512).

Intro

Matrix multiplication is a mathematical operation that defines the product of

AaronFlower

#include <iostream>
#include <vector>
using namespace std;

void print(const vector<int>& vec) {
  vector<int>::const_iterator it = vec.begin();
  while(it < (vec.end() - 1)) {
    cout << *it << ',';
    advance(it, 1);
  }

AaronFlower

Default

Powerlevel9k

AaronFlower

<?php
/**
 * What is the difference between new self and new static?
 * self refers to the same class in which the new keyword is actually written.
 * 
 * static, in PHP 5.3's late static bindings, 
 * refers to whatever class in the hierarchy you called the method on.
 * 
 * In the following example, B inherits both methods from A. 
 * The self invocation is bound to A because it's defined in A's implementation 

AaronFlower

<?php
class Singleton 
{ 
    protected static $instance = null; 
    protected function __construct() 
    { 
        # Thou shalt not construct that which is unconstructable! 
    } 
    protected function __clone() 
    { 

AaronFlower

# VERSION CMake 最低版本需求
cmake_minimum_required (VERSION 3.10)

# 项目信息
project (Demo01)

# 指定生成目标

add_executable(power main.c)

AaronFlower

/**
 * CustomEvent polyfill
 * https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/CustomEvent#Polyfill
 */
(function () {
    try {
        // a : While a window.CustomEvent object exists, it cannot be called as a constructor.
        // b : There is no window.CustomEvent object
        new window.CustomEvent('T');
    } catch (e) {

AaronFlower

function observable (obj, onchange) {
  return new Proxy(obj, {
    set (target, key, value) {
      Reflect.set(target, key, value)
      onchange(key, value)
    },
    delete (target, key, value) {
      Reflect.delete(key)
      onchange(key, undefined)

AaronFlower

let link = document.createElement('link')
link.href = '/css/filename.css'
link.type = 'text/css'
link.rel = 'stylesheet'
link.media = 'screen,print'
document.getElementsByTagName( "head" )[0].appendChild( link )