fosterbrereton

/*
MIT License

Copyright 2019 Foster T. Brereton

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute,
sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

nadavrot

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

miguelmota

package statuscode

import (
	"fmt"
	"strconv"
	"strings"
)

// Code are the status codes that define the stage of the transaction
type Code uint

shafik

What is the Strict Aliasing Rule and Why do we care?

(OR Type Punning, Undefined Behavior and Alignment, Oh My!)

What is strict aliasing? First we will describe what is aliasing and then we can learn what being strict about it means.

In C and C++ aliasing has to do with what expression types we are allowed to access stored values through. In both C and C++ the standard specifies which expression types are allowed to alias which types. The compiler and optimizer are allowed to assume we follow the aliasing rules strictly, hence the term strict aliasing rule. If we attempt to access a value using a type not allowed it is classified as undefined behavior(UB). Once we have undefined behavior all bets are off, the results of our program are no longer reliable.

Unfortunately with strict aliasing violations, we will often obtain the results we expect, leaving the possibility the a future version of a compiler with a new optimization will break code we th

AaronFlower

// https://github.com/michael-ciniawsky/postcss-load-config
//
const webpackConfig = require('./build/webpack.base.conf.js')
// 使用 postcss-import-webpack-resolver 就可以识别别名了。
const createResolver = require('postcss-import-webpack-resolver')

module.exports = {
  "plugins": {
    // to edit target browsers: use "browserslist" field in package.json
    // https://www.npmjs.com/package/postcss-import-webpack-resolver

estorgio

Update 28 July 2019: An updated version of this guide for Ubuntu Server 18.04 LTS is now available. Feel free to check it out.

Update 23 May 2020: This guide is ALREADY OUTDATED and might no longer work with new versions of Ubuntu and VirtualBox. Please consider switching to the updated guide instead. I will no longer respond to the replies to this gist. Thank you.

Mounting VirtualBox shared folders on Ubuntu Server 16.04 LTS

This guide will walk you through steps on how to setup a VirtualBox shared folder inside your Ubuntu Server guest. Tested on Ubuntu Server 16.04.3 LTS (Xenial Xerus)

liftoff

#!/usr/bin/env python

"""
An example of how to remove comments and trailing commas from JSON before
parsing.  You only need the two functions below, `remove_comments()` and
`remove_trailing_commas()` to accomplish this.  This script serves as an
example of how to use them but feel free to just copy & paste them into your
own code/projects.  Usage::

    json_cleaner.py some_file.json

lukechilds

get_latest_release() {
  curl --silent "https://api.github.com/repos/$1/releases/latest" | # Get latest release from GitHub api
    grep '"tag_name":' |                                            # Get tag line
    sed -E 's/.*"([^"]+)".*/\1/'                                    # Pluck JSON value
}

# Usage
# $ get_latest_release "creationix/nvm"
# v0.31.4

omidraha

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?

jacksongabbard

#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);
  }