kconner

macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

Starting Points

How to use this gist

You've got two main options:

halfelf

https://web.archive.org/web/20110219163448/http://howtohft.wordpress.com/2011/02/15/how-to-build-a-fast-limit-order-book/

The response to my first few posts has been much larger than I’d imagined and I’d like to thank everyone for the encouragement.

If you’re interested in building a trading system I recommend first reading my previous post on general ideas to keep in mind.

My first really technical post will be on how to build a limit order book, probably the single most important component of a trading system. Because the data structure chosen to represent the limit order book will be the primary source of market information for trading models, it is important to make it both absolutely correct and extremely fast.

To give some idea of the data volumes, the Nasdaq TotalView ITCH feed, which is every event in every instrument traded on the Nasdaq, can have data rates of 20+ gigabytes/day with spikes of 3 megabytes/second or more. The individual messages average about 20 bytes each so this means handling

IvanIsCoding

// Ivan Carvalho
// Problem A - Educational Dynamic Programming Contest - AtCoder
// Link : https://atcoder.jp/contests/dp
#include <bits/stdc++.h>
using namespace std;

const int MAXN = 1e5 + 10;
const int INF = 2*1e9;

int dp[MAXN],N,K,h[MAXN];

mitchelkuijpers

var gulp = require('gulp');
var browserify = require('browserify');
var notify = require('gulp-notify');
var source = require('vinyl-source-stream');
var watchify = require('watchify');
var plumber = require('gulp-plumber');
var less = require('gulp-less');
var csso = require('gulp-csso');
var watch = require('gulp-watch');
var envify = require('envify');

ion1

The class

class Num a where
  (+) :: a -> a -> a
  negate :: a -> a

desugars to something like

jessedearing

#!/bin/bash
echo "Generating an SSL private key to sign your certificate..."
openssl genrsa -des3 -out myssl.key 1024

echo "Generating a Certificate Signing Request..."
openssl req -new -key myssl.key -out myssl.csr

echo "Removing passphrase from key (for nginx)..."
cp myssl.key myssl.key.org
openssl rsa -in myssl.key.org -out myssl.key