ckwastra

Initialization in C++: A Corner Case

Recently, I've been trying to find out the difference between copy-initialization (e.g. in return statements) and direct-initialization (e.g. in static_cast expressions). Besides the explicit keyword, the code posted by Johannes really caught my attention because recent versions of GCC and Clang exhibit different behaviors for the mentioned code. Upon further investigation, it may be surprising that these behaviors are somewhat intentional. In the following, I will try to explain this corner case of initialization in C++. This post may be a bit arcane. Anyway, have fun reading!

Introduction

Given the following code:

// -std=c++23

htfy96

C++ Build profiles for 2024 projects

Standard development profile

This profile achieves 50% - 80% release profile performance, while also provides a reasonable amount of safety checks and debugging support. This should also be the profile for your CI build.

Compilation flags

-Og -Wall -Wextra -D_FORTIFY_SOURCE=2 -fstack-protector-strong -g -D_GLIBCXX_ASSERTIONS

cpursley

PostgreSQL is Enough

• Simplify: move code into database functions
• Just Use Postgres for Everything
• PostgreSQL is the worlds’ best database
• Postgres is eating the database world
• Hacker News discussion

Background and Cron Jobs

juansquintero

#!/usr/bin/env bash

# WARNING!!
# This will obliterate all the data in your partition!! (not actually true, but act as if it was)
# Do NOT execute this script if you don't fully understand it!


# create directories
mkdir -p /mnt/gentoo

expelledboy

#!/bin/bash

# !!WARNING!!
# This will DELETE all efforts you have put into configuring nix
# Have a look through everything that gets deleted / copied over

nix-env -e '.*'

rm -rf $HOME/.nix-*
rm -rf $HOME/.config/nixpkgs

charlesroper

How to setup a practically free CDN using Backblaze B2 and Cloudflare

⚠️ Note 2023-01-21
Some things have changed since I originally wrote this in 2016. I have updated a few minor details, and the advice is still broadly the same, but there are some new Cloudflare features you can (and should) take advantage of. In particular, pay attention to Trevor Stevens' comment here from 22 January 2022, and Matt Stenson's useful caching advice. In addition, Backblaze, with whom Cloudflare are a Bandwidth Alliance partner, have published their own guide detailing how to use Cloudflare's Web Workers to cache content from B2 private buckets. That is worth reading,

erincandescent

Foreward

This document was originally written several years ago. At the time I was working as an execution core verification engineer at Arm. The following points are coloured heavily by working in and around the execution cores of various processors. Apply a pinch of salt; points contain varying degrees of opinion.

It is still my opinion that RISC-V could be much better designed; though I will also say that if I was building a 32 or 64-bit CPU today I'd likely implement the architecture to benefit from the existing tooling.

Mostly based upon the RISC-V ISA spec v2.0. Some updates have been made for v2.2

Original Foreword: Some Opinion

The RISC-V ISA has pursued minimalism to a fault. There is a large emphasis on minimizing instruction count, normalizing encoding, etc. This pursuit of minimalism has resulted in false orthogonalities (such as reusing the same instruction for branches, calls and returns) and a requirement for superfluous instructions which impacts code density both in terms of size and

merijn

The Cabal/Stack Disambiguation Guide

One of the most frequently asked Haskell beginner questions in recent years is:

"Stack or cabal?"

I will helpfully not answer this question. Instead I will hope to eliminate the confusion that many of the askers seem to have about the various different

jarbro

Generate Symantec VIP Access Token as OTP

Recently I came across a web service that required two-factor authentication using the Symantec VIP Access App. I already manage all of my OTP tokens in a different app (If you are on iOS I highly recommend using OTP Auth by Roland Moers.) and did not want to have to use yet another app to generate the TOTP.

There is a way to generate a Symantec VIP Access compatible token very easily if you have access to an environment which can run Python PIP. I happen to have Ubuntu Windows Subsystem Linux running on my machine. (If you are running Windows 10 and don't have this you should really check it out.) Let's get started...

hello

Instructions

Here we install python3-pip and qrencode so we can generate our secret, I

etorreborre

/** from http://www.reddit.com/r/programming/comments/mlbna/scala_feels_like_ejb_2/c31z0co */
interface Pong<T> {}
class Ping<T> implements Pong<Pong<? super Ping<Ping<T>>>> {
    static void Ping() {
        Pong<? super Ping<Long>> Ping = new Ping<Long>();
    }
}


> javac Ping.java