skywind3000

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

skywind3000

/*

This file had now been added to the git repo 

       https://github.com/darrenjs/openssl_examples

... which also includes a non blocking client example.

-------------------------------------------------------------------------------
ssl_server_nonblock.c -- Copyright 2017 Darren Smith -- MIT license

skywind3000

"----------------------------------------------------------------------
" OpenURL[!] [url]
" - open url in default browser (change this by g:browser_cmd)
" - when bang (!) is included, ignore g:browser_cmd
" - when url is omitted, use the current url under cursor
" - vim-plug format "Plug 'xxx'" can also be accepted.
"----------------------------------------------------------------------
command! -nargs=* -bang OpenURL call s:OpenURL(<q-args>, '<bang>')
function! s:OpenURL(url, bang)
    let url = a:url

skywind3000

scriptencoding utf-8 " basic
set nocompatible " basic
filetype off " basic
filetype plugin on " Enable filetype plugins
filetype indent on " Enable loading the indent file for specific file types
syntax enable " Enable syntax highlighting
set encoding=utf-8 " Encoding (needed in youcompleteme)
set fileencoding=utf-8 " The encoding written to file.
set noerrorbells " No annoying sound on errors
set number " Line numbers on

skywind3000

#include <stdio.h>
#include <time.h>
#include <stdint.h>
#include <stdlib.h>
#include <chrono>
#include <thread>

int64_t clock_realtime()
{
	return std::chrono::duration_cast<std::chrono::nanoseconds>(

skywind3000

" root markers used to locate project
if !exists('g:projectile#marker')
    let g:projectile#marker = '.svn,.git,.projectile'
endif

" returns nearest parent directory contains one of the markers
function! projectile#find_root(name)
    let name = fnamemodify((a:name != '')? a:name : bufname(), ':p')
    let finding = ''
    " iterate all markers

skywind3000

<?xml version="1.0" encoding="UTF-8" standalone="true"?>
<FileZilla3>
    <Servers>
        <Server>
            <Host>ftp.cocosx.com</Host>
            <Port>21</Port>
            <Protocol>0</Protocol>
            <Type>0</Type>
            <User>[email protected]</User>
            <Logontype>2</Logontype>

skywind3000

import sys

skywind3000

import sys

skywind3000

// open new terminal
// https://stackoverflow.com/questions/47993595/launch-vscode-task-in-external-terminal-via-tasks-2-0-0
{
    "label": "%name%",
    "type": "shell",
    "command": "Start-Process -FilePath \"%path to bat%\"",
    "presentation": {
        "reveal": "never"
    },
    "problemMatcher": [],