BruceChen7

Here's a list of mildly interesting things about the C language that I learned mostly by consuming Clang's ASTs. Although surprises are getting sparser, I might continue to update this document over time.

There are many more mildly interesting features of C++, but the language is literally known for being weird, whereas C is usually considered smaller and simpler, so this is (almost) only about C.

1. Combined type and variable/field declaration, inside a struct scope [https://godbolt.org/g/Rh94Go]

struct foo {
   struct bar {
 int x;

iximiuz

#!/usr/bin/env bash

set -xeuo pipefail

create_bridge() {
    local nsname="$1"
    local ifname="$2"

    echo "Creating bridge ${nsname}/${ifname}"

BruceChen7

资料

• https://golang.org/ref/mem
• https://dave.cheney.net/2013/04/30/curious-channels

并发和并行

• 并发(Concurrency)：Composition of independently executing process (processes in the general sense, not linux processes.
• 并行(Parallism): Simultaneous execution of computations

rondy

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

---

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

leverich

# Systemtap script to trace latency of concurrent memcached requests
# as they percolate through the Linux kernel.
# - Jacob Leverich <leverich@cs.stanford.edu> 2013
#
# Note: You MUST call this script with "-x <TID>" where TID is the
# *task id* of a memcached worker thread. This is usually PID+1 of
# memcached. So do something like:
#
#    % memcached -t 1 -d
#    % pgrep memcached

rgs

Falsehoods programmers believe about prices

1. You can store a price in a floating point variable.
2. All currencies are subdivided in 1/100th units (like US dollar/cents, euro/eurocents etc.).
3. All currencies are subdivided in decimal units (like dinar/fils)
4. All currencies currently in circulation are subdivided in decimal units. (to exclude shillings, pennies) (counter-example: MGA)
5. All currencies are subdivided. (counter-examples: KRW, COP, JPY... Or subdivisions can be deprecated.)
6. Prices can't have more precision than the smaller sub-unit of the currency. (e.g. gas prices)
7. For any currency you can have a price of 1. (ZWL)
8. Every country has its own currency. (EUR is the best example, but also Franc CFA, etc.)