mbinna

Effective Modern CMake

Getting Started

For a brief user-level introduction to CMake, watch C++ Weekly, Episode 78, Intro to CMake by Jason Turner. LLVM’s CMake Primer provides a good high-level introduction to the CMake syntax. Go read it now.

After that, watch Mathieu Ropert’s CppCon 2017 talk Using Modern CMake Patterns to Enforce a Good Modular Design (slides). It provides a thorough explanation of what modern CMake is and why it is so much better than “old school” CMake. The modular design ideas in this talk are based on the book [Large-Scale C++ Software Design](https://www.amazon.de/Large-Scale-Soft

gnaggnoyil

# python3 required
# tested on Windows 7 & Windows 10

import winreg

try:
	key = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, r"SOFTWARE\Microsoft\Windows NT\CurrentVersion")
	value = winreg.QueryValueEx(key, "DigitalProductId")
except OSError:
	print(r"""Cannot find value "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\DigitalProductId".""")

SandNerd

Event Bus

Using an EventBus in Android Pt 1: Why?

(EventBus) - Android optimized event bus that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality.

An EventBus is a great tool for decoupling components in your application. Over the next few posts I will describe the ways that I have been using it to make my code cleaner, easier to read, and easier to test. But first, this week I want to discuss why I use an EventBus in the first place. In particular, I will compare its use to some alternative techniques.

Fortyseven

{ Turbo Sort }
{ Copyright (c) 1985,90 by Borland International, Inc. }

program qsort;
{$R-,S-}
uses Crt;

{ This program demonstrates the quicksort algorithm, which      }
{ provides an extremely efficient method of sorting arrays in   }
{ memory. The program generates a list of 1000 random numbers   }

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD