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How does Duff's device work?
... whether the loop is finished and jumping back to the top of the loop. The CPU can run faster when it's executing straight-line code instead of jumping.
The second aspect is the switch statement. It allows the code to jump into the middle of the loop the first time through. The surprising part to m...
ListCtrl 重绘（Custom Draw） - C/C++ - 清泛网 - 专注C/C++及内核技术
... DLL的版本必须至少是4.71。但随着IE4 的发布，这已经不是问题了。(IE会夹带着这个DLL一起发布)
Custom Draw 基础
我将会尽我所能把Custom Draw的处理描述清楚，而不是简单的引用MSDN的文档。这些例子都需要你的程序有一个ListCtrl在...
“Insufficient Storage Available” even there is lot of free space in device memory
...torage (like a harddrive in a computer). RAM is the "scratchpad" that the CPU uses while it's working and where your applications are loaded while they are running. With all the solid-state storage, the term ROM has really been "muddied". It really comes down to two different types of "memory" 1)...
Why can't enum's constructor access static fields?
...e problem solved via a nested class. Pros: it's shorter and also better by CPU consumption. Cons: one more class in JVM memory.
enum Day {
private static final class Helper {
static Map<String,Day> ABBR_TO_ENUM = new HashMap<>();
}
Day(String abbr) {
this.a...
parseInt vs unary plus, when to use which?
...arseInt beats unary plus on iOS :) This is helpful for web apps with heavy CPU consumption only. As a rule-of-thumb I'd suggest JS opt-guys to consider any JS operator over another one from the mobile performance point of view nowadays.
So, go mobile-first ;)
...
How do I declare a 2d array in C++ using new?
...
array[ index( x, y )]
Sad, I know. But you'll get used to it. And your CPU will thank you.
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How does this milw0rm heap spraying exploit work?
...e chunk, the probability of jumping there is high). When we jump there the CPU will keep executing or cl, [edx] instructions until in reaches the beginning of shellcode that's put in memory.
I've disassembled the shellcode:
00000000 C9 leave
00000001 2B1F sub ebx,[edi...
Add native files from NuGet package to project output directory
...ctory. So to add an x86 and x64 version of a native library used by an Any CPU managed assembly you would end up with a directory structure similar to the following:
build
x86
NativeLib.dll
NativeLibDependency.dll
x64
NativeLib.dll
NativeLibDependency.dll
MyNugetPackageID.targets
lib
ne...
multiprocessing: sharing a large read-only object between processes?
... the time that
Process.start() was called.
Example
On Windows (single CPU):
#!/usr/bin/env python
import os, sys, time
from multiprocessing import Pool
x = 23000 # replace `23` due to small integers share representation
z = [] # integers are immutable, let's try mutable object
def printx(...
Why is arr = [] faster than arr = new Array?
..., the VM knows we want an array; with new Array, the VM needs to use extra CPU cycles to figure out what new Array actually does.
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