alex-cellcity

/*
 *  System Versioning Preprocessor Macros
 */ 

#define SYSTEM_VERSION_EQUAL_TO(v)                  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v)              ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v)                 ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v)     ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)

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

yamaya

# Xcode 4.3.3
Apple clang version 3.1 (tags/Apple/clang-318.0.61) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.0
Thread model: posix

# Xcode 4.3.2
Apple clang version 3.1 (tags/Apple/clang-318.0.58) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.0
Thread model: posix

ngs

[[NSLocale availableLocaleIdentifiers] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
  NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:obj];
  NSLog(@"<tr><td>%@</td><td>%@ / %@</td></tr>", locale.localeIdentifier, [[NSLocale systemLocale] displayNameForKey:NSLocaleIdentifier value:obj], [locale displayNameForKey:NSLocaleIdentifier value:obj]);
}];

pixnbit

CGPoint p1, p2, p3, q1, q2, q3;

// TODO: initialize points

double A[36];

A[ 0] = p1.x; A[ 1] = p1.y; A[ 2] = 0; A[ 3] = 0; A[ 4] = 1; A[ 5] = 0;
A[ 6] = 0; A[ 7] = 0; A[ 8] = p1.x; A[ 9] = p1.y; A[10] = 0; A[11] = 1;
A[12] = p2.x; A[13] = p2.y; A[14] = 0; A[15] = 0; A[16] = 1; A[17] = 0;
A[18] = 0; A[19] = 0; A[20] = p2.x; A[21] = p2.y; A[22] = 0; A[23] = 1;

clowwindy

SSL 设计目标:

1. 防内容篡改
2. 防冒充服务器身份
3. 加密通信内容

而翻墙的目标:

1. 不被检测出客户端在访问什么网站
2. 不被检测出服务器在提供翻墙服务

timdream

Github 發 Pull Request & 貢獻流程速查

前言

此文目標讀者需先自行學會

• 開 Github 帳號
• 會 fork 程式 repository
• 會在自己的電腦使用命令列 git
• 會 clone 自己的 repository

aegzorz

#import <UIKit/UIKit.h>

@interface UIView (Recursion)

/**
 Return YES from the block to recurse into the subview.
 Set stop to YES to return the subview.
 */
- (UIView*)findViewRecursively:(BOOL(^)(UIView* subview, BOOL* stop))recurse;

spawnrider

#!/bin/bash
##########################################################
# Fix Symlinks
#
# Usage : Copy this file into the Framework directory,
# Execute it passing the Framework Name in argument.
#
##########################################################

if [ -z $1 ] ; then

aras-p

// Just before switching jobs:
// Add one of these.
// Preferably into the same commit where you do a large merge.
//
// This started as a tweet with a joke of "C++ pro-tip: #define private public",
// and then it quickly escalated into more and more evil suggestions.
// I've tried to capture interesting suggestions here.
//
// Contributors: @r2d2rigo, @joeldevahl, @msinilo, @_Humus_,
// @YuriyODonnell, @rygorous, @cmuratori, @mike_acton, @grumpygiant,