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How does one generate a random number in Apple's Swift language?
... Swift, but the base functions are limited to 32-bit integer types (Int is 64-bit on iPhone 5S and modern Macs). Here's a generic function for a random number of a type expressible by an integer literal:
public func arc4random<T: ExpressibleByIntegerLiteral>(_ type: T.Type) -> T {
var ...
Failed to load the JNI shared Library (JDK)
...
You need a 64-bit trio:
64-bit OS
64-bit Java
64-bit Eclipse
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How can I convert an image into a Base64 string?
What is the code to transform an image (maximum of 200 KB) into a Base64 String?
14 Answers
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Can I get Memcached running on a Windows (x64) 64bit environment?
...yone know IF , WHEN or HOW I can get Memcached running on a Windows 64bit environment?
13 Answers
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Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
... a very weird effect: Changing the loop variable from unsigned to uint64_t made the performance drop by 50% on my PC.
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笑话几则 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...师父跑不了,有银行跟交警看着呢!”
科比惊呆了
一位中国学生问科比:“请问您成功的秘诀是什么?”科比说:“你知道早晨四点的城市是什么样吗?”学生:“知道,一般那时候我还没睡,怎么了?”科比:“没,没什么。...
蜘蛛的故事 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...佛的时候,正好甘鹿也陪同母亲而来。上完香拜过佛,二位长者在一边说上了话。蛛儿和甘鹿便来到走廊上聊天,蛛儿很开心,终于可以和喜欢的人在一起了,但是甘鹿并没有表现出对她的喜爱。蛛儿对甘鹿说:“你难道不曾记...
C++中判断文件、目录是否存在的几种方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...t.st_mode & _S_IFDIR))
{
isExist = true;
}
_S_IFDIR 是一个标志位,如果是目录的话,该位就会被系统设置。
在linux底下也有相对应的函数stat();
使用方法基本相同:
struct stat fileStat;
if ((stat(dir.c_str(), &fileStat) == 0) && S_ISDIR(fileStat.st...
AfxGetApp->GetMainWnd() 与 AfxGetMainWnd() - C/C++ - 清泛网 - 专注C/C++及内核技术
...的,通过下面的跟踪代码你不难看出. 记得当初有一位前辈曾提到过这个问题,只是不知它是否理解这其中的原因
以下是跟踪代码:
_AFXWIN_INLINE CWnd* AFXAPI AfxGetMainWnd()
{
CWinThread* pThread = AfxGetThread();
return pThread != NULL ...
C语言面试那些事儿──一道指针与数组问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
...cc 4.4.5的运行结果:
size of a: 20 (bytes) (Why? 因为机器是32位的, size of int 为 4 bytes,a有5个int)
size of ptr: 4 (bytes) (ptr是指针,永远不要忘记,32位字长的机器,指针长度是4)
ptr的地址:bfb5c52c (取决于具体情况,这里只是为了...
