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搭建高可用mongodb集群(四)—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...转发到对应的shard服务器上。在生产环境通常有多mongos作请求的入口,防止其中一个挂掉所有的mongodb请求都没有办法操作。 config server,顾名思义配置服务器,存储所有数据库元信息(路由、分片)的配置。mongos本身没有物...
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Loop through Map in Groovy?

... Quite simple with a closure: def map = [ 'iPhone':'iWebOS', 'Android':'2.3.3', 'Nokia':'Symbian', 'Windows':'WM8' ] map.each{ k, v -> println "${k}:${v}" } ...
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CGContextDrawImage draws image upside down when passed UIImage.CGImage

... I had issues once with ImageMagick where the iPhone camera resulted in incorrect orientation. It turns out it's do the the orientation flag in the image file, so portrait images were, say 960px x 640px with the flag set to "left" - as in the left side is the top (or so...
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Is it possible to Turn page programmatically in UIPageViewController?

... exist. how to use it there. can you please guide. – iPhone Programmatically Dec 14 '12 at 6:50 add a comment  |  ...
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Sending a message to nil in Objective-C

...nd it's the recommended programming idiom in Objective-C (see the Stanford iPhone programming lectures). share | improve this answer | follow | ...
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fstream默认不支持中文路径和输出整数带逗号的解决办法 - C/C++ - 清泛网 -...

...系统下,调用locale::global(std::locale("")),将全局区域设置中文,如下例: #include <iostream> #include <fstream> #include <string> #include <direct.h> using namespace std; void main() { locale::global(std::locale("")); //将全局区域设操作系统...
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C++/COM VARIANT实现二维数组 - C/C++ - 清泛网 - 专注C/C++及内核技术

...全数组可以实现多维数组,SAFEARRAY实现的步骤可以大致分三步。 (1)创建SAFEARRAY安全数组,包括设置数组元素的类型、数据的维数,大小等。 (2)对SAFEARRAY数组赋值,既可通过SafeArrayPutElement函数逐个元素进行负责,也可...
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error C2804:binary \'operator +\' has too many parameters - C/C++ - 清泛网 - 专注C/C++及内核技术

...ference } 解决方法:+操作符包括两个操作数,应该重载普通非成员函数。 注意重载操作符的形参数目(包括成员函数的隐式 this 指针)与操作符的操作数数目相同。对称的操作符,如算术操作符、相等操作符、关系操作符...
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XP风格按钮的实现 - C/C++ - 清泛网 - 专注C/C++及内核技术

...闭工程,将工程目录下的.clw文件删除,重新打开工程,对话框添加一个按钮。通过类向导此按钮控件添加一个变量,变量类型选择CXPButton; (在此步骤中如果不删除.clw文件,则在选择变量类型的时候下拉列表中不会出现CX...
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c/c++ volatile和mutable关键字 - C/C++ - 清泛网 - 专注C/C++及内核技术

c/c++ volatile和mutable关键字1 volatile关键字:一个定义volatile的变量是说这变量可能会被意想不到地改变,这样,编译器就不会去假设这个变量的值了。例如:假设编译 1、volatile关键字: 一个定义volatile的变量是说这变量可...