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Boost.Asio简单使用(Timer,Thread,Io_service类) - C/C++ - 清泛网 - 专注C/C++及内核技术

...造出void(const boost::asio::error&)形式函数. 注意,这里没有指定boost::asio::placeholders::error占位符,因为这个print成员函数没有接受一个error对象作为参数. timer_.async_wait(boost::bind(&printer::print, this)); 在类折构函数中我们输出最后一...
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Guid.NewGuid() vs. new Guid()

... An empty UUID is very useful indeed. It makes a great special value. – Jon Hanna Aug 13 '12 at 16:21 105 ...
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Does every Core Data Relationship have to have an Inverse?

... alternative solution, as discussed in the comments, is to create your own UUID property on the target (in the example here, every Page would have an id that is a UUID), store that as a property (currentPage just stores a UUID as an Attribute in Book, rather than being a relationship), and then writ...
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Vsphere 6 集群上 安装 oracle rac 遇到共享磁盘故障 - 数据库(内核) - ...

...示 不能访问物理存储 第一次死机 对比互联网上搜索方法对比 发现SCSI总线不一样。 参考文档http://www.doc88.com/p-5416264066182.html 按照网上方法,修改SCSI 控制1总线为LSI Logic 并行。修改好后,开启虚拟机电源...
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eclipse cdt 运行程序时添加依赖库路径 - C/C++ - 清泛网 - 专注C/C++及内核技术

...库和可执行文件在同一目录下,如果不使用 LD_LIBRARY_PATH 指定库路径(即当前目录)话,仍然会报加载不到依赖库错误。那么Eclipse CDT也是类似,可 我们知道Linux即使依赖库和可执行文件在同一目录下,如果不使用 LD_LIBRARY_...
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从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...考用户。 近邻算法分为2种: NearestNUserNeighborhood:指定N个数,比如,选出前10最相似用户。 ThresholdUserNeighborhood:指定比例,比如,选择前10%最相似用户。 6. 推荐算法工具集 推荐算法是以Recommender作为基础父类...
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MFC SetWindowPos 用法 - C/C++ - 清泛网 - 专注C/C++及内核技术

...cx、cy分别是窗口x和y坐标、宽和高度。hWndInsertAfter用来指定窗口Z位置(或称Z顺序)。如果你经常接触3D方面软件,你就知道Z代表深度。这个参数接受5种值:HWND_BOTTOM、 HWND_NOTOPMOST、HWND_TOP、HWND_TOPMOST或者另一个窗口句...
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通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

...改系统 /etc/security/limits 配置文件。该文件不仅能限制指定用户资源使用,还能限制指定资源使用。该文件每一行都是对限定一个描述,格式如下: <domain> <type> <item> <value> domain 表示用户或者组名字,还可...
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configure: error: Unable to find gd.h anywhere under /usr/local/gd - ...

...里就可以解决。 解决方式: 1.在gd库安装路径下搜索没有发现gd.h文件,但是在/etc/include下有gd.h文件 2.在网上搜索发现重装gd库可解决 3.重新安装gd库,在安装时出现: configure.ac:64: error: possibly undefined macro: AM_ICONV If th...
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creating a random number using MYSQL

... RAND(), UUID(), NOW() are indeterministic functions. The calling of such functions should be avoid from being written into the bin log for replication. For example. INSERT INTO t SET ID=UUID(); will cause the value of the ID fields t...