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XPath OR operator for different nodes
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Logical operators (OR, XOR, AND) are the same in every programming language but natural language interprets them slightly different. It's best to remove ambiguity when discussing issues related to them. Furthermore, with XPath it's best not to thin...
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
.../proc/sys/kernel/pid_max,/proc/sys/net/ipv4/ip_local_port_range 等等,从文件的名字大致可以猜出所限制的资源种类。由于该目录下涉及的文件众多,在此不一一介绍。有兴趣的读者可打开其中的相关文件查阅说明。
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ulimit 管理系...
Stack smashing detected
... mov %rax,-0x8(%rbp)
40058e: 31 c0 xor %eax,%eax
char arr[] = {'a', 'b', 'c', 'd'};
400590: c6 45 f4 61 movb $0x61,-0xc(%rbp)
400594: c6 45 f5 62 movb $0x62,-0xb(%rbp)
400598: c6 45 f6 63 m...
REDHAT 6.4 X64下ORACLE 11GR2静默安装 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...vim /etc/sysctl.conf
[root@redhat mnt]# sysctl –p 使之生效
从互联网上找到这个包,然后上传到/MNT/目录
注意:为避免与 pdksh 冲突,ksh-2*包可以不安装或在安装完 pdksh 以后再安装。
将pdksh 程序包下载到本地。 Pdksh安装包需要在...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...支持基于mysql认证功能,所以这里要源码编译安装postfix
从配置简单方面考虑,我们根据postfix的默认配置条件进行新建用户等,以免漏掉某些修改,导致的一些麻烦
1、建立postfix用户,并且指定UID,GID为2525,组postdrop
groupadd -...
What does |= (single pipe equal) and &=(single ampersand equal) mean
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I think you want to use a XOR instead of an AND for this.
– GameZelda
Aug 4 '11 at 13:59
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How to reverse a singly linked list using only two pointers?
...out using a third. Simply cast the pointers to a int/long and perform the XOR operation a couple of times. This is one of those C tricks that makes for a fun question, but doesn't have any practical value.
Can you reduce the O(n) complexity? No, not really. Just use a doubly linked list if yo...
线程访问窗口资源的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
...m_hWnd)) != NULL ||
(p = pMap->LookupTemporary(m_hWnd)) != NULL)失败;从线程的句柄映射表没有句柄pWnd->m_hWnd所对应 的对象。
3.ASSERT((CWnd*)p == this);句柄pWnd->m_hWnd所对应 的对象并不是自身。
进行这几种断言的目的:确保C++窗口对象(Cwnd)...
How can I map True/False to 1/0 in a Pandas DataFrame?
...r: numpy boolean subtract, the -` operator, is deprecated, use the bitwise_xor, the ^ operator, or the logical_xor function instead.` Using @User's answer fixes this.
– Amadou Kone
Mar 13 '19 at 16:01
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Mozilla PDF.js:PDF在线预览 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...析和渲染PDF文件的平台。https://github.com/ChineseDron/pdf.js# 是从Mozilla原版中fork出来的一个版本,原版的链接在这里https://github.com/mozilla/pdf.js 原版的版次新一些,我们用原版。
PDF.js怎么用
这个viewer我觉得就是PDF.js的最终UI。根据...