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How to work around the lack of transactions in MongoDB?
I know there are similar questions here but they are either telling me to switch back to regular RDBMS systems if I need transactions or use atomic operations or two-phase commit . The second solution seems the best choice. The third I don't wish to follow because it seems that many things coul...
Colon (:) in Python list index [duplicate]
...[len(a):] - This gets you the length of a to the end. It selects a range. If you reverse a[:len(a)] it will get you the beginning to whatever is len(a).
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Python - Count elements in list [duplicate]
...tal number of objects in a nested list (including multidimensional lists). If you have numpy, use size(). Otherwise use list comprehensions within recursion.
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ATL CComPtr和CComQIPtr详解 - C/C++ - 清泛网 - 专注IT技能提升
...
void Func(IUnknown * punk)
{
CComQIPtr<IXXX> pno(punk);
if(pno)
{
//正确转换
pno->doSomething();
}
}
(2) 赋值
赋值的时候，发生下面三件事：
如果当前指针不为空，那么释放当前指针
如果源指针不为空，那...
Visul C++中CList用法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...g str1="hello";
CString str2="world";
CString str3="my";
CString str4="life";
list.AddTail(str1);
list.AddTail(str2);
list.AddTail(str3);
list.AddTail(str4);
POSITION pos = list.GetHeadPosition();
while(pos!=NULL)
{
CString data = list.GetNext(pos);
//do something
}
这样就...
Win32 创建控件风格不是Win XP的解决方案 - C/C++ - 清泛网 - 专注C/C++及内核技术
...，下面说一下解决方案吧：
这个根本办法就是加一个manifest文件，其内容如下：
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
<assemblyIdentity
name="XP style manifest"
...
MFC SetCursor设置手型鼠标光标 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
__super::OnMouseMove(nFlags, point);
int nIndex = HitTest(point);
if ( nIndex > -1 )
{
SetCursor(AfxGetApp()->LoadStandardCursor(IDC_HAND)); //手型光标
...
}
else
{
SetCursor(AfxGetApp()->LoadStandardCursor(IDC_ARROW)); //普通箭头光标
...
}
...
}
...
OnMouseMove nFlags的作用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...TTON当鼠标中键按下时。
MK_RBUTTON当鼠标右键按下时.
MK_SHIFT当SHIFT按下时。
注：point是相对位置，例如当窗口的左上角坐标为（10,10）那么当鼠标在屏幕的（10,10）像素点的时候，OnMouseMove函数point值为（0,0）因为是相对窗口左上...
PHP 错误记录和聚合的平台Sentry实战 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Client($dsn, $options);
while (($line = fgets(STDIN)) !== false) {
if (!preg_match("/{$pattern_content}/", $line, $match)) {
continue;
}
list($line, $timestamp, $level, $message) = $match;
$timestamp = gmdate('Y-m-d\TH:i:s\Z', strtotime($timestamp));
preg_m...
PhpCms v9 Tag url静态化全攻略 兼容\"+\",\"#\"等特殊字符 - 更多技术 - ...
...g/', $uri))));
$tag = urldecode($tag);
if (empty($tag)) {
$this->init();
exit;
}
$tag = safe_replace(addslashes($tag));
修改起来很简单，兼顾含特殊...