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What really happens in a try { return x; } finally { x = null; } statement?
... [0] int32 CS$1$0000)
L_0000: call int32 Program::SomeNumber()
L_0005: stloc.0
L_0006: leave.s L_000e
L_0008: call void Program::Foo()
L_000d: endfinally
L_000e: ldloc.0
L_000f: ret
.try L_0000 to L_0008 finally handler L_0008 to L_000e
}
This basically declares...
VC MFC工具栏(CToolBar)控件 - C/C++ - 清泛网 - 专注C/C++及内核技术
...o);
编译,运行效果如下:
为工具栏按钮添加鼠标停留提示信息
以上面的工程为例子,在对话类里添加一个成员变量CString str;
接着在m_Toolbar调用CreateEx函数后,调用这个语句: m_Toolbar.EnableToolTips();//激活信息提示功能
然后...
Using getopts to process long and short command line options
...cter followed by a colon into the optspec:
#!/usr/bin/env bash
optspec=":hv-:"
while getopts "$optspec" optchar; do
case "${optchar}" in
-)
case "${OPTARG}" in
loglevel)
val="${!OPTIND}"; OPTIND=$(( $OPTIND + 1 ))
echo...
Real life example, when to use OUTER / CROSS APPLY in SQL
...(Foo2, Bar2),
(Foo3, Bar3)) V(Foo, Bar);
In 2005 UNION ALL can be used instead.
SELECT Id,
Foo,
Bar
FROM T
CROSS APPLY (SELECT Foo1, Bar1
UNION ALL
SELECT Foo2, Bar2
UNION ALL
...
Scala: Abstract types vs generics
...bstraction" written by... Martin Odersky, and Matthias Zenger for OOPSLA 2005, referenced in the publications of the project Palcom (finished in 2007).
Relevant extracts
Definition
Abstract type members provide a flexible way to abstract over concrete types of components.
Abstract types can ...
Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...隔。
后台任务要尽可能少的唤醒CPU,譬如IM通信的长连接心跳时间间隔、一些应用的后台定时唤醒时间间隔等要设计合理。
特殊耗电业务情况可以进行弹窗等友好的交互设计提醒用户该操作会耗用过多电量。
可以看...
Create list of single item repeated N times
...
answered Aug 11 '10 at 14:05
gaefangaefan
13.3k1414 gold badges4848 silver badges9494 bronze badges
...
Assignment inside lambda expression in Python
...was shown :)
– jno
Jan 31 '13 at 16:05
...
Regular expression to match non-ASCII characters?
...
var words_in_text = function (text) {
var regex = /([\u0041-\u005A\u0061-\u007A\u00AA\u00B5\u00BA\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052...
MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升
...下文的,最好放在MongoDB的启动脚本里。
有时候,MongoDB连接数过多的话,会拖累性能,可以通过serverStatus查询连接数:
mongo> db.serverStatus().connections
每个连接都是一个线程,需要一个Stack,Linux下缺省的Stack设置一般比较大:
...