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动态追踪（Dynamic Tracing）技术漫谈 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...特殊的语法用以指定“探针”，这个“探针”通常有一个位置描述的信息。你可以把它定位在某个内核函数的入口或出口，抑或是某个用户态进程的 函数入口或出口，甚至是任意一条程序语句或机器指令上面。编写 D 语言的调...
Is there a concise way to iterate over a stream with indices in Java 8?
...ex()
.filter( namesWithIndex -> namesWithIndex.v1.length() <= namesWithIndex.v2 + 1)
.toList();
Seq also supports just Seq.of(names) and will build a JDK Stream under the covers.
The simple-react equivalent would similarly look like
LazyF...
乐高机器人®组件 · App Inventor 2 中文网
...器人上输入传感器的缩放值。
ResetMotorPosition 重置马达位置(motorPortLetter,relative)
重置马达位置。
SetBrickName 设置砖块名称(name)
设置机器人的砖块名称。
SetInputMode 设置输入模式(sensorPortLetter,sensorType,sensorMode)
配置机器人...
How to find gaps in sequential numbering in mysql?
...sible) answer
Here's version that works on table of any size (not just on 100 rows):
SELECT (t1.id + 1) as gap_starts_at,
(SELECT MIN(t3.id) -1 FROM arrc_vouchers t3 WHERE t3.id > t1.id) as gap_ends_at
FROM arrc_vouchers t1
WHERE NOT EXISTS (SELECT t2.id FROM arrc_vouchers t2 WHERE t2.i...
What is the difference between '/' and '//' when used for division?
...s floor, so rounding is always down towards more negative. Some examples: -100 // 33 => -4; 100 // -33 => -4; but because of the rounding direction of floor func, the next one could seem counter-intuitive when compared to previous: -100 // -33 => 3.
– Erdős-Bacon
...
git pull while not in a git directory
...8fb84382b ("Introduce <branch>@{upstream} notation", 2009-09-10, Git v1.7.0-rc0 -- merge), the git -C option wasn't available yet (since it was introduced in 44e1e4d67d ("git: run in a directory given with -C option", 2013-09-09, Git v1.8.5-rc0 -- merge listed in batch #5)).
As a result, the...
Why is printing to stdout so slow? Can it be sped up?
...ile writing test on my machine, and with buffering, it also 0.05s here for 100,000 lines.
However, with the above modifications to write unbuffered, it takes 40 seconds to write only 1,000 lines to disk. I gave up waiting for 100,000 lines to write, but extrapolating from the previous, it would tak...
Performance of Arrays vs. Lists
...Stopwatch watch = Stopwatch.StartNew();
for (int rpt = 0; rpt < 100; rpt++)
{
int len = list.Count;
for (int i = 0; i < len; i++)
{
chk += list[i];
}
}
watch.Stop();
Console.WriteLine("List/...
How to calculate age (in years) based on Date of Birth and getDate()
...ECT
(CONVERT(int,CONVERT(char(8),@Now,112))-CONVERT(char(8),@Dob,112))/10000 AS AgeIntYears
you can change the above 10000 to 10000.0 and get decimals, but it will not be as accurate as the method below.
BEST METHOD FOR YEARS IN DECIMAL
DECLARE @Now datetime, @Dob datetime
SELECT @Now='19...
BLE（二）信道&数据包&协议栈格式 - 创客硬件开发 - 清泛IT社区，...
...采集。
这些信息往往都很简单，如温度、湿度、速度、位置信息、电量、水压、等等。
采集的过程也很简单，节点设备定时的向中心设备汇报信息数据，或者，中心设备在需要的时候主动查询。
基于信息采集的需求，BLE抽象...