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App Inventor 2 SideBarV2 侧边栏拓展 · App Inventor 2 中文网
...载：
co.com.dendritas.SidebarV2.zip
您的改进建议 联系方式： 不需要回复的可留空~ 意见反馈（300字以内）： 给个鼓励也行呐~o~ 提供截图（仅截取当前可视区域） ...
AppInventor2画布拖动事件中 起点、前点、当前点，都是啥意思？ - App应用...
...点、当前点，都是啥意思？
A：
起点：第一次触摸屏幕的位置。
前点：最后一次拖动前的位置。
当前点：当前拖动后最新的位置。
详见中文文档：https://www.fun123.cn/reference/ ... html#Canvas.Dragged
Skip List vs. Binary Search Tree
...tly linked to the affected node need to be locked.
Update from Jon Harrops comments
I read Fraser and Harris's latest paper Concurrent programming without locks. Really good stuff if you're interested in lock-free data structures. The paper focuses on Transactional Memory and a theoretical ope...
Should I use tag for icons instead of ? [closed]
...web designers care about alt tags. the spec is there for a reason. like ramps in buildings, alt, title and aria tags exist for a reason.
– osiris
Jul 30 '15 at 14:47
3
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What GRANT USAGE ON SCHEMA exactly do?
...user, and they affected the "postgres" database. I thought that if you run psql without -d db you're operating "outside" any db, but you're always connected to a db and by default you're connected to the db with the same name of your role. db = role = user = group... it's a bit confusing :D
...
How to read a large file - line by line?
.... I use something like 1000+ partial files commonly. Doing these tricks helps immensely with processing speed and memory limits.
The pandas dataframe.read_csv is single threaded so you can do these tricks to make pandas quite faster by running a map() for parallel execution. You can use htop to ...
What is the difference D3 datum vs. data?
...nd datum within an array (["a"] in the example above).
Hopefully this helps clarify how selection.data and selection.datum() differ from each other both when providing data as an input argument and when querying for the bound datum by not providing any input arguments.
PS - The best way to unders...
Optional Parameters with C++ Macros
... <code for four arguments>
// The interim macro that simply strips the excess and ends up with the required macro
#define XXX_X(x,A,B,C,D,FUNC, ...) FUNC
// The macro that the programmer uses
#define XXX(...) XXX_X(,##__VA_ARGS__,\
...
What's “wrong” with C++ wchar_t and wstrings? What are some alternatives to wide characters?
...andard library on Windows, but you can create a portable interface that wraps the standard library on other platforms and converts from UTF-8 to wchar_t directly before using Win32 W functions.
– bames53
Jun 25 '12 at 15:56
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How can I get a count of the total number of digits in a number?
...;
sw1.Stop();
Console.WriteLine($"IfChain: {sw1.ElapsedMilliseconds} ms");
Stopwatch sw2 = new Stopwatch();
sw2.Start();
for (int i = 0; i < size; ++i) samples[i].Digits_Log10();
sw2.Stop();
Console.WriteLine($"L...