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Adding 'serial' to existing column in Postgres
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Look at the following commands (especially the commented block).
DROP TABLE foo;
DROP TABLE bar;
CREATE TABLE foo (a int, b text);
CREATE TABLE bar (a serial, b text);
INSERT INTO foo (a, b) SELECT i, 'foo ' || i::text FROM generate_series(1, 5) i;
INSERT INTO bar (b) SELECT 'ba...
Is there a better way to express nested namespaces in C++ within the header
... names. I find it improves readability, and helps document any given code block's dependencies. Apart from constants, I tend to try and keep it to two namespaces if possible (such as SysData::Exceptions and SysData::Classes).
– Justin Time - Reinstate Monica
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Handler vs AsyncTask vs Thread [closed]
...ashion, and—as with the main thread—an especially long work packet can block the queue. Due to this reason, use AsyncTask to handle work items shorter than 5ms in duration.
AsyncTask objects are also the most common offenders for implicit-reference issues. AsyncTask objects present risks relate...
Why does the use of 'new' cause memory leaks?
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In the first case, the objects are destroyed automatically when the scope block is exited. This could be a function or a scope-block within a function.
In the latter case the object b is destroyed together with the instance of A in which it is a member.
Objects are allocated with new when you nee...
In Vim, how do I apply a macro to a set of lines?
...ual selection or by a :40,50 / :+10
See http://www.vim.org/scripts/script.php?script_id=3271
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How to place and center text in an SVG rectangle
...o maintain compatibility with SVG 1.1:
http://wiki.inkscape.org/wiki/index.php/FAQ#What_about_flowed_text.3F
Furthermore, there are some JavaScript libraries that can be used to dynamically automate text wrapping:
http://www.carto.net/papers/svg/textFlow/
It's interesting to note CSVG's solution t...
Concurrent HashSet in .NET Framework?
... #endregion
}
}
EDIT: Move the entrance lock methods ouside the try blocks, as they could throw an exception and execute the instructions contained in the finally blocks.
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Set cursor position on contentEditable
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@NicoBurns right, but the code in the second conditional block (else if (document.createRange)) is what I'm looking at. It will only be called if window.getSelection doesn't exist, yet uses window.getSelection
– Sandy Gifford
May 5 '18 at 20:...
Android Archive Library (aar) vs standard jar
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I'm confused by this answer. The first block quote says that "aars and jars are packaged in with your app", not "shared across applications"; yet the second block quote implies that aars let you share classes and other resources between multiple apps?
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TCP 的那些事儿（上） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ransmitted Received ACK Sent
Segment Segment (Including SACK Blocks)
3000-3499 3000-3499 3500 (ACK dropped)
3500-3999 3500-3999 4000 (ACK dropped)
3000-3499 3000-3499 4000, SACK=3000-3500
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示例二，网络延误...