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What's the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)?
...ng at the source code, the synchronized map is only an implementation with one mutex (blocking) while the ConcurrentHashMap is more complex to deal with concurrent access
– Vinze
Feb 4 '09 at 9:36
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conditional unique constraint
...re i need to enforce a unique constraint on a set of columns, but only for one value of a column.
6 Answers
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Placement of the asterisk in pointer declarations
...'ve recently decided that I just have to finally learn C/C++, and there is one thing I do not really understand about pointers or more precisely, their definition.
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Lock-free multi-threading is for real threading experts
... through an answer that Jon Skeet gave to a question and in it he mentioned this:
6 Answers
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In jQuery, how do I select an element by its name attribute?
...iobutton value when clicking on it using jQuery?". A small difference, but one that baffled me for a bit.
– gargantuan
Mar 2 '12 at 10:13
1
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vector vs. list in STL
...that I didn't want the OP to think that the interface is not there in case one wants to shoot himself in the (performance) foot.
– Manuel
Feb 5 '10 at 18:22
16
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How to use git bisect?
... was working at the revision 0. So the regression was likely introduced in one of the commits 1, 2, 3, 4, 5, current.
You could try to check out each commit, build it, check if the regression is present or not. If there is a large number of commits, this can take a long time. This is a linear searc...
“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP
...value of an uninitialized variable is problematic in the case of including one file into another which uses the same variable name. It is also a major security risk with register_globals turned on. E_NOTICE level error is issued in case of working with uninitialized variables, however not in the cas...
What characters are forbidden in Windows and Linux directory names?
...r-case and lower-case characters, so you cannot create a folder named A if one named a already exists. Worse, seemingly-allowed names like PRN and CON, and many others, are reserved and not allowed. Windows also has several length restrictions; a filename valid in one folder may become invalid if mo...
What's the difference between KeyDown and KeyPress in .NET?
...ys the character resulting from a keypress, and is only called if there is one.
In other words, if you press A on your keyboard, you'll get this sequence of events:
KeyDown: KeyCode=Keys.A, KeyData=Keys.A, Modifiers=Keys.None
KeyPress: KeyChar='a'
KeyUp: KeyCode=Keys.A
But if you press Shift+A,...