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Undefined reference to vtable
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The GCC FAQ has an entry on it:
The solution is to ensure that all virtual methods that are not pure are defined. Note that a destructor must be defined even if it is declared pure-virtual [class.dtor]/7.
Therefore, you need to provide a definition fo...
How to count the number of set bits in a 32-bit integer?
8 bits representing the number 7 look like this:
55 Answers
55
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What is the difference between atomic / volatile / synchronized?
...e int counter;
public int getNextUniqueIndex() {
return counter++;
}
It basically reads value from memory, increments it and puts back to memory. This works in single thread but nowadays, in the era of multi-core, multi-CPU, multi-level caches it won't work correctly. First of all it introduce...
Panel.Dock Fill ignoring other Panel.Dock setting
If you create a panel on a form and set it to Dock=Top and drop another panel and set its Dock=Fill, it may fill the entire form, ignoring the first panel. Changing the tab order does nothing.
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Difference between ApiController and Controller in ASP.NET MVC
I've been playing around with ASP.NET MVC 4 beta and I see two types of controllers now: ApiController and Controller .
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Difference between 2 dates in SQLite
How do I get the difference in days between 2 dates in SQLite? I have already tried something like this:
12 Answers
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Are there any naming convention guidelines for REST APIs? [closed]
...PIs, are there any guidelines or defacto standards for naming conventions within the API (eg: URL endpoint path components, querystring parameters)? Are camel caps the norm, or underscores? others?
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iPhone app signing: A valid signing identity matching this profile could not be found in your keycha
...ted provisioning profile all seems to work as expected, so problem is definitely solved :)
Update: you may have to contact Apple to get a "Renew"-button, or they removed it -- and the solution is to just download it and add it to the keychain, no need to renew.
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Test whether string is a valid integer
...ser provided a valid integer, the script does one thing, and if not valid, it does something else. Trouble is, I haven't found an easy (and reasonably elegant) way of doing this - I don't want to have to pick it apart char by char.
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How can I update a single row in a ListView?
I have a ListView which displays news items. They contain an image, a title and some text. The image is loaded in a separate thread (with a queue and all) and when the image is downloaded, I now call notifyDataSetChanged() on the list adapter to update the image. This works, but getView() is g...