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IBOutlet and IBAction
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IBAction resolves to void and IBOutlet resolves to nothing, but they signify to Xcode and Interface builder that these variables and methods can be used in Interface builder to link UI elements to your code.
If you're not going to be using Interface Builder at all, then you don't need them in you...
rake db:schema:load vs. migrations
Very simple question here - if migrations can get slow and cumbersome as an app gets more complex and if we have the much cleaner rake db:schema:load to call instead, why do migrations exist at all?
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How to make a window always stay on top in .Net?
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Good question, if you wanted to swap between this top-most ability and the default behavior (for example, you have an "Always on top" checkbox for window behavior). I'd guess that maybe with the proper flags it would be possible. If you had...
How do you compare structs for equality in C?
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if the 2 structures variable are initialied with calloc or they are set with 0 by memset so you can compare your 2 structures with memcmp and there is no worry about structure garbage and this will allow you to earn time
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Android onCreate or onStartCommand for starting service
...alled once per instantiated object.
You only need to implement onCreate() if you actually want/need to initialize something only once.
onStartCommand() is called every time a client starts the service using startService(Intent intent). This means that onStartCommand() can get called multiple times...
Throwing exceptions from constructors
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Not really, in this specific case, note that his Mutex destructor will never be called, possibly leaking the pthread mutex. The solution to that is to use a smart pointer for the pthread mutex, better yet use boost mutexes or std::mutex, no reason t...
Removing duplicate rows in vi?
...one on each line). Some of these are duplicates, and I would like to know if it is possible (and if so, how) to remove any duplicates. I am interested in doing this from within vi/vim, if possible.
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Constructor in an Interface?
...n a class are defined for
every implementation of this interface."
"If a define a Interface for this class so that I can have more
classes which implement the message interface, I can only define the
send method and not the constructor"
...these requirements are exactly what abstract cl...
Creating a expressjs middleware that accepts parameters
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function HasRole(role) {
return function(req, res, next) {
if (role !== req.user.role) res.redirect(...);
else next();
}
}
I also want to make sure that I don't make multiple copies of the same function:
function HasRole(role) {
return HasRole[role] || (HasRole[role] = fun...
An algorithm for inflating/deflating (offsetting, buffering) polygons
... For anyone that wants to do this, another alternative is to use GEOS, and if your using python, GEOS's wrapper, Shapely. A really pretty example: toblerity.github.com/shapely/manual.html#object.buffer
– pelson
Oct 3 '12 at 8:04
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