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Example for boost shared_mutex (multiple reads/one write)?
I have a multithreaded app that has to read some data often, and occasionally that data is updated. Right now a mutex keeps access to that data safe, but it's expensive because I would like multiple threads to be able to read simultaneously, and only lock them out when an update is needed (the updat...
How do I create an average from a Ruby array?
...void integer division or your results will be wrong. Also, this isn't generally applicable to every possible element type (obviously, an average only makes sense for things that can be averaged). But if you want to go that route, use this:
class Array
def sum
inject(0.0) { |result, el| result...
How do you tell if caps lock is on using JavaScript?
... you are interested in, may be by using a keymapping array which will hold all the valid use case keys you are addressing...
uppercase A-Z or 'Ä', 'Ö', 'Ü',
lowercase a-Z or 0-9 or 'ä', 'ö', 'ü'
The above keys are just sample representation.
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How to replace an item in an array with Javascript?
... If anything, this would be the most efficient answer posted for replacing all occurances
– Tobiq
Mar 3 '19 at 13:50
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How does an underscore in front of a variable in a cocoa objective-c class work?
...to-generated accessor (for the property) knows which ivar to use. Specifically, in your implementation file, your synthesize should look like this:
@synthesize missionName = _missionName;
More generically, this is:
@synthesize propertyName = _ivarName;
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open read and close a file in 1 line of code
...
You don't really have to close it - Python will do it automatically either during garbage collection or at program exit. But as @delnan noted, it's better practice to explicitly close it for various reasons.
So, what you can do to keep ...
How do I get the full path to a Perl script that is executing?
...me of the script during execution. I discovered that depending on how you call the script $0 varies and sometimes contains the fullpath+filename and sometimes just filename . Because the working directory can vary as well I can't think of a way to reliably get the fullpath+filename of the scr...
How to indent a few lines in Markdown markup?
I want to write a few lines of text. They should be formatted normally except each line should start at the 6th column. I.e. I don't want the code block formatting rule to make this chunk of text look like code as I'll use other formatting like bold face, etc. How to do that in Markdown?
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How do you access a website running on localhost from iPhone browser
...ever port your website is running on) in the inbound security of your firewall if you are running one.
Note: don't forget the app's port if what you want is to debug the app in
your iPhone's browser like: http://192.168.0.102:3000. In this example 3000 is the default port used by ReactJS.
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node.js database [closed]
... EC2 with ease. Also, note that we are not using Mongoose. Talking about challenges (assuming you are already good at Node), you need to be good at Mongo way of doing the things (querying and aggregation ) for any serious application or service development. Learning how Mongo is different from other...