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Determine on iPhone if user has enabled push notifications
I'm looking for a way to determine if the user has, via settings, enabled or disabled their push notifications for my application.
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How to check if element in groovy array/hash/collection/list?
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.contains() is the best method for lists, but for maps you will need to use .containsKey() or .containsValue()
[a:1,b:2,c:3].containsValue(3)
[a:1,b:2,c:3].containsKey('a')
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iPhone and OpenCV
I know that OpenCV was ported to Mac OS X , however I did not find any info about a port to the iPhone.
13 Answers
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Any idea why I need to cast an integer literal to (int) here?
...) -128; // doesn't compile
Integer i3 = (Integer) (-128); // compiles
According to BoltClock in the comments the cast to int works as intended, because it is a reserved word and therefore can't be interpreted as an identifier, which makes sense to me.
And Bringer128 found the JLS Reference 15.16...
Dictionary returning a default value if the key does not exist [duplicate]
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TryGetValue will already assign the default value for the type to the dictionary, so you can just use:
dictionary.TryGetValue(key, out value);
and just ignore the return value. However, that really will just return default(TValue), not some custom default value (nor, more ...
Why doesn't os.path.join() work in this case?
The below code will not join, when debugged the command does not store the whole path but just the last entry.
14 Answers
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How to split a sequence into two pieces by predicate?
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One can shorten the function inside partition to _ % 2 == 0.
– k0pernikus
Aug 21 '19 at 14:11
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AES vs Blowfish for file encryption
... goal is that to prevent anyone to read the file who doesn't have the password.
7 Answers
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Setting WPF image source in code
... in the project. By looking at examples I've come up with the below code. For some reason it doesn't work - the image does not show up.
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Recursive lambda functions in C++11
...tween the auto version and the fully specified type version. The auto keyword infers its type from whatever it's initialized with, but what you're initializing it with needs to know what its type is (in this case, the lambda closure needs to know the types it's capturing). Something of a chicken-a...