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C++ Dynamic Shared Library on Linux
...ass and define all the required functions virtual. The plugin author would then derive from MyClass, override the virtuals and implement create_object and destroy_object. Your main application would not need to be changed in any way.
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Lock, mutex, semaphore… what's the difference?
...0, if same thread that had previously called acquire(), now calls release, then the release is successful. If a different thread tried this -- it is down to the implementation/library as to what happens (usually the attempt ignored or an error is thrown). For semaphores in state 0, any thread can ca...
Will iOS launch my app into the background if it was force-quit by the user?
...ou kill your app from the app switcher
(i.e. swiping up to kill the app) then the OS will never relaunch the
app regardless of push notification or background fetch. In this case
the user has to manually relaunch the app once and then from that
point forward the background activities will b...
Java: how do I get a class literal from a generic type?
...
With this I was able create a class with a generic E and then use clzz = new TypeToken<E>(){}.getRawType(); to later iterate over similarly structured enums with clzz.getEnumConstants() and then finally use refection to call member methods a la Method method = clzz.getDeclare...
COUNT DISTINCT with CONDITIONS
...unt(distinct tag) as tag_count,
count(distinct (case when entryId > 0 then tag end)) as positive_tag_count
from
your_table_name;
The first count(distinct...) is easy.
The second one, looks somewhat complex, is actually the same as the first one, except that you use case...when clause. In th...
How to split a string, but also keep the delimiters?
...)
Where you can replace tilda (~) with an appropriate unique delimiter.
Then if you do a split on your new delimiter then i believe you will get the desired result.
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Best way to make Django's login_required the default
...eed to process URLs if user already logged in
if request.user.is_authenticated():
return None
# An exception match should immediately return None
for url in self.exceptions:
if url.match(request.path):
return None
# Requests m...
jquery data selector
.... The more features you add, the slower it'll be. If the logic is complex, then use $(foo).filter(function(){...}).
– James
May 24 '10 at 12:21
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When to use PNG or JPG in iPhone development?
... the quality of your JPG's in order to see a real benefit in file size but then you are displaying non-optimal images.
File size is certainly a factor but there are other considerations at play as well when choosing an image format.
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Does have to be in the of an HTML document?
...tribute that allowed style tags to be included everywhere in the body, but then they removed it again.
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