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How to specialize std::hash::operator() for user-defined type in unordered containers?
To support user-defined key types in std::unordered_set<Key> and std::unordered_map<Key, Value>
one has to provide operator==(Key, Key) and a hash functor:
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Split list into smaller lists (split in half)
...mber of parts you want, not just split 'in half'):
EDIT: updated post to handle odd list lengths
EDIT2: update post again based on Brians informative comments
def split_list(alist, wanted_parts=1):
length = len(alist)
return [ alist[i*length // wanted_parts: (i+1)*length // wanted_parts]...
How to use MySQL DECIMAL?
...
DOUBLE columns are not the same as DECIMAL columns, and you will get in trouble if you use DOUBLE columns for financial data.
DOUBLE is actually just a double precision (64 bit instead of 32 bit) version of FLOAT. Floating point numbers are approximate representations of real...
How do I discover memory usage of my application in Android?
How can I find the memory used on my Android application, programmatically?
9 Answers
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Android - Back button in the title bar
In many apps (Calendar, Drive, Play Store) when you tap a button and enter a new activity, the icon in the title bar turns into a back button, but for the app I am making, it doesn't do that. How do I make that icon take you back to the previous screen?
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Copy a file in a sane, safe and efficient way
... std::ios::binary);
dst << src.rdbuf();
}
This is so simple and intuitive to read it is worth the extra cost. If we were doing it a lot, better to fall back on OS calls to the file system. I am sure boost has a copy file method in its filesystem class.
There is a C method for intera...
Boost Statechart vs. Meta State Machine
...tly boost contains two separate libraries for state machines: Statechart and Meta State Machine (MSM). The taglines give very similar descriptions:
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In Flux architecture, how do you manage Store lifecycle?
...about Flux but the example Todo app is too simplistic for me to understand some key points.
3 Answers
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Use of 'const' for function parameters
... you just make functions const when necessary or do you go the whole hog and use it everywhere? For example, imagine a simple mutator that takes a single boolean parameter:
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How to change ProgressBar's progress indicator color in Android
.... This is from the layout that has the progress bar:
<ProgressBar
android:id="@+id/ProgressBar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:indeterminate="false"
android:maxHeight="10dip...