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How does HashSet compare elements for equality?
...ill find the hash code using IEqualityComparer<T>.GetHashCode, and store both the hash code and the element (after checking whether the element is already in the set, of course).
To look an element up, it will first use the IEqualityComparer<T>.GetHashCode to find the hash code, then fo...
What is the meaning of “non temporal” memory accesses in x86
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Non-Temporal SSE instructions (MOVNTI, MOVNTQ, etc.), don't follow the normal cache-coherency rules. Therefore non-temporal stores must be followed by an SFENCE instruction in order for their results to be seen by other processors in...
Get file name from URL
In Java, given a java.net.URL or a String in the form of http://www.example.com/some/path/to/a/file.xml , what is the easiest way to get the file name, minus the extension? So, in this example, I'm looking for something that returns "file" .
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django admin - add custom form fields that are not part of the model
...te. One of its fields is a long string expression. I'd like to add custom form fields to the add/update page of this model in the admin that based on these fields values I will build the long string expression and save it in the relevant model field.
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How to change column datatype from character to numeric in PostgreSQL 8.4
... data type to new. A USING clause must be provided if there is no implicit or assignment cast from old to new type.
So this might work (depending on your data):
alter table presales alter column code type numeric(10,0) using code::numeric;
-- Or if you prefer standard casting...
alter table presa...
How can I extract audio from video with ffmpeg?
... audio stream it is, use ffprobe input-video.avi
– FlorianB
Dec 2 '16 at 6:45
16
If you only extr...
Does setWidth(int pixels) use dip or px?
Does setWidth(int pixels) use device independent pixel or physical pixel as unit?
For example, does setWidth(100) set the a view's width to 100 dips or 100 pxs?
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Git: How to reuse/retain commit messages after 'git reset'?
As Git user I regular come across the situation, that I need to rework one or more commits in a way which do not fit into --amend or rebase -i with fixup commits. Typically I would do something like
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Generate random 5 characters string
...crotime()),rand(0,26),5);
Would be my best guess--Unless you're looking for special characters, too:
$seed = str_split('abcdefghijklmnopqrstuvwxyz'
.'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
.'0123456789!@#$%^&*()'); // and any other characters
shuffle($seed); // probably...
How can I combine two commits into one commit? [duplicate]
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You want to git rebase -i to perform an interactive rebase.
If you're currently on your "commit 1", and the commit you want to merge, "commit 2", is the previous commit, you can run git rebase -i HEAD~2, which will spawn an editor listing all the commits th...