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Is iterating ConcurrentHashMap values thread safe?
... obtain from a ConcurrentHashMap is designed to be used by a single thread and should not be passed around. This includes the syntactic sugar that the for-each loop provides.
What happens if I try to iterate the map with two threads at the same time?
It will work as expected if each of the thr...
python numpy machine epsilon
I am trying to understand what is machine epsilon. According to the Wikipedia, it can be calculated as follows:
3 Answers
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Iterating through directories with Python
I need to iterate through the subdirectories of a given directory and search for files. If I get a file I have to open it and change the content and replace it with my own lines.
...
Location of sqlite database on the device
...base programmatically with the default way of extending SQLiteOpenHelper and overriding onCreate() . This way the db gets created on the fly when needed.
...
How to set iPhone UIView z index?
...o move one view on top of another, how can I know the z index of the view, and how to move on to top?
9 Answers
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How to read the mode field of git-ls-tree's output
...digits show file type, the third one is about set-uid/set-gid/sticky bits, and you know the last three.
Here is how man 2 stat documents it on my GNU/Linux system:
The following flags are defined for the st_mode field:
S_IFMT 0170000 bit mask for the file type bit fields
S_...
Updating and committing only a file's permissions using git version control
...file mode.
Look into your project, in the .git folder for the config file and you should see something like this:
[core]
filemode = false
You can either change it to true in your favorite text editor, or run:
git config core.filemode true
Then, you should be able to commit normally your f...
jQuery how to bind onclick event to dynamically added HTML element [duplicate]
...ore than one element, a clone of the element to append is created for each and thus the attached event observer is lost.
An alternative way to do it would be to create the link for each element:
function handler() { alert('hello'); }
$('.add_to_this').append(function() {
return $('<a>Click...
Create thumbnail image
...23aykb%28v=vs.110%29.aspx
Here's a rough example that takes an image file and makes a thumbnail image from it, then saves it back to disk.
Image image = Image.FromFile(fileName);
Image thumb = image.GetThumbnailImage(120, 120, ()=>false, IntPtr.Zero);
thumb.Save(Path.ChangeExtension(fileName, "...
method overloading vs optional parameter in C# 4.0 [duplicate]
...DoFoo(c:"Hello There, John Doe")
This call takes parameter a value as 10 and parameter b as 23.
Another variant of this call - notice you don't need to set the parameter values in the order as they appear in the method signature, the named parameter makes the value explicit.
DoFoo(c:"hello again...