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Removing list of vms in vagrant cache
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You should use the following command to remove invalid entries from the global index:
vagrant global-status --prune
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What is the Comonad typeclass in Haskell?
What is the Comonad typeclass in Haskell? As in Comonad from Control.Comonad in the comonad package (explanations of any other packages that provide a Comonad typeclass are also welcome). I've vaguely heard about Comonad, but all I really know about it is that is provides extract :: w a -> a ,...
Simple and fast method to compare images for similarity
... contribute an img_hash module to opencv_contrib, you can find the details from this link.
img_hash module provide six image hash algorithms, quite easy to use.
Codes example
origin lena
blur lena
resize lena
shift lena
#include <opencv2/core.hpp>
#include <opencv2/core/ocl.hpp>
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How to add dividers and spaces between items in RecyclerView?
...lication to add a special drawing and layout offset to specific item views from the adapter's data set. This can be useful for drawing dividers between items, highlights, visual grouping boundaries and more.
All ItemDecorations are drawn in the order they were added, before the item views (in onDraw...
Using boolean values in C
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From best to worse:
Option 1 (C99)
#include <stdbool.h>
Option 2
typedef enum { false, true } bool;
Option 3
typedef int bool;
enum { false, true };
Option 4
typedef int bool;
#define true 1
#define false 0
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Is errno thread-safe?
... identifier of an object. It might expand to a modifiable lvalue resulting from a function call (for example, *errno()).
Generally, errno is a macro which calls a function returning the address of the error number for the current thread, then dereferences it.
Here is what I have on Linux, in /usr...
Reverse a string in Python
... a new one.
Strings are sliceable. Slicing a string gives you a new string from one point in the string, backwards or forwards, to another point, by given increments. They take slice notation or a slice object in a subscript:
string[subscript]
The subscript creates a slice by including a colon w...
Start ssh-agent on login
I have a site as a remote Git repo pulling from Bitbucket.com using an SSH alias. I can manually start the ssh-agent on my server but I have to do this every time I login via SSH.
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Hibernate: hbm2ddl.auto=update in production?
...ng a db schema should be handled by the professionals ( dbas ). Recovering from a bad db change is difficult at best. Vova didn't mention it - but what happens if hibernate's update decides to drop a column and re-add it because the type or size changed. And lets say the column is all your users em...
How do I ignore files in a directory in Git?
...n of the .gitignore file (relative to the toplevel of the work tree if not from a .gitignore file).
Otherwise, git treats the pattern as a shell glob suitable for consumption by fnmatch(3) with the FNM_PATHNAME flag: wildcards in the pattern will not match a / in the pathname. For example, Documenta...