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Python memoising/deferred lookup property decorator
...f the instance, but they're a real bottleneck to calculate that first time and only really accessed for special cases. Hence they can also be cached after they've been retrieved from the database (this therefore fits the definition of memoisation where the input is simply "no input").
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How to ignore certain files in Git
...racked before (by git add). Run git reset name_of_file to unstage the file and keep it. In case you want to also remove the given file from the repository (after pushing), use git rm --cached name_of_file.
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Get a pixel from HTML Canvas?
....getContext('2d');
// Get the CanvasPixelArray from the given coordinates and dimensions.
var imgd = context.getImageData(x, y, width, height);
var pix = imgd.data;
// Loop over each pixel and invert the color.
for (var i = 0, n = pix.length; i < n; i += 4) {
pix[i ] = 255 - pix[i ]; // r...
Is sizeof(bool) defined in the C++ language standard?
I can't find an answer in the standard documentation. Does the C++ language standard require sizeof(bool) to always be 1 (for 1 byte), or is this size implementation-defined?
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Debugging App When Launched by Push Notification
...several different types of push notifications my app can receive. The PHP handles this and sends different packets of information to my app which are all received just fine.
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How do I assert equality on two classes without an equals method?
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@PiotrAleksanderChmielowski, sorry, when working with Spring+JPA+Entities, the Entity object may have an id (representing the id field of the database table), so when it is empty (a new object not yet stored on the DB), refEq fails to c...
Sending POST data in Android
I'm experienced with PHP, JavaScript and a lot of other scripting languages, but I don't have a lot of experience with Java or Android.
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Adding values to a C# array
Probably a really simple one this - I'm starting out with C# and need to add values to an array, for example:
23 Answers
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Can you get the column names from a SqlDataReader?
...nnames in lowercase. Column names in table are all uppercase like OBJECTID and reader is returning lowercase like objectid
– Muneem Habib
Nov 17 '15 at 11:30
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Converting Mercurial folder to a Git repository
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If you are on Windows machine use the Git bash and run hg-fast-export.sh
– Augustas
Dec 7 '17 at 13:45
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