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Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...L is always power of 2.
The six comes from fact that 2^6 == 64 bytes is standard size of cache line.
Now what does this mean? Well it means that if I have address X and address Y and
(X >> 6) - (Y >> 6) is divisible by L (i.e. some large power of 2), they will be stored in the same ca...
Best practices for styling HTML emails [closed]
...ewsletter. I've learned that many email clients ignore linked stylesheets, and many others (including Gmail) ignore CSS block declarations altogether. Are inline style attributes my only choice? What are the best practices for styling HTML emails?
...
Can you use CSS to mirror/flip text?
...orm: scale(-1, 1);
-ms-transform: scale(-1, 1);
transform: scale(-1, 1);
And a vertical flip would involve scaling the div like this:
-moz-transform: scale(1, -1);
-webkit-transform: scale(1, -1);
-o-transform: scale(1, -1);
-ms-transform: scale(1, -1);
transform: scale(1, -1);
DEMO:
spa...
Color Tint UIButton Image
...o match the tint of the segmented control. I thought this was really cool, and was wondering if I could do this elsewhere as well. For example, I have a bunch of buttons that have a uniform shape but varied colors. Instead of making a PNG for each button, could I somehow use this color masking to us...
How do I enable TODO/FIXME/XXX task tags in Eclipse?
...ecause I have been using those tags for as long as I've been using Eclipse and I have never seen one of them appear in the task list. Can anyone indicate how to enable this feature? I see no preferences option anywhere that says anything to the effect of 'Let my source code tags appear in the task l...
How to Deal with Temporary NSManagedObject instances?
I need to create NSManagedObject instances, do some stuff with them and then trash them or store to sqlite db. The problem is, I cannot create instances of NSManagedObject unconnected to NSManagedObjectContext and this means I have to clear up somehow after I decide that I don't need some of ...
Getting the parent of a directory in Bash
...
and the variant I'm using to get the parent of current working directory: parentdir=$(dirname `pwd`)
– TheGrimmScientist
Jul 11 '15 at 21:31
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What belongs in an educational tool to demonstrate the unwarranted assumptions people make in C/C++?
...e to prepare a little educational tool for SO which should help beginners (and intermediate) programmers to recognize and challenge their unwarranted assumptions in C, C++ and their platforms.
...
On a CSS hover event, can I change another div's styling? [duplicate]
...e adjacent sibling combinator (+).
If there are other elements between #a and #b, you can use this: http://jsfiddle.net/u7tYE/1/
#a:hover ~ #b {
background: #ccc
}
<div id="a">Div A</div>
<div>random other elements</div>
<div>random other elements</div>
<...
public friend swap member function
In the beautiful answer to the copy-and-swap-idiom there is a piece of code I need a bit of help:
2 Answers
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