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Why covariance and contravariance do not support value type
...get variance.
The easiest way to see the difference is simply consider an Array: an array of Value types are put together in memory contiguously (directly), where as an array of Reference types only have the reference (a pointer) contiguously in memory; the objects being pointed to are separately a...
How is Perl's @INC constructed? (aka What are all the ways of affecting where Perl modules are searc
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We will look at how the contents of this array are constructed and can be manipulated to affect where the Perl interpreter will find the module files.
Default @INC
Perl interpreter is compiled with a specific @INC default value. To find out this value, run env -i...
Where do I put image files, css, js, etc. in Codeigniter?
...se_url() access.
application/config/autoload.php:
$autoload['helper'] = array('url','utility');
You will then have access to asset_url() throughout your code.
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jQuery object equality
...mine if two jQuery objects are equal? I would like to be able to search an array for a particular jQuery object.
7 Answers
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Rails select helper - Default selected value, how?
...e this solution out until I noticed your closing bracket around the values array BEFORE the comma that separates your default value... I missed this bracket here value3], default
– BigRon
Apr 4 '15 at 16:57
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Java ArrayList copy
I have an ArrayList l1 of size 10. I assign l1 to new list reference type l2 . Will l1 and l2 point to same ArrayList object? Or is a copy of the ArrayList object assigned to l2 ?
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What is The Rule of Three?
...rs,
but copying the name member merely copies a pointer, not the character array it points to!
This has several unpleasant effects:
Changes via a can be observed via b.
Once b is destroyed, a.name is a dangling pointer.
If a is destroyed, deleting the dangling pointer yields undefined behavior.
Sin...
Adding a directory to $LOAD_PATH (Ruby)
... you type script/console in your Rails project and enter $:, you'll get an array that includes all the directories needed to load Ruby. The take-away from this little exercise is that $: is an array. That being so, you can perform functions on it like prepending other directories with the unshift ...
How to do this in Laravel, subquery where in
...ow. But where_in (laravel 3) requires 2 arguments, the second one being an array. Any idea how to get this right? Also, I don't think laravel 3 supports the from method.
– Marc Buurke
May 29 '13 at 14:11
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How do I make a matrix from a list of vectors in R?
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simplify2array is a base function that is fairly intuitive. However, since R's default is to fill in data by columns first, you will need to transpose the output. (sapply uses simplify2array, as documented in help(sapply).)
> t(si...