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What do the makefile symbols $@ and $< mean?
...ific situations such as arguments to linkers where
duplicate values have meaning.
$*: The stem of the target filename. A stem is typically a filename
without its suffix. Its use outside of pattern rules is
discouraged.
In addition, each of the above variables has two variants for
c...
What are the differences between a clustered and a non-clustered index?
...n index read AND THEN the table read. It's faster to range scan (if that's meaningful) because the data is stored in order. i.e. the clustering factor is perfect.
– Stephanie Page
Apr 27 '12 at 2:52
...
Creating an abstract class in Objective-C
...he biggest issue for developers coming from other languages where abstract means "cannot instantiate an object of this type" in Obj-C it means "things will go wrong at runtime when you instantiate this class".
– Cross_
Jul 7 '15 at 19:44
...
Get $_POST from multiple checkboxes
...box" value="checked">
Where [1] [2] [3] are the IDs of your messages, meaning that you will echo your $row['Report ID'] in their place.
Then, when you submit the form, your PHP array will look like this:
print_r($check_list)
[1] => checked
[3] => checked
Depending on which were checke...
How to get nice formatting in the Rails console
... v2.0 will require Ruby v1.9.3 or later and Rails v3.0 or later. Does this mean that the gem is outdated with these versions and cause conflicts??
– ltdev
Feb 6 '17 at 15:17
a...
How to set a Fragment tag by code?
...
I got what you mean. Thanks!
–
Actual meaning of 'shell=True' in subprocess
...nd tell it to run the command. In other words, using an intermediate shell means that variables, glob patterns, and other special shell features in the command string are processed before the command is run. Here, in the example, $HOME was processed before the echo command. Actually, this is the cas...
How do I make and use a Queue in Objective-C?
... NSArray (and NSMutableArray by extension) is a class cluster, meaning it has several private implementations that may be used interchangeably behind the scenes. The one you get usually depends on the number of elements. Also, Apple is free to change the details of any given implementati...
What does “xmlns” in XML mean?
...p://schemas.android.com/apk/res/android:foo /> with regards to what it "means" when an XML parser reads the document.
NOTE: You cannot actually use the full namespace URI in place of the namespace prefix in an XML instance document.
Check out this tutorial on namespaces: http://www.sitepoint.c...
How to set a selected option of a dropdown list control using angular JS
...e selected item in the control and the value of item.selectedVariant. This means that changing item.selectedVariant in JavaScript, or changing the value in the control, updates the other. If item.selectedVariant has a value of 0, that item should get selected.
If variants is an array of objects, it...