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What does “&” at the end of a linux command mean?
... the "&" sign to run many processes through one (1) ssh connections in order to to keep minimum number of terminals. For example, I have one process that listens for messages in order to extract files, the second process listens for messages in order to upload files: Using the "&" I can run...
What does “O(1) access time” mean?
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You're going to want to read up on Order of complexity.
http://en.wikipedia.org/wiki/Big_O_notation
In short, O(1) means that it takes a constant time, like 14 nanoseconds, or three minutes no matter the amount of data in the set.
O(n) means it takes an amo...
Using helpers in model: how do I include helper dependencies?
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To access helpers from your own controllers, just use:
OrdersController.helpers.order_number(@order)
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c++ boost::multi_index composite keys efficiency - c++1y / stl - 清泛IT社区，为创新赋能！
...cumentation states that "Composite keys are sorted by lexicographical order, i.e. sorting is performed by the first key, then the second key if the first one is equal, etc". Does this mean that the structure is stored such that a lookup for a specific 2-part composite key will take O(n=1) ...
What is normalized UTF-8 all about?
The ICU project (which also now has a PHP library ) contains the classes needed to help normalize UTF-8 strings to make it easier to compare values when searching.
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What is ViewModel in MVC?
...w model properties are often related to data objects such as customers and orders and in addition, they also contain properties related to the page or application itself such as user name, application name, etc. View models provide a convenient object to pass to a rendering engine to create an HTML ...
Print text instead of value from C enum
...sday", /* ... etc ... */ };. You know, in case the days of the week are reordered, or you decide that Monday is the first day of the week.
– Tim Schaeffer
Jul 2 '10 at 20:13
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Simulating group_concat MySQL function in Microsoft SQL Server 2005?
... WHERE empName = a.empName
ORDER BY empName FOR xml path('')), ' ', REQUIRED SEPERATOR)
FROM project_members a
WHERE empName IS NOT NULL
GROUP BY empName
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Android Studio: Plugin with id 'android-library' not found
...ready mentioned by some of the other answers, you need the gradle tools in order to use it. Using 3.0.1, you have to use the google repo, not mavenCentral or jcenter:
buildscript {
repositories {
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//In IntelliJ or older versions of Android Studio
//maven {
// ...
Provide an image for WhatsApp link sharing
...However, be aware of the "please note" section above.
Step 7: og:type
In order for your object to be represented within the graph, you need to specify its type. Here's a list of the global types available: http://ogp.me/#types. You can also specify your own types.
<meta property="og:type" conte...