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Checking network connection
...is not working, you can find a current IP address for google.com (on unix) by running
% dig google.com +trace
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google.com. 300 IN A 216.58.192.142
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Checking out Git tag leads to “detached HEAD state”
... a git checkout v2.0, you are switching to a commit that is not pointed to by a branch. The HEAD is now "detached" and not pointing to a branch. If you decide to make a commit now (as you may), there's no branch pointer to update to track this commit. Switching back to another commit will make you l...
What is aspect-oriented programming?
...mitted from the serialized object. Serialization is an aspect, implemented by other code in the system, and applied to your class by the application of a "configuration" attribute (decoration) .
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When should I use Kruskal as opposed to Prim (and vice versa)?
...an't make as strong promises about the cost of a particular operation, but by the time the algorithm is done, it will indeed by O(E+VlogV), even worst-case.
– agorenst
Jul 30 '09 at 16:49
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Getting the thread ID from a thread
...proach to identify threads as the ManagedThreadId property id's get reused by your app. So it is not a reliable identifier for threads in some scenarios and you will experience the exception : "An item with the same key has already been added." at line... Give the thread a unique name when you creat...
What command opens Ruby's REPL?
What command opens Ruby's REPL?
2 Answers
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Is Meyers' implementation of the Singleton pattern thread safe?
...r comments.
In C++03, this code wasn't thread safe. There is an article by Meyers called "C++ and the Perils of Double-Checked Locking" which discusses thread safe implementations of the pattern, and the conclusion is, more or less, that (in C++03) full locking around the instantiating method is ...
How to return a part of an array in Ruby?
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Yes, Ruby has very similar array-slicing syntax to Python. Here is the ri documentation for the array index method:
--------------------------------------------------------------- Array#[]
array[index] -> obj...
How to do an INNER JOIN on multiple columns
...ct and I'm supposed to perform a database query which finds flights either by the city name or the airport code, but the flights table only contains the airport codes so if I want to search by city I have to join on the airports table.
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Difference between .tagName and .nodeName
...Level-3-Core/core.html#ID-104682815
btw the Node interface is implemented by every node in the DOM tree (including the document object itself). The Element interface is implemented only by those nodes in the DOM tree that represent elements in an HTML document (nodes with nodeType === 1) .
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