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Is errno thread-safe?
In errno.h , this variable is declared as extern int errno; so my question is, is it safe to check errno value after some calls or use perror() in multi-threaded code. Is this a thread safe variable? If not, then whats the alternative ?
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How to check if an element is in an array
In Swift, how can I check if an element exists in an array? Xcode does not have any suggestions for contain , include , or has , and a quick search through the book turned up nothing. Any idea how to check for this? I know that there is a method find that returns the index number, but is there ...
Shortcut to exit scale mode in VirtualBox [closed]
What is the shortcut to exit scale mode in Oracle VirtualBox, Windows 7 host?
9 Answers
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What is an abstract class in PHP?
What is an abstract class in PHP?
7 Answers
7
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How to write into a file in PHP?
I have this script on one free PHP-supporting server:
9 Answers
9
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Convert date to another timezone in JavaScript
I am looking for a function to convert date in one timezone to another.
24 Answers
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How to get a microtime in Node.js?
How can I get the most accurate time stamp in Node.js?
13 Answers
13
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Chrome Dev Tools: How to trace network for a link that opens a new tab?
I want to trace the network activity that happens when I click on a link. The problem is that the link opens a new tab, and apparently the Dev Tools works per tab it was open for. "Preserve Log Upon Navigation" does not help.
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Difference between Dictionary and Hashtable [duplicate]
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Simply, Dictionary<TKey,TValue> is a generic type, allowing:
static typing (and compile-time verification)
use without boxing
If you are .NET 2.0 or above, you should prefer Dictionary<TKey,TValue> (and the other generic collections)
A subtle but important difference is...
How do I create a unique constraint that also allows nulls?
I want to have a unique constraint on a column which I am going to populate with GUIDs. However, my data contains null values for this columns. How do I create the constraint that allows multiple null values?
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