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Why does SIGPIPE exist?
...ing, SIGPIPE can only occur as the result of a write() , which can (and does) return -1 and set errno to EPIPE ... So why do we have the extra overhead of a signal? Every time I work with pipes I ignore SIGPIPE and have never felt any pain as a result, am I missing something?
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What is an invariant?
... be in other species of any mammal. The context changes, but the invariant does not change.
– eigenfield
Nov 9 '18 at 17:50
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Static method behavior in multi-threaded environment in java
...plex synchronisation mechanisms.
Note that sleeping is something a thread does to itself.
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Is a Python list guaranteed to have its elements stay in the order they are inserted in?
...that can contain duplicate elements and has a defined order that generally does not change unless explicitly made to do so. stacks and queues are both types of lists that provide specific (often limited) behavior for adding and removing elements (stacks being LIFO, queues being FIFO). Lists are prac...
What's the difference between OpenID and OAuth?
...ID - the most important feature of OpenID is its discovery process. OpenID does not require hard coding each the providers you want to use ahead of time. Using discovery, the user can choose any third-party provider they want to authenticate. This discovery feature has also caused most of OpenID's p...
In Objective-C why should I check if self = [super init] is not nil?
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For example:
[[NSData alloc] initWithContentsOfFile:@"this/path/doesn't/exist/"];
[[NSImage alloc] initWithContentsOfFile:@"unsupportedFormat.sjt"];
[NSImage imageNamed:@"AnImageThatIsntInTheImageCache"];
... and so on. (Note: NSData might throw an exception if the file doesn't exist). ...
Does static constexpr variable inside a function make sense?
If I have a variable inside a function (say, a large array), does it make sense to declare it both static and constexpr ? constexpr guarantees that the array is created at compile time, so would the static be useless?
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JavaScript property access: dot notation vs. brackets?
...n be any string, if you want to access a property named “2” or “John Doe”, you must use square brackets: value[2] or value["John Doe"]. This is the case even though you know the precise name of the property in advance, because neither “2” nor “John Doe” is a valid variable name and s...
Regex select all text between tags
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This does not select the text between the tags, it includes the tags.
– capikaw
Feb 1 '17 at 19:47
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In Django, how does one filter a QuerySet with dynamic field lookups?
...ser friendly (requires help from a tech person to create the query) but it does solve the problem. When creating the question, the editor can enter a dictionary into a custom field, e.g.:
{'is_staff':True,'last_name__startswith':'A',}
That string is stored in the database. In the view code, it co...