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What is the reason for performing a double fork when creating a daemon?
... without a controlling terminal, it's possible for
it to acquire one by opening a terminal in the future (System V-
based systems). This second fork guarantees that the child is no
longer a session leader, preventing the daemon from ever acquiring
a controlling terminal.
S...
What character encoding should I use for a HTTP header?
...
In short: Only ASCII is guaranteed to work. Some non-ASCII bytes are allowed for backwards compatibility, but are not supposed to be displayable.
HTTPbis gave up and specified that in the headers there is no useful encoding besides ASCII:
Historically, HTTP has allowed field con...
How to get the name of enumeration value in Swift?
...ode 7 beta 5 (Swift version 2) you can now print type names and enum cases by default using print(_:), or convert to String using String's init(_:) initializer or string interpolation syntax. So for your example:
enum City: Int {
case Melbourne = 1, Chelyabinsk, Bursa
}
let city = City.Melbourn...
Fatal error: unexpectedly found nil while unwrapping an Optional values [duplicate]
...ueReusableCellWithIdentifier(identifier: String!) -> AnyObject! // Used by the delegate to acquire an already allocated cell, in lieu of allocating a new one.
That's determined by the exclamation mark after AnyObject:
AnyObject!
So, first thing to consider is, what is an "Implicitly Unwr...
Should accessing SharedPreferences be done off the UI Thread?
... this wonderful post, find below the link to the blog post mentioned above by @Brad Fitzpatrick : android developer's blog post on strict mode by Brad . The post also has a link to sample code for using apply(from gingerbread onwards) or commit(froyo) based on the android version for storing shared...
Combining C++ and C - how does #ifdef __cplusplus work?
...m a little confused about how the C and C++ interact. I understand that by wrapping the C code with extern "C" the C++ compiler will not mangle the C code's names, but I'm not entirely sure how to implement this.
...
Method names for getting data [closed]
...ke get and fetch have
no specific semantic and are interpreted differently by different
people. Pick a semantic for a term, document what it is intended to
imply if the semantic is not clear and be consistent with its use.
words with vague or ambigious meanings are given different semantics by diffe...
How do you see the entire command history in interactive Python?
..., and I Cmd + K (cleared) my earlier commands. I can go through them one by one using the arrow keys. But is there an option like the --history option in bash shell, which shows you all the commands you've entered so far?
...
Explain ExtJS 4 event handling
...
Let's start by describing DOM elements' event handling.
DOM node event handling
First of all you wouldn't want to work with DOM node directly. Instead you probably would want to utilize Ext.Element interface. For the purpose of assigni...
Change values while iterating
...ied, making the original value untouchable.
This behavior is demonstrated by the following code:
x := make([]int, 3)
x[0], x[1], x[2] = 1, 2, 3
for i, val := range x {
println(&x[i], "vs.", &val)
}
The code prints you completely different memory locations for the value from range a...