大约有 13,700 项符合查询结果（耗时：0.0418秒） [XML]
Difference between TCP and UDP?
...ails (holding them in memory) for two minutes, during a state known as TIME_WAIT_2. This is a feature which defends against erroneously repeated packets from a preceding connection being interpreted as part of a current connection. Maintaining TIME_WAIT_2 uses up kernel memory on the server. DNS ...
How to know what the 'errno' means?
...errno));
}
Linux also supports the explicitly-threadsafe variant strerror_r().
share
|
improve this answer
|
follow
|
...
How to empty/destroy a session in rails?
...
To clear the whole thing use the reset_session method in a controller.
reset_session
Here's the documentation on this method: http://api.rubyonrails.org/classes/ActionController/Base.html#M000668
Resets the session by clearing out all
the objects stored ...
What is the difference between 'typedef' and 'using' in C++11?
...;
template <typename U> struct bar { typename rebind<U>::type _var_member; }
But using syntax simplifies this use case.
template <typename T> using my_type = whatever<T>;
my_type<int> variable;
template <typename U> struct baz { my_type<U> _var_member; ...
Detecting taps on attributed text in a UITextView in iOS
...UITapGestureRecognizer(target: self, action: #selector(myMethodToHandleTap(_:)))
tap.delegate = self
textView.addGestureRecognizer(tap)
}
@objc func myMethodToHandleTap(_ sender: UITapGestureRecognizer) {
let myTextView = sender.view as! UITextView
let layou...
Pull to refresh UITableView without UITableViewController
...reshControl()
refreshControl.addTarget(self, action: #selector(refresh(_:)), for: .valueChanged)
if #available(iOS 10.0, *) {
tableView.refreshControl = refreshControl
} else {
tableView.backgroundView = refreshControl
}
}
@objc func refresh(_ refreshControl: UIRefr...
Using isKindOfClass with Swift
...icker' in the subsequent 'if' block, then you would want to use: if let _ = touch.view as? UIPickerView { ... }
– Adam Freeman
Nov 7 '15 at 0:38
...
How can you check which options vim was compiled with?
...n without GUI. Features included (+) or not (-):
-arabic +autocmd -balloon_eval -browse +builtin_terms +byte_offset +cindent
-clientserver -clipboard +cmdline_compl +cmdline_hist +cmdline_info +comments
-conceal +cryptv +cscope +cursorbind +cursorshape +dialog_con +diff +digraphs
-dnd -ebcdic -e...
How can I efficiently select a Standard Library container in C++11?
...ecause list is not such a good container in general, and neither is forward_list. Both lists are very specialized containers for niche applications.
To build such a chart, you just need two simple guidelines:
Choose for semantics first
When several choices are available, go for the simplest
Wor...
Map enum in JPA with fixed values?
...ic implementation, tweak it as required):
@Entity
@Table(name = "AUTHORITY_")
public class Authority implements Serializable {
public enum Right {
READ(100), WRITE(200), EDITOR (300);
private int value;
Right(int value) { this.value = value; }
public int ...