大约有 23,000 项符合查询结果（耗时：0.0410秒） [XML]
What are the differences between poll and select?
...t poll() not being available on BSD still apply? MacOS X (which is partly based on BSD) has poll(), and the POSIX standard (POSIX 2008) requires it.
– Jonathan Leffler
Mar 10 '10 at 20:49
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MAC addresses in JavaScript
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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How to safely open/close files in python 2.4
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How should the ViewModel close the form?
...:
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
MainWindow window = new MainWindow();
var viewModel = new MainWindowViewModel();
viewModel.RequestClose += window.Close;
window.DataContext = viewModel;
window.Show...
Maximum number of characters using keystrokes A, Ctrl+A, Ctrl+C and Ctrl+V
...68160001953743683783272702066311903448533894049486008426303248121757146615064636953144900245
174442911064952028008546304
50,000 => a very large number!
I agree with @SB that you should always state your assumptions: Mine is that you don't need to paste twice to double the number of characters. ...
Declaring variables inside or outside of a loop
...performance requirements instead of having to go all over your entire code base and tweak and hack things in order to squeeze clock cycles here and there.
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How to use SCNetworkReachability in Swift
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Swift 3, IPv4, IPv6
Based on the Martin R's answer:
import SystemConfiguration
func isConnectedToNetwork() -> Bool {
guard let flags = getFlags() else { return false }
let isReachable = flags.contains(.reachable)
let needsConnec...
redirect COPY of stdout to log file from within bash script itself
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I made some little "sourceable" scripts based on this. Can use them in a script like . log or . log foo.log: sam.nipl.net/sh/log sam.nipl.net/sh/log-a
– Sam Watkins
Jul 16 '15 at 3:22
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Add a space (“ ”) after an element using :after
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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Which are more performant, CTE or temporary tables?
...Notice in the plan above there is no mention of CTE1. It just accesses the base tables directly and is treated the same as
SELECT A,
ABS(B) AS Abs_B,
F
FROM T
WHERE A = 780
Rewriting by materializing the CTE into an intermediate temporary table here would be massively counter pr...