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What does the [Flags] Enum Attribute mean in C#?
...mentation of your enum uses Flags, and so does Enum.IsDefined, Enum.Parse, etc. Try to remove Flags and look at the result of MyColor.Yellow | MyColor.Red; without it you get "5", with Flags you get "Yellow, Red". Some other parts of the framework also use [Flags] (e.g., XML Serialization).
...
Differences between hard real-time, soft real-time, and firm real-time?
...ions such as pacemakers, a large number of defense applications, avionics, etc.
Firm/soft real time systems can miss some deadlines, but eventually performance will degrade if too many are missed. A good example is the sound system in your computer. If you miss a few bits, no big deal, but miss t...
Laravel Eloquent ORM Transactions
...out: 1. You need to add "use DB;" to do this e.g. at the top of your model file 2. Unlike JS, you don't get access to local variables in the parent scope unless you explicitly pass them in, you need to add the "use" construct thusly... DB::transaction(function() use ($user) { ...stuffs referencing $...
Checking if an Android application is running in the background
...es=orientation|screensize (| with anything else you want) in your manifest file and handle the configuration changes, or else your activity will be destroyed and recreated. If you do not set this, your activity's methods will be called in this order: onCreate -> onStart -> onResume -> (now ...
DESTDIR and PREFIX of make
...ge will go when it is installed, and where it will look for its associated files when it is run. It's what you should use if you're just compiling something for use on a single host.
make install DESTDIR=***
Number 2 is for installing to a temporary directory which is not where the package w...
data.table vs dplyr: can one do something well the other can't or does poorly?
...st of the features here and also in this post. In addition:
fread - fast file reader has been available for a long time now.
fwrite - a parallelised fast file writer is now available. See this post for a detailed explanation on the implementation and #1664 for keeping track of further developments...
Setting the zoom level for a MKMapView
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You can get the .m and .h file, add it to your project, then reference it in your map view controller, and use it as if it were a method on MKMapView, oh the joys of categories!
– PostMan
Nov 15 '10 at 22:55
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How to update npm
...chpad.net/chris-lea/node.js/ubuntu bionic Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. for Ubuntu 18.04
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Http长连接200万尝试及调优 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...控最大连接数。
服务端还需要调整一下系统的参数，在/etc/sysctl.conf中：
net.core.somaxconn = 2048
net.core.rmem_default = 262144
net.core.wmem_default = 262144
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 4096 16777216 ...
Android emulator and virtualbox cannot run at same time
...me>\AppData\Local\Android\sdk\extras
In that directory is some kind of file like intelhaxm-android.exe. Run it.
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