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Understanding ibeacon distancing
...curacy. Following URLs to start with: http://en.wikipedia.org/wiki/Standard_error, http://en.wikipedia.org/wiki/Uncertainty
In physical world, when you make some measurement, you always get different results (because of noise, distortion, etc) and very often results form Gaussian distribution. Ther...
Detect if the app was launched/opened from a push notification
...pplication wake up most recently?
func applicationWillEnterForeground(_ application: UIApplication) {
// time stamp the entering of foreground so we can tell how we got here
wakeTime = Date()
}
func application(_ application: UIApplication, didReceiveRemoteNotification userIn...
What happens if you static_cast invalid value to enum class?
... to the enumeration type, no value in data[0] can lead to UB for the static_cast.
After CWG 1766 (C++17)
See CWG defect 1766.
The [expr.static.cast]p10 paragraph has been strengthened, so you now can invoke UB if you cast a value that is outside the representable range of an enum to the enum type. ...
Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
...
Following command resolved my issue:
sudo chown -R _mysql:mysql /usr/local/var/mysql
sudo mysql.server start
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What does template mean?
...
template<void (*F)()>
struct FunctionWrapper {
static void call_it() { F(); }
};
// pass address of function do_it as argument.
void do_it() { }
FunctionWrapper<&do_it> test;
Template reference parameter (passing an integer)
template<int &A>
struct SillyExample {
...
底部提示条使用指导 · App Inventor 2 中文网
...Duration 为 0 时持续显示，适合网络断开提示。
when 按钮_显示.Click() {
底部提示条1.Duration = 0
底部提示条1.Show("网络连接已断开")
}
when 按钮_关闭.Click() {
底部提示条1.Dismiss()
}
提示条叠在当前界面上，不会替你重试业务操作...
What's the idiomatic syntax for prepending to a short python list?
...
If you can go the functional way, the following is pretty clear
new_list = [x] + your_list
Of course you haven't inserted x into your_list, rather you have created a new list with x preprended to it.
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Better way to get type of a Javascript variable?
...
If your type naming contains : or _ you may extend this regex to match(/\s([a-z,_,:,A-Z]+)/)
– masi
Jun 20 '14 at 16:58
6
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How to use a servlet filter in Java to change an incoming servlet request url?
...ress bar).
Register the filter in web.xml on an url-pattern of /* or /Check_License/*, depending on the context path, or if you're on Servlet 3.0 already, use the @WebFilter annotation for that instead.
Don't forget to add a check in the code if the URL needs to be changed and if not, then just ca...
Parse usable Street Address, City, State, Zip from a string [closed]
...nteger = 0 To streetMarkerIndex
If IsNumeric(splitString(counter)) _
Or splitString(counter).ToString.ToLower = "po" _
Or splitString(counter).ToString().ToLower().Replace(".", "") = "po" Then
addressIndex = counter
Exit For
End If
...