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What is meant by Ems? (Android TextView)
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android:ems or setEms(n) sets the width of a TextView to fit a text of n 'M' letters regardless of the actual text extension and text size. See wikipedia Em unit
but only when the layout_width is set to "wrap_content". Other layo...
How to escape a pipe char in a code statement in a markdown table?
... As of March 2019, in Gitlab Wikis, you still need to use "|" inside the markup code.
– knb
Mar 22 '19 at 13:52
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Get Unix Epoch Time in Swift
...you have to account for networking delays and check for connectivity. I decided to just use Foundation...
– Chase Roberts
Dec 9 '16 at 20:23
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Getting Git to work with a proxy server - fails with “Request timed out”
...st step of pablolic's instructions (ie adding http.proxy to the git config file). That was all it took for me.
– Simon Tewsi
Jan 11 '13 at 3:41
3
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Mixins vs. Traits
...define instance variables. Traits do not allow this. The state must be provided by composing class (=class using the traits)
ad 2.
There may be the name conflict. Two mixins (MA and MB) or traits (TA and TB) define method with the same definition foo():void.
Mixin MA {
foo():void {
pri...
git: difference between “branchname” and “refs/heads/branchname”
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See, branchName needs to be fully resolved before GIT can actually identify it. The fully resolved name will be refs/heads/branchName.
One of the famous commandsgit checkout branchName actually automatically resolves it fully to identify where you want to checkout. Note that it does it aut...
Order of member constructor and destructor calls
...ed. The reason is that one object may use another, thus depend on it. Consider:
struct A { };
struct B {
A &a;
B(A& a) : a(a) { }
};
int main() {
A a;
B b(a);
}
If a were to destruct before b then b would hold an invalid member reference. By destructing the objects in the rev...
MySQL CONCAT returns NULL if any field contain NULL
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For those wonder, as I did, what the COALESCE function does: it returns the first non-NULL value parameter passed to it (or NULL if all parameters are NULL). By passing an empty string as the second parameter, you are guaranteeing it will not return...
Possible reasons for timeout when trying to access EC2 instance
...group or... Nope, just SSH into the new DNS. And update your ~/.ssh/config file if you have to!
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What is an index in SQL?
... a PRIMARY KEY which in some storage engines defines where in the database file the value is stored.
In MySQL you can use EXPLAIN in front of your SELECT statement to see if your query will make use of any index. This is a good start for troubleshooting performance problems. Read more here:
http://...