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What does “Protocol … can only be used as a generic constraint because it has Self or associated typ
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Oh no wait it does, because Dictionary needs to be able to know if a given object is indeed the correct key, because it's possible for two different objects to generate the same hash code. Hmm, that is a bit tricky. So the problem here is ...
Regex (grep) for multi-line search needed [duplicate]
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/bin/grep: PCRE does not support \L, \l, \N, \U, or \u
– Oli
Sep 5 '11 at 8:14
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Make xargs execute the command once for each line of input
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@Wernight: "-n1" does not give 1 invocation per input line. maybe your input line was too long. demo: echo "foo bar" | xargs -n1 echo. hence if you pipe in stuff like 'ls', it won't handle spaces well.
– gatoatigrado
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More elegant “ps aux | grep -v grep”
...nal'
This will match lines containing terminal, which egrep '[t]erminal' does not! It also works on many flavours of Unix.
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When does ADT set BuildConfig.DEBUG to false?
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It doesn't work properly:
Issue 27940: BuildConfig.DEBUG is "true" for exported application package
It's disappointing that they sometimes release buggy features.
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Why must we define both == and != in C#?
...nequality (left : Foo, right : Foo) = left.Prop <> right.Prop
This does exactly what it looks like. It creates an equality comparer on == only, and checks to see if the internal values of the class are equal.
While you can't create a class like this in C#, you can use one that was compiled...
Why does (0 < 5 < 3) return true?
... the language (Javascript) that true is cast to 1, but that the programmer does not in general view 1 and true (and 0 and false) as the same thing.
If however you have a mental model of 1 being true and 0 being false, then it leads to all sorts of nice boolean techniques that are extremely useful...
What is the difference between URI, URL and URN? [duplicate]
...nism for retrieving it. A URL defines how the resource can be obtained. It does not have to be HTTP URL (http://), a URL can also be (ftp://) or (smb://).
A Uniform Resource Name (URN) is a Uniform Resource Identifier (URI) that uses the URN scheme, and does not imply availability of the identified...
Does MySQL foreign_key_checks affect the entire database?
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Does setting the foreign_key_checks on each request costly? I've got a script to upgrade the DB and I wouldn't want anybody else to be able to override the foreign key checks by default during that upgrade. So I'd make millio...
Normalization in DOM parsing with java - how does it work?
...node with newlines displayed would look like: "Hello\nwor\nld" Normalizing does not remove newlines.
– Christian
Mar 22 '15 at 19:09
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