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Checking if a SQL Server login already exists
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In order to hande naming conflict between logins, roles, users etc. you should check the type column according to Microsoft sys.database_principals documentation
In order to handle special chacters in usernames etc, use N'<na...
Difference between Eclipse Europa, Helios, Galileo
...d how the names of the last three and the next release are in alphabetical order (Galileo, Helios, Indigo, Juno)? This is probably how they will go in the future, in the same way that Ubuntu release codenames increase alphabetically (note Indigo is not a moon of Jupiter!).
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XPath to select Element by attribute value
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Finding all possible combinations of numbers to reach a given sum
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To be as useful as possible, the code should return a List[List[Int]]in order to allow getting the number of solution (length of the list of lists), the "best" solution (the shortest list), or all the possible solutions.
Here is an example. It is very inefficient, but it is easy to understand.
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Java 8 Streams: multiple filters vs. complex condition
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Interesting - when I change the order to run test2 BEFORE test1, test1 runs slightly slower. It's only when test1 runs first that it seems faster. Can anyone reproduce this or have any insights?
– Sperr
Aug 4 '17 at 20...
SQL Server query - Selecting COUNT(*) with DISTINCT
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string.split - by multiple character delimiter
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Calling C++ class methods via a function pointer
...ference for (think virtual functions). You also need to know the object in order to provide the this implicit parameter, of course.
Having said that you need them, now I'll say that you really need to avoid them. Seriously, member pointers are a pain. It is much more sane to look at object-oriented...
What is the difference between a weak reference and an unowned reference?
...old on the referred object (a.k.a. they don't increase the retain count in order to prevent ARC from deallocating the referred object).
But why two keywords? This distinction has to do with the fact that Optional types are built-in the Swift language. Long story short about them: optional types offe...
What is a sealed trait?
...ed tree, for instance. You can write this:
sealed abstract class Tree[T : Ordering]
but you cannot do this:
sealed trait Tree[T : Ordering]
since context bounds (and view bounds) are implemented with implicit parameters. Given that traits can't receive parameters, you can't do that.
Personall...