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Why does C++ compilation take so long?
...mmon headers get processed over and over again. That's O(N^2) worst-case, vs. most other languages O(N) parsing time.
– Tom
Dec 7 '08 at 7:05
12
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C# generic type constraint for everything nullable
... this check, you're going to have to trade-off the cost of a runtime check vs. the unhandiness of exceptions in a static constructor. Since you're really implementing a poor-mans static analyzer here, this exception should never be thrown except during development. Finally, even if you want to avoi...
How do I remove a submodule?
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community wiki
19 revs, 13 users 47%John Douthat
413
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Are PHP short tags acceptable to use?
...e any of the other features that might not be supported on a server? MYSQL vs MYSQLI? You will waste your time little by little, again and again writing long tags just to avoid a tiny chance of spending a little time to change to a better host.
– Dean Or
Jun 28...
Check if pull needed in Git
...(git rev-parse HEAD) == $(git rev-parse @{u})
(Note: the benefit of this vs. previous answers is that you don't need a separate command to get the current branch name. "HEAD" and "@{u}" (the current branch's upstream) take care of it. See "git rev-parse --help" for more details.)
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When to use Common Table Expression (CTE)
... from #tmp A inner join #tmp B ON A.number = B.number+1 group by A.number vs with CTE AS (select top 100 * from master..spt_values order by 1,2,3,4) select A.number, COUNT(*) from CTE A inner join CTE B ON A.number = B.number+1 group by A.number
– RichardTheKiwi
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C#: Raising an inherited event
... Official guidelines: msdn.microsoft.com/en-us/library/w369ty8x(VS.80).aspx
– meandmycode
Apr 16 '09 at 14:17
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How to replace plain URLs with links?
...hen it comes to parsing URLs: international domain names, actual (.museum) vs. nonexistent (.etc) TLDs, weird punctuation including parentheses, punctuation at the end of the URL, IPV6 hostnames etc.
I've looked at a ton of libraries, and there are a few worth using despite some downsides:
Soapbo...
Why are trailing commas allowed in a list?
...pler to define the grammar that way? ;) Compare List = "[" {Item ","} "]". vs. List = "[" ({Item","}Item|)"]".
– Voo
Jul 22 '12 at 12:41
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What is the difference between a heuristic and an algorithm?
... the same answer, is called deterministic.
(note 2): This is called the P vs NP problem, and problems that are classified as NP-complete and NP-hard are unlikely to have an 'efficient' algorithm. Note; as @Kriss mentioned in the comments, there are even 'worse' types of problems, which may need exp...