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What is “lifting” in Scala?
...Stream[A]]. This can be converted to the monad transformer StreamT[IO, A]. Now you may wish to "lift" some other value an IO[B] perhaps to that it is also a StreamT. You could either write this:
StreamT.fromStream(iob map (b => Stream(b)))
Or this:
iob.liftM[StreamT]
this begs the question:...
Why does the order in which libraries are linked sometimes cause errors in GCC?
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(See the history on this answer to get the more elaborate text, but I now think it's easier for the reader to see real command lines).
Common files shared by all below commands
$ cat a.cpp
extern int a;
int main() {
return a;
}
$ cat b.cpp
extern int b;
int a = b;
$ cat d.cpp
int b;
L...
What is the difference between a web API and a web service?
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Not "absolutely the same" if there are restrictions now are they?
– Ojonugwa Jude Ochalifu
Feb 6 '18 at 15:53
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Select columns from result set of stored procedure
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It also doesn't work when you don't know the table definition
– Ian Boyd
Nov 10 '10 at 15:09
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Design Patterns: Factory vs Factory method vs Abstract Factory
...ch concrete implementation it is getting.
Factory Method: Client doesn't know what concrete classes it will be required to create at runtime, but just wants to get a class that will do the job.
AbstactFactory: When your system has to create multiple families of products or you want to provide a l...
Can I disable autolayout for a specific subview at runtime?
... Thanks, man. I'm in my second day struggling with this issue and now it works!
– apostolov
Jan 21 '16 at 16:00
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Computed / calculated / virtual / derived columns in PostgreSQL
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The functionality is in development right now: commitfest.postgresql.org/16/1443
– r90t
Jan 23 '18 at 12:42
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How to rsync only a specific list of files?
...the content of the file rsync-src-files which I will elaborate down below. Now, if you want to use the latter version, you need to keep in mind the following four remarks:
Notice one needs to specify both --files-from and the source directory
One needs to explicitely specify --recursive.
The file...
Download data url file
...st calling a.click() directly would not work but it worket with the event. Now they both work.
– Zibri
Mar 17 '19 at 9:48
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Getting time elapsed in Objective-C
...ate];
// do stuff...
NSTimeInterval timeInterval = [start timeIntervalSinceNow];
timeInterval is the difference between start and now, in seconds, with sub-millisecond precision.
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