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Makefile variable as prerequisite
...-hostname: guard-HOSTNAME
./changeHostname.sh ${HOSTNAME}
If you call make change-hostname, without adding HOSTNAME=somehostname in the call, then you'll get an error, and the build will fail.
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How much faster is C++ than C#?
... more advanced JIT optimizations being complicated to implement, and the really cool ones are only arriving just now.
So C++ is faster, in many cases. But this is only part of the answer. The cases where C++ is actually faster, are highly optimized programs, where expert programmers thoroughly opti...
How to work around the lack of transactions in MongoDB?
...iewpoint (I have only worked with SQL databases so far), or whether it actually can't be done.
10 Answers
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Most efficient T-SQL way to pad a varchar on the left to a certain length?
...ecause you are dealing with a fixed length).
But as I said you should really avoid doing this in your database.
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Why should I declare a virtual destructor for an abstract class in C++?
...structor when deleting a pointer to a base class.
– j_random_hacker
Feb 10 '09 at 10:10
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ADB Android Device Unauthorized
Since I reinstalled Eclipse (simply deleted and downloaded it again) I can't debug my applications on Samsung Galaxy i9001 (with CyanogenMod - Android 4.4.2). It worked fine before reinstallation.
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Split comma-separated strings in a column into separate rows
...solution,
and two additional variants of Jaap's data.table methods.
Overall 8 different methods were benchmarked on 6 different sizes of data frames using the microbenchmark package (see code below).
The sample data given by the OP consists only of 20 rows. To create larger data frames, these 20...
URLEncoder not able to translate space character
... @congliu that's incorrect - you're probably thinking of replaceAll() which works with regex - replace() is simple character sequence replacement.
– CupawnTae
Sep 25 '13 at 13:57
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What is the difference between integration and unit tests?
I know the so-called textbook definition of unit tests and integration tests. What I am curious about is when it is time to write unit tests... I will write them to cover as many sets of classes as possible.
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Best way to convert string to bytes in Python 3?
...ferent ways:
If it is a string, you must also give the encoding (and optionally, errors) parameters; bytearray() then converts the string to bytes using str.encode().
If it is an integer, the array will have that size and will be initialized with null bytes.
If it is an object conforming to the buff...