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Why are arrays of references illegal?
...question about standard I can cite the C++ Standard §8.3.2/4:
There shall be no references to references, no arrays of references, and no pointers to references.
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Why does C++ not have reflection?
...nt:
C++ makes very few guarantees
about the compiled code. The
compiler is allowed to do pretty
much anything it likes, as long as
the resulting functionality is what
is expected. For example, your
classes aren't required to actually
be there. The compiler can optimize them away, inline
everything t...
Why is it impossible to build a compiler that can determine if a C++ function will change the value
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@mrsoltys, quantum computers are "only" exponentially faster for some problems, they can not solve undecidable problems.
– zch
Jul 1 '13 at 18:52
8
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Unstaged changes left after git reset --hard
... It's the * text=auto directive in the gitattributes file. It automatically changes file endings, so the files will automatically be marked as "modified" when you check the status.
– Cody Django
Feb 19 '15 at 22:24
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Why is the .bss segment required?
...Imagine that your C program runs on an embedded system, where the code and all constants are saved in true ROM (flash memory). In such systems, an initial "copy-down" must be executed to set all static storage duration objects, before main() is called. It will typically go like this pseudo:
for(i=0...
Reference alias (calculated in SELECT) in WHERE clause
...probably consider a computed column (and perhaps persisted) instead, especially if a lot of queries refer to this same expression.
PS your fears seem unfounded. In this simple example at least, SQL Server is smart enough to only perform the calculation once, even though you've referenced it twice. ...
Recursively list all files in a directory including files in symlink directories
... directories
/dir/dir11 , /dir/dir12 , and /dir/dir13 . I want to list all the files in dir including the ones in dir11 , dir12 and dir13 .
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How to drop rows of Pandas DataFrame whose value in a certain column is NaN
...ta, including dropna(), is built into pandas explicitly. Aside from potentially improved performance over doing it manually, these functions also come with a variety of options which may be useful.
In [24]: df = pd.DataFrame(np.random.randn(10,3))
In [25]: df.iloc[::2,0] = np.nan; df.iloc[::4,1] ...
Git for beginners: The definitive practical guide
...repository.
cd ~/code/project001/
rm -rf .git/
Caution: This will destroy all revision history, all your tags, everything git has done. It will not touch the "current" files (the files you can currently see), but previous changes, deleted files and so on will be unrecoverable!
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How do I remove all HTML tags from a string without knowing which tags are in it?
Is there any easy way to remove all HTML tags or ANYTHING HTML related from a string?
3 Answers
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