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What is the point of function pointers?
...at takes its sorting criterion as a pointer to a comparison function.
In C++, this is often done using function objects (also called functors). These are objects that overload the function call operator, so you can call them as if they were a function. Example:
class functor {
public:
voi...
What is the difference between new/delete and malloc/free?
...he language concept known as "heap" or the os concept of "processes heap". C++ is deliberately defined to be Platform/OS/Compiler neutral. So using a specific OS concept like "processes heap" would undermine the flexibility of the standard.
– Martin York
Feb 21...
Detect and exclude outliers in Pandas data frame
...u would do in numpy.array
df = pd.DataFrame({'Data':np.random.normal(size=200)})
# example dataset of normally distributed data.
df[np.abs(df.Data-df.Data.mean()) <= (3*df.Data.std())]
# keep only the ones that are within +3 to -3 standard deviations in the column 'Data'.
df[~(np.abs(df.Data-...
Fastest way to check if a file exist using standard C++/C++11/C?
I would like to find the fastest way to check if a file exist in standard C++11, C++, or C. I have thousands of files and before doing something on them I need to check if all of them exist. What can I write instead of /* SOMETHING */ in the following function?
...
Tools to search for strings inside files without indexing [closed]
... fast, lean and it is free.
Tested on Windows 7, 8, 10 and Windows Server 2008 R2.
Allows regular expressions.
AstroGrep is a Microsoft Windows GUI File Searching (grep) utility. Its features include regular expressions, versatile printing options, stores most recent used paths and has a "con...
Best practices for circular shift (rotate) operations in C++
Left and right shift operators (>) are already available in C++.
However, I couldn't find out how I could perform circular shift or rotate operations.
...
How do you iterate through every file/directory recursively in standard C++?
How do you iterate through every file/directory recursively in standard C++?
16 Answers
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What is InnoDB and MyISAM in MySQL?
...ng WHERE customer_id = 10233276;
3 UPDATE checking SET balance = balance - 200.00 WHERE customer_id = 10233276;
4 UPDATE savings SET balance = balance + 200.00 WHERE customer_id = 10233276;
5 COMMIT;
Suppose, the process crashes at step 4. If a InnoDB table was used here, a rollback would undo the...
What is the optimal algorithm for the game 2048?
...ed @nneonneo highly optimized infrastructure and implemented my version in C++. This version allows for up to 100000 runs per move and even 1000000 if you have the patience. Building instructions provided. It runs in the console and also has a remote-control to play the web version.
(source)
Result...
Why aren't pointers initialized with NULL by default?
...Or under other conditions the variable is potentially never used. A lot of C++ developers would scream foul under both conditions at the cost of that extra instruction.
It's not just about time. But also space. There are a lot of environments where both resources are at a premium and the developers...