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What is a segmentation fault?
...d it may lead to segfault in a more complex use case, where other function calls might lead the stack to grow and contain the data pointed to by the dangling pointer. writing to that data (local vars) would lead to undefined behavior (segfault &Co)
– Ayman Khamouma
...
Return value in a Bash function
...at should provide data cannot also echo other stuff to stdout, because the caller using $() will receive that too and get confused or have to parse the output. Global variables are not great because it's just a matter of time before you use the same global var in two places that happen to be nested ...
How do I get the result of a command in a variable in windows?
...
IF NOT "%1"=="" GOTO ADDV
SET VAR=
FOR /F %%I IN ('DIR *.TXT /B /O:D') DO CALL %0 %%I
SET VAR
GOTO END
:ADDV
SET VAR=%VAR%!%1
:END
All output lines are stored in VAR separated with "!".
@John: is there any practical use for this? I think you should watch PowerShell or any other programming lan...
Getting the name of a variable as a string
...rst print gives test, the print in the loop raises VarnameRetrievingError: Callee's node cannot be detected.
– Tillus
Jul 17 at 10:14
...
When would you use delegates in C#? [closed]
... I use delegates for:
Event handlers (for GUI and more)
Starting threads
Callbacks (e.g. for async APIs)
LINQ and similar (List.Find etc)
Anywhere else where I want to effectively apply "template" code with some specialized logic inside (where the delegate provides the specialization)
...
How do I iterate through each element in an n-dimensional matrix in MATLAB?
...st assume you have a function that you want to apply to each element of A (called my_func). You first create a function handle to this function:
fcn = @my_func;
If A is a matrix (of type double, single, etc.) of arbitrary dimension, you can use arrayfun to apply my_func to each element:
outArgs ...
Using boolean values in C
...has the benefit of being standardized.
Whatever the boolean constants are called, use them only for initialization. Never ever write something like
if (ready == TRUE) ...
while (empty == FALSE) ...
These can always be replaced by the clearer
if (ready) ...
while (!empty) ...
Note that these...
Why does the order of the loops affect performance when iterating over a 2D array?
...ches. Data from your memory gets brought over to the CPU in little chunks (called 'cache lines'), typically 64 bytes. If you have 4-byte integers, that means you're geting 16 consecutive integers in a neat little bundle. It's actually fairly slow to fetch these chunks of memory; your CPU can do a lo...
How to find index of list item in Swift?
...ex(where: {$0 === person1})
Swift 4 / Swift 3 - the function used to be called index
Swift 2 - the function used to be called indexOf
* Note the relevant and useful comment by paulbailey about class types that implement Equatable, where you need to consider whether you should be comparing usin...
Split array into chunks
...ove is a not-that-elegant (in my mind) workaround to use Array.map. It basically does the following, where ~ is concatenation:
[[1,2,3]]~[]~[]~[] ~ [[4,5,6]]~[]~[]~[] ~ [[7]]
It has the same asymptotic running time as the method below, but perhaps a worse constant factor due to building empty lis...