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How large should my recv buffer be when calling recv in the socket library
... It doesn't really matter too much. If your protocol is a transactional / interactive one just pick a size that can hold the largest individual message / command you would reasonably expect (3000 is likely fine). If your protocol is transferring bulk data, then larger buffers can be more efficient...
How does one make random number between range for arc4random_uniform()?
... removal of toIntMax() in Swift 4, we now have to use a different means of converting to a common integer type. In this example I'm using Int64 which is large enough for my purposes, but if you're using unsigned integers or have an Int128 or Int256 custom type you should use those.
public func rand...
How to get the number of Characters in a String?
...?"
???????????? alone is one grapheme, but, from unicode to code points converter, 4 runes:
????: women (1f469)
dark skin (1f3fe)
ZERO WIDTH JOINER (200d)
????red hair (1f9b0)
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How to change colors of a Drawable in Android?
...wable that I'm loading up from a source image. On this image, I'd like to convert all of the white pixels to a different color, say blue, and then cache the resultant Drawable object so I can use it later.
...
Hidden Features of C++? [closed]
...e type (i.e. no defaulted arguments) function1 and function2 are implictly converted to function pointers, and the result is implicitly converted back.
– MSalters
Nov 12 '10 at 15:49
...
Convenient C++ struct initialisation
... @max: It will prevent it only if the types differ (even if they are convertible to each other), which is the OP situation. If it cannot distinguish the types, then of course it doesn't work, but that's a whole other question.
– Matthieu M.
Oct 13 '17 at ...
Recursive lambda functions in C++11
...0);
}
Trick here is that lambdas can access static variables and you can convert stateless ones to function pointer.
You can use it with standard lambdas:
void g()
{
int sum;
auto rec = [&sum](int i) -> int
{
static int (*inner)(int&, int) = [](int& _sum, int i...
Linq: adding conditions to the where clause conditionally
...ses are optionally attached to it. The final Select is optional. I use to convert the database rows objects into result "Fruit" objects.
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Hashing a file in Python
...pisti points out, we gotta deal with those bigger files in chunks!
import sys
import hashlib
# BUF_SIZE is totally arbitrary, change for your app!
BUF_SIZE = 65536 # lets read stuff in 64kb chunks!
md5 = hashlib.md5()
sha1 = hashlib.sha1()
with open(sys.argv[1], 'rb') as f:
while True:
...
How do I calculate tables size in Oracle
..._rows*avg_row_len)/(1024*1024)) MB
from all_tables
where owner not like 'SYS%' -- Exclude system tables.
and num_rows > 0 -- Ignore empty Tables.
order by MB desc -- Biggest first.
;
--Tables + Rows
select owner, table_name, num_rows
from all_tables
where owner not like 'SYS%' -- Exclude...