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How to check iOS version?
...eck if UIPopoverController is available on the current device using NSClassFromString:
if (NSClassFromString(@"UIPopoverController")) {
// Do something
}
For weakly linked classes, it is safe to message the class, directly. Notably, this works for frameworks that aren't explicitly linked as "...
What does the brk() system call do?
...sh immediately.
I'm not sure where the number 512GB in this diagram comes from. It implies a 64-bit virtual address space, which is inconsistent with the very simple memory map you have there. A real 64-bit address space looks more like this:
Legend: t: text, d: data, b: BSS
T...
How to detect page zoom level in all modern browsers?
...w it's an even bigger mess than it was when this question was first asked. From reading all the responses and blog posts I could find, here's a summary. I also set up this page to test all these methods of measuring the zoom level.
Edit (2011-12-12): I've added a project that can be cloned: https:/...
Brew doctor says: “Warning: /usr/local/include isn't writable.”
...
Take ownership of it and everything in it.
Mac OS High Sierra or newer: (ty to Kirk in the comments below)
$ sudo chown -R $(whoami) $(brew --prefix)/*
Previous versions of macos:
$ sudo chown -R $USER:admin /usr/local/include
Then do anot...
Failed to install Python Cryptography package with PIP and setup.py
...on through either pip install cryptography or by downloading the package from their site and running python setup.py , I get the following error:
...
How to find serial number of Android device?
...VICE);
String uid = tManager.getDeviceId();
getSystemService is a method from the Activity class. getDeviceID() will return the MDN or MEID of the device depending on which radio the phone uses (GSM or CDMA).
Each device MUST return a unique value here (assuming it's a phone). This should wor...
Greenlet Vs. Threads
... of threads is instead appropriate. Here is a more reasonable comparison (from my reddit post in response to people citing this SO post).
import gevent
from gevent import socket as gsock
import socket as sock
import threading
from datetime import datetime
def timeit(fn, URLS):
t1 = datetim...
Difference between static and shared libraries?
...me. A program using a static library takes copies of the code that it uses from the static library and makes it part of the program. [Windows also has .lib files which are used to reference .dll files, but they act the same way as the first one].
There are advantages and disadvantages in each metho...
Strengths of Shell Scripting compared to Python [closed]
... or more additional processes, wasting time and memory.
Running programs from the shell, redirecting stderr to a log file and that kind of thing is good. Do that in the shell.
Almost everything else can be done more efficiently and more clearly as a Python script.
You need both. However, you s...
Determining 32 vs 64 bit in C++
...lt;sizeof(size_t)>(); }
int main()
{
// appropriate function will be selected at compile time
DoMyOperation();
return 0;
}
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